ImageryLayer

AMD: require(["esri/layers/ImageryLayer"], (ImageryLayer) => { /* code goes here */ });
ESM: import ImageryLayer from "@arcgis/core/layers/ImageryLayer";
Class: esri/layers/ImageryLayer
Inheritance: ImageryLayer Layer Accessor
Since: ArcGIS Maps SDK for JavaScript 4.0

Represents a dynamic image service resource as a layer. An ImageryLayer retrieves and displays data from dynamic image services. An image service supports accessing the mosaicked image, its catalog, and the individual rasters in the catalog. An image service supports dynamic access and tiled access. Dynamic access provides more functionalities, and tiled access provides faster and more scalable access to precooked tiles.

layers-imagery

If the image service is requested from a different domain, a CORS enabled server or a proxy is required.

Esri requires that when you use an ArcGIS Online basemap in your app, the map must include Esri attribution and you must be licensed to use the content. For detailed guidelines on working with attribution, please visit the official attribution in your app documentation. For information on terms of use, see the Terms of Use FAQ.

ImageryLayer rendering

ImageryLayer can be rendered on the server or on the client. This section talks about different approaches you can take when rendering an ImageryLayer in your application.

Applying renderingRule

Image service supports dynamic processing which can be applied through the layer’s renderingRule property. A rendering rule defines how the requested image should be rendered or processed. You can process images using raster functions published with the image service. You can also use well-known raster functions, such as the hillshade function for elevation data, the stretch function for multispectral data, and the colormap function for thematic data. When renderingRule is applied to the layer, the network request is made to the server for the image to be processed.

Applying renderer

ImageryLayer supports various renderers. By default, an ImageryLayer uses server side rendering. ImageryLayer parses a renderer specified by a user and leverages a renderingRule specified by the server or the user to achieve the expected rendering for the images. The server processes and renders the ImageryLayer and returns a ready-to-draw jpg or png image to the client.

When an ImageryLayer is created with lerc format, the client gets access to the raw data which can be used for client-side analysis and rendering. A default renderer that leverages available imagery information is applied to an ImageryLayer with lerc format if the pixelFilter function is not specified. The user can change this default renderer on the client-side by applying a renderer or pixelFilter. The pixelFilter is a good alternative if the existing renderers do not meet your requirements. If both renderer and pixelFilter are applied to the layer then the pixelFilter will take priority and its logic will be applied.

Applying pixelFilter

The pixelFilter can be used to colorize raw image pixels when ImageryLayer's format is set to lerc. It is a function that processes the pixelData. The pixelData object contains a pixelBlock property that gives you access to all of the pixels in the raster on the client. Inside the pixelFilter you may loop through all the pixels and process them. This function is a useful alternative if the existing renderers do not meet your requirements, because it gives you control over how to color image pixels. If both a renderer and pixelFilter are applied to the layer then the pixelFilter will take priority and its logic will be applied.

Working with multidimensional raster data

Multidimensional data is commonly used in the scientific community to store atmospheric, oceanographic, and earth science data. Temperature, humidity, wind speed, and direction are all examples of the data that can be stored as variables in a multidimensional array. As illustrated in the graphic below, multidimensional data can show sea temperature (variable) for a specific area at multiple time and depth dimensions. This information is stored as slices, where the service has a slice for each unique combination of dimension values and variable names.

layers-imagery

ImageryLayer's multidimensional data information can be accessed through the layer's multidimensionalInfo property. This information can then be used for analysis and visualization. For example, in the following snippet, the time dimension values associated with the wind_magdir variable are read from the layer's multidimensionalInfo property once the layer is loaded. Then time values are used to configure the TimeSlider widget to animate the wind speed and direction data over time.

view.whenLayerView(layer).then(() => {
  // get all time dimension values from the service, create an array of dates
  const windEpochDates = layer.multidimensionalInfo.variables[0].dimensions[0].values;
  const windDates = windEpochDates.map((item) => new Date(item));

  // time slider widget initialization
  // users can visualize daily wind information for all the time dimension available
  const timeSlider = new TimeSlider({
    mode: "instant",
    view: view,
    fullTimeExtent: {
      start: new Date(windDates[0]), // Jan 1, 2011,
      end: new Date(windDates[windDates.length - 1]) // Dec 31, 2011
    },
    // set the stops to match the dates coming from time dimension
    stops: {
      dates: windDates
    }
  });
});

To display the data based on a specified slice of a variable and dimensions, set the layer's mosaicRule.multidimensionalDefinition property to an array of desired dimensional definitions. For example, the following snippet shows how to update the layer's mosaicRule.multidimensionalDefinition to display the data based on a given StdZ (depth) value in response to a slider thumb change event.

depthSlider.on(["thumb-change", "thumb-drag"], (delta) => updateRenderer("StdZ", value));
const updateRenderer = promiseUtils.debounce(function (dimensionName, sliderData) {
  // set the depth or StdZ dimension of the layer corresponding to the slider's thumb location
  const multidimensionalDefinition = layer.mosaicRule.multidimensionalDefinition;
  const depthDef = multidimensionalDefinition.find((def) => def.dimensionName === "StdZ");
  if (dimensionName === "StdZ") {
    if (depthDef.values[0] === sliderData.value) {
      return;
    }
    depthDef.values[0] = sliderData.value;
  }
  layer.mosaicRule.multidimensionalDefinition = multidimensionalDefinition;
});

The multidimensionalSubset can be set on a layer to expose only a subset of multidimensional data that satisfies the requirements. For example, if you have one year of wind speed and direction data collected daily, but only want to expose a subset of the data for every day of October, then you can set the multidimensionalSubset property on the layer as shown in the code snippet below.

// Wind speed and direction info for every day of Oct will be available on the layer.
// Users will not be able to access data that falls outside of Oct.
// Only the data intersects the extent will be available to users.
const multidimensionalSubset = new MultidimensionalSubset({
  // extent covering california
  areaOfInterest: new Extent({
    xmax: -12195369.680716056,
    xmin: -14166833.514246799,
    ymax: 5336486.804891889,
    ymin: 3047044.933694898,
    spatialReference: {
      wkid: 102100
    }
  }),
  subsetDefinitions: [
    {
      variableName: "Vector-MagDir",
      dimensionName: "StdTime",
      values: [1412121600000, 1414713600000], // 10/1/14 - 10/31/14
      isSlice: false
    }
  ]
});
layer.multidimensionalSubset = multidimensionalSubset;

The following image illustrates when the multidimensionalDefinition and multidimensionalSubset properties are both set on the layer. Slices with the purple borders are slices included in the layer's multidimensionalSubset. The slice with the red border is the multidimensionalDefinition of the layer and what is visible on the map. The layer's multidimensionalDefinition must fall within the multidimensionalSubset, otherwise nothing will be displayed in the map.

layers-imagery

See also

Constructors

new ImageryLayer(properties)
Parameter
properties Object
optional

See the properties for a list of all the properties that may be passed into the constructor.

Example
// Typical usage
let layer = new ImageryLayer({
  // URL to the imagery service
  url: "https://landsat2.arcgis.com/arcgis/rest/services/Landsat8_Views/ImageServer"
});

Property Overview

Any properties can be set, retrieved or listened to. See the Working with Properties topic.
Show inherited properties Hide inherited properties
Name Type Summary Class
Number[]

Defines a band combination using 0-based band indexes.

more details
ImageryLayer
String

Blend modes are used to blend layers together to create an interesting effect in a layer, or even to produce what seems like a new layer.

more details
ImageryLayer
Object

Describes the layer's supported capabilities.

more details
ImageryLayer
Number

The compression quality value.

more details
ImageryLayer
Number

Controls the tolerance of the lerc compression algorithm.

more details
ImageryLayer
String

The copyright text as defined by the service.

more details
ImageryLayer
Object

A list of custom parameters appended to the URL of all resources fetched by the layer.

more details
ImageryLayer
String

The name of the class.

more details
Accessor
String

The SQL where clause used to filter rasters.

more details
ImageryLayer
Effect

Effect provides various filter functions that can be performed on the layer to achieve different visual effects similar to how image filters work.

more details
ImageryLayer
Field[]

An array of fields in the layer.

more details
ImageryLayer
FieldsIndex

A convenient property that can be used to make case-insensitive lookups for a field by name.

more details
ImageryLayer
String

The format of the exported image.

more details
ImageryLayer
Extent

The full extent of the layer.

more details
Layer
Boolean

Indicates if the layer has multidimensionalInfo.

more details
ImageryLayer
String

The unique ID assigned to the layer.

more details
Layer
Number

Indicates the maximum height of the image exported by the service.

more details
ImageryLayer
Number

Indicates the maximum width of the image exported by the service.

more details
ImageryLayer
String

Defines how to interpolate pixel values.

more details
ImageryLayer
Boolean

Indicates whether the layer will be included in the legend.

more details
ImageryLayer
String

Indicates how the layer should display in the LayerList widget.

more details
Layer
Boolean

Indicates whether the layer's resources have loaded.

more details
Layer
Error

The Error object returned if an error occurred while loading.

more details
Layer
String

Represents the status of a load operation.

more details
Layer
Object[]

A list of warnings which occurred while loading.

more details
Layer
Number

The maximum scale (most zoomed in) at which the layer is visible in the view.

more details
ImageryLayer
Number

The minimum scale (most zoomed out) at which the layer is visible in the view.

more details
ImageryLayer
MosaicRule

Defines how overlapping images should be mosaicked.

more details
ImageryLayer
RasterMultidimensionalInfo

The multidimensional information associated with the layer if the layer's hasMultidimensions property is true.

more details
ImageryLayer
MultidimensionalSubset

Represents a multidimensional subset of raster data.

more details
ImageryLayer
Number|Number[]

The pixel value representing no available information.

more details
ImageryLayer
String

Interpretation of the noData setting.

more details
ImageryLayer
String

The name of an oidfield containing a unique value or identifier for each raster in the layer.

more details
ImageryLayer
Number

The opacity of the layer.

more details
Layer
PixelFilterFunction

A function that processes pixelData.

more details
ImageryLayer
String

Raster source pixel type.

more details
ImageryLayer
Boolean

Indicates whether to display popups when features in the layer are clicked.

more details
ImageryLayer
PopupTemplate

The popup template for the layer.

more details
ImageryLayer
PortalItem

The portal item from which the layer is loaded.

more details
ImageryLayer
Field[]

A complete list of fields that consists of raster attribute table fields, item pixel value, service pixel value, service pixel value with various server defined function templates, and raster attribute table fields.

more details
ImageryLayer
RasterFunctionInfo[]

Returns raster function information for the image services, including the name, description, help, function type, and a thumbnail of pre-configured raster function templates.

more details
ImageryLayer
Number

Refresh interval of the layer in minutes.

more details
ImageryLayer
ClassBreaksRenderer|UniqueValueRenderer|RasterStretchRenderer|RasterShadedReliefRenderer|RasterColormapRenderer|VectorFieldRenderer|FlowRenderer

The renderer assigned to the layer.

more details
ImageryLayer
RasterFunction

Specifies the rule for how the requested image should be rendered.

more details
ImageryLayer
RasterInfo

Source raster information of the image service.

more details
ImageryLayer
Object

The image service's metadata JSON exposed by the ArcGIS REST API.

more details
ImageryLayer
SpatialReference

The spatial reference of the image service.

more details
ImageryLayer
TimeExtent

The layer's time extent.

more details
ImageryLayer
TimeInfo

TimeInfo provides information such as date fields that store start and end time for each feature and the fullTimeExtent for the layer.

more details
ImageryLayer
TimeInterval

A temporary offset of the time data based on a certain TimeInterval.

more details
ImageryLayer
String

The title of the layer used to identify it in places such as the LayerList widget.

more details
Layer
String For ImageryLayer the type is always "imagery". more detailsImageryLayer
String

The URL to the REST endpoint of the layer.

more details
ImageryLayer
Boolean

Determines if the layer will update its temporal data based on the view's timeExtent.

more details
ImageryLayer
Number

The version of ArcGIS Server in which the image service is published.

more details
ImageryLayer
Boolean

Indicates if the layer is visible in the View.

more details
Layer

Property Details

bandIds Number[]
Since: ArcGIS Maps SDK for JavaScript 4.19

Defines a band combination using 0-based band indexes. Set the bandIds to the desired band when applying a RasterStretchRenderer to the layer to get the correct result.

Default Value:null
blendMode String
Since: ArcGIS Maps SDK for JavaScript 4.16

Blend modes are used to blend layers together to create an interesting effect in a layer, or even to produce what seems like a new layer. Unlike the method of using transparency which can result in a washed-out top layer, blend modes can create a variety of very vibrant and intriguing results by blending a layer with the layer(s) below it.

When blending layers, a top layer is a layer that has a blend mode applied. All layers underneath the top layer are background layers. The default blending mode is normal where the top layer is simply displayed over the background layer. While this default behavior is perfectly acceptable, the use of blend modes on layers open up a world of endless possibilities to generate creative maps.

The layers in a GroupLayer are blended together in isolation from the rest of the map.

In the following screenshots, the vintage shaded relief layer is displayed over a firefly world imagery layer. The color blend mode is applied to the vintage shaded relief and the result looks like a new layer.

color-blend

Known Limitations

The following factors will affect the blend result:

  • Order of all layers
  • Layer opacity
  • Opacity of features in layers
  • Visibility of layers
  • By default, the very bottom layer in a map is drawn on a transparent background. You can change the MapView's background color.
Blend mode Description
normal The top layer is displayed over the background layer. The data of the top layer block the data of background layer where they overlap.
average Takes the mathematical average of top and background layers. Result of average blend mode is often similar to the effect of setting the layer's opacity to 50%.

Lighten blend modes:

The following blend modes create lighter results than all layers. In lighten blend modes, pure black colors in the top layer become transparent allowing the background layer to show through. White in the top layer will stay unchanged. Any color that is lighter than pure black is going to lighten colors in the top layer to varying degrees all way to pure white.

Lighten blend modes can be useful when lightening dark colors of the top layer or removing black colors from the result. The plus, lighten and screen modes can be used to brighten layers that have faded or dark colors on a dark background.

Blend mode Description
lighten Compares top and background layers and retains the lighter color. Colors in the top layer become transparent if they are darker than the overlapping colors in the background layer allowing the background layer to show through completely. Can be thought of as the opposite of darken blend mode.
lighter Colors in top and background layers are multiplied by their alphas (layer opacity and layer's data opacity. Then the resulting colors are added together. All overlapping midrange colors are lightened in the top layer. The opacity of layer and layer's data will affect the blend result.
plus Colors in top and background layers are added together. All overlapping midrange colors are lightened in the top layer. This mode is also known as add or linear-dodge.
screen Multiplies inverted colors in top and background layers then inverts the colors again. The resulting colors will be lighter than the original color with less contrast. Screen can produce many different levels of brightening depending on the luminosity values of the top layer. Can be thought of as the opposite of the multiply mode.
color-dodge Divides colors in background layer by the inverted top layer. This lightens the background layer depending on the value of the top layer. The brighter the top layer, the more its color affects the background layer. Decreases the contrast between top and background layers resulting in saturated mid-tones and blown highlights.

Darken blend modes:

The following blend modes create darker results than all layers. In darken blend modes, pure white in the top layer will become transparent allowing the background layer to show through. Black in the top layer will stay unchanged. Any color that is darker than pure white is going to darken a top layer to varying degrees all the way to pure black.

The multiply blend mode is often used to highlight shadows, show contrast, or accentuate an aspect of a map. For example, you can use multiply blend mode on a topographic map displayed over hillshade when you want to have your elevation show through the topographic layer. See the intro to layer blending sample.

The multiply and darken modes can be used to have dark labels of the basemap to show through top layers. See the darken blending sample.

The color-burn mode works well with colorful top and background layers since it increases saturation in mid-tones. It increases the contrast by tinting pixels in overlapping areas in top and bottom layers more towards the top layer color. Use this blend mode, when you want an effect with more contrast than multiply or darken.

The following screenshots show how the multiply blend mode used for creating a physical map of the world that shows both boundaries and elevation. multiply-blend

Blend mode Description
darken Emphasizes the darkest parts of overlapping layers. Colors in the top layer become transparent if they are lighter than the overlapping colors in the background layer, allowing the background layer to show through completely.
multiply Emphasizes the darkest parts of overlapping layers by multiplying colors of the top layer and the background layer. Midrange colors from top and background layers are mixed together more evenly.
color-burn Intensifies the dark areas in all layers. It increases the contrast between top and background layers, by tinting colors in overlapping area towards the top color. To do this it inverts colors of the background layer, divides the result by colors of the top layer, then inverts the results.

Contrast blend modes:

The following blend modes create contrast by both lightening the lighter areas and darkening the darker areas in the top layer by using lightening or darkening blend modes to create the blend. The contrast blend modes will lighten the colors lighter than 50% gray ([128,128,128]), and darken the colors darker than 50% gray. 50% gray will be transparent in the top layer. Each mode can create a variety of results depending on the colors of top and background layers being blended together. The overlay blend mode makes its calculations based on the brightness of the colors in the background layer while all of the other contrast blend modes make their calculations based on the brightness of the top layer. Some of these modes are designed to simulate the effect of shining a light through the top layer, effectively projecting upon the layers beneath it.

Contrast blend modes can be used to increase the contrast and saturation to have more vibrant colors and give a punch to your layers. For example, you can duplicate a layer and set overlay blend mode on the top layer to increase the contrast and tones of your layer. You can also add a polygon layer with a white fill symbol over a dark imagery layer and apply soft-light blend mode to increase the brightness in the imagery layer.

The following screenshots show an effect of the overlay blend mode on a GraphicsLayer. The left image shows when the buffer graphics layer has the normal blend mode. As you can see, the gray color for the buffer polygon is blocking the intersecting census tracts. The right image shows when the overlay blend mode is applied to the buffer graphics layer. The overlay blend mode darkens or lightens the gray buffer polygon depending on the colors of the background layer while the census tracts layer is shining through. See this in action.

Normal blend mode Overlay blend mode
no-blendmode overlay-blend
Blend mode Description
overlay Uses a combination of multiply and screen modes to darken and lighten colors in the top layer with the background layer always shining through. The result is darker color values in the background layer intensify the top layer, while lighter colors in the background layer wash out overlapping areas in the top layer.
soft-light Applies a half strength screen mode to lighter areas and half strength multiply mode to darken areas of the top layer. You can think of the soft-light as a softer version of the overlay mode.
hard-light Multiplies or screens the colors, depending on colors of the top layer. The effect is similar to shining a harsh spotlight on the top layer.
vivid-light Uses a combination of color-burn or color-dodge by increasing or decreasing the contrast, depending on colors in the top layer.

Component blend modes:

The following blend modes use primary color components, which are hue, saturation and luminosity to blend top and background layers. You can add a feature layer with a simple renderer over any layer and set hue, saturation, color or luminosity blend mode on this layer. With this technique, you create a brand new looking map.

The following screenshots show where the topo layer is blended with world hillshade layer with luminosity blend mode. The result is a drastically different looking map which preserves the brightness of the topo layer while adapting the hue and saturation of the hillshade layer.

color-blend
Blend mode Description
hue Creates an effect with the hue of the top layer and the luminosity and saturation of the background layer.
saturation Creates an effect with the saturation of the top layer and the hue and luminosity of the background layer. 50% gray with no saturation in the background layer will not produce any change.
luminosity Creates effect with the luminosity of the top layer and the hue and saturation of the background layer. Can be thought of as the opposite of color blend mode.
color Creates an effect with the hue and saturation of the top layer and the luminosity of the background layer. Can be thought of as the opposite of luminosity blend mode.

Composite blend modes:

The following blend modes can be used to mask the contents of top, background or both layers.

  • Destination modes are used to mask the data of the top layer with the data of the background layer.
  • Source modes are used to mask the data of the background layer with the data of the top layer.

The destination-in blend mode can be used to show areas of focus such as earthquakes, animal migration, or point-source pollution by revealing the underlying map, providing a bird’s eye view of the phenomenon. Check out multiple blending and groupLayer blending samples to see composite blend modes in action.

The following screenshots show feature and imagery layers on the left side on their own in the order they are drawn in the view. The imagery layer that contains land cover classification rasters. The feature layer contains 2007 county crops data. The right image shows the result of layer blending where destination-in blendMode is set on the imagery layer. As you can see, the effect is very different from the original layers. The blended result shows areas of cultivated crops only (where both imagery and feature layers overlap).

destination-in
Blend mode Description
destination-over Destination/background layer covers the top layer. The top layer is drawn underneath the destination layer. You'll see the top layer peek through wherever the background layer is transparent or has no data.
destination-atop Destination/background layer is drawn only where it overlaps the top layer. The top layer is drawn underneath the background layer. You'll see the top layer peek through wherever the background layer is transparent or has no data.
destination-in Destination/background layer is drawn only where it overlaps with the top layer. Everything else is made transparent.
destination-out Destination/background layer is drawn where it doesn't overlap the top layer. Everything else is made transparent.
source-atop Source/top layer is drawn only where it overlaps the background layer. You will see the background layer peek through where the source layer is transparent or has no data.
source-in Source/top layer is drawn only where it overlaps with the background layer. Everything else is made transparent.
source-out Source/top layer is drawn where it doesn't overlap the background layer. Everything else is made transparent.
xor Top and background layers are made transparent where they overlap. Both layers are drawn normal everywhere else.

Invert blend modes:

The following blend modes either invert or cancel out colors depending on colors of the background layer. These blend modes look for variations between top and background layers. For example, you can use difference or exclusion blend modes on two imagery layers of forest covers to visualize how forest covers changed from one year to another.

The invert blend mode can be used to turn any light basemap into a dark basemap to accommodate those who work in low-light conditions. The following screenshots show how setting the invert blend mode set on a feature layer with a simple renderer turns the world terrain basemap into a dark themed basemap in no time.

color-blend
Blend mode Description
difference Subtracts the darker of the overlapping colors from the lighter color. When two pixels with the same value are subtracted, the result is black. Blending with black produces no change. Blending with white inverts the colors. This blending mode is useful for aligning layers with similar content.
exclusion Similar to the difference blend mode, except that the resulting image is lighter overall. Overlapping areas with lighter color values are lightened, while darker overlapping color values become transparent.
minus Subtracts colors of the top layer from colors of the background layer making the blend result darker. In the case of negative values, black is displayed.
invert Inverts the background colors wherever the top and background layers overlap. The invert blend mode inverts the layer similar to a photographic negative.
reflect This blend mode creates effects as if you added shiny objects or areas of light in the layer. Black pixels in the background layer are ignored as if they were transparent.

Possible Values:"average"|"color-burn"|"color-dodge"|"color"|"darken"|"destination-atop"|"destination-in"|"destination-out"|"destination-over"|"difference"|"exclusion"|"hard-light"|"hue"|"invert"|"lighten"|"lighter"|"luminosity"|"minus"|"multiply"|"normal"|"overlay"|"plus"|"reflect"|"saturation"|"screen"|"soft-light"|"source-atop"|"source-in"|"source-out"|"vivid-light"|"xor"

Default Value:normal
See also
capabilities Object
Since: ArcGIS Maps SDK for JavaScript 4.16

Describes the layer's supported capabilities.

Properties
operations Object

Describes operations supported by the ImageryLayer.

Specification
supportsComputeHistograms Boolean

Indicates if the layer supports a compute histograms operation from an area of interest.

supportsExportImage Boolean

Indicates if the layer supports an export image operation based on a bounding box.

supportsIdentify Boolean

Indicates if the layer supports an identify operation on pixel values.

supportsMeasure Boolean

Indicates if the layer supports mensuration.

supportsDownload Boolean

Indicates if the layer allows the source image to be downloaded.

supportsQuery Boolean

Indicates if the layer supports an operation to query images.

supportsGetSamples Boolean

Indicates if the layer supports a sampling operation.

supportsProject Boolean

Indicates if the layer supports projection of geometries, including from/to image spatial reference.

supportsComputeStatisticsHistograms Boolean

Indicates if the layer supports an operation computing statistics and histograms from an area of interest.

supportsQueryBoundary Boolean

Indicates if the layer supports an operation to query the service's boundary.

supportsCalculateVolume Boolean

Indicates if the elevation layer supports an operation to compute volumes.

supportsComputePixelLocation Boolean

Indicates if the layer supports computing pixel location in pixel space.

query Object

Describes query operations supported by the layer. Use the query to query an imagery layer.

Specification
supportsStatistics Boolean

Indicates if the layer supports field-based statistical functions.

supportsOrderBy Boolean

Indicates if the layer returned in the query response can be ordered by one or more fields.

supportsDistinct Boolean

Indicates if the layer supports queries for distinct values based on fields.

supportsPagination Boolean

Indicates if the layer supports paged queries.

supportsStandardizedQueriesOnly Boolean

Indicates if the layer supports use of standardized queries.

maxRecordCount Boolean

The maximum number of records that will be returned for a given query.

compressionQuality Number

The compression quality value. Controls how much loss the image will be subjected to by the compression algorithm. Valid value ranges of compression quality are from 0 to 100. Only valid when using jpg or jpgpng image format.

compressionTolerance Number

Controls the tolerance of the lerc compression algorithm. The tolerance defines the maximum possible error of pixel values in the compressed image. It's a double value.

Default Value:0.01

The copyright text as defined by the service.

customParameters Object
Since: ArcGIS Maps SDK for JavaScript 4.20

A list of custom parameters appended to the URL of all resources fetched by the layer. It's an object with key-value pairs where value is a string.

Example
// send a custom parameter to your special service
let layer = new ImageryLayer({
  url: serviceUrl,
  customParameters: {
    "key": "my-special-key"
  }
});
declaredClass Stringreadonly inherited
Since: ArcGIS Maps SDK for JavaScript 4.7

The name of the class. The declared class name is formatted as esri.folder.className.

definitionExpression String

The SQL where clause used to filter rasters. Only the rasters that satisfy the definition expression are displayed in the View. This property overrides the mosaicRule's where property if both properties are set on the layer.

Since: ArcGIS Maps SDK for JavaScript 4.18

Effect provides various filter functions that can be performed on the layer to achieve different visual effects similar to how image filters work. This powerful capability allows you to apply css filter-like functions to layers to create custom visual effects to enhance the cartographic quality of your maps. This is done by applying the desired effect to the layer's effect property as a string or an array of objects to set scale dependent effects.

Notes

  • Set featureEffect property if different effects need to be applied features that meet or fail a specified filter.
  • If all of the following four properties are applied, then they will be applied in this order: featureEffect, effect, opacity and blendMode.

Known Limitations

  • The effect is not supported in 3D SceneViews.
  • The effect cannot be applied to a layer with a heatmap renderer.
  • The effect is not supported in layers with featureReduction of type cluster enabled.
  • See print for known printing limitations.
Default Value:null
See also
Examples
// the following effect will be applied to the layer at all scales
// brightness will be applied first, then hue-rotate followed by contrast
// changing order of the effects will change the final result
layer.effect = "brightness(5) hue-rotate(270deg) contrast(200%)";
// set a scale dependent bloom effect on the layer
layer.effect = [
  {
    scale: 36978595,
    value: "drop-shadow(3px, 3px, 4px)"
  },
  {
    scale: 18489297,
    value: "drop-shadow(2px, 2px, 3px)"
  },
  {
    scale: 4622324,
    value: "drop-shadow(1px, 1px, 2px)"
  }
];
fields Field[]

An array of fields in the layer. Each field represents an attribute that may contain a value for each raster in the layer.

See also
fieldsIndex FieldsIndexreadonly
Since: ArcGIS Maps SDK for JavaScript 4.21

A convenient property that can be used to make case-insensitive lookups for a field by name. This property is only available after the ImageryLayer has been loaded.

See also
Example
// lookup a field by name, name is case-insensitive
const fieldsIndex = layer.fieldsIndex.get("OBjecTID");

// if there's a field by that name, print it to the console
if (fieldsIndex) {
  console.log("fieldsIndex: ", fieldsIndex);
}
format String

The format of the exported image.

Possible Values:"png"|"png8"|"png24"|"png32"|"jpg"|"bmp"|"gif"|"jpgpng"|"lerc"|"tiff"

The full extent of the layer. By default, this is worldwide. This property may be used to set the extent of the view to match a layer's extent so that its features appear to fill the view. See the sample snippet below.

Example
// Once the layer loads, set the view's extent to the layer's fullextent
layer.when(function(){
  view.extent = layer.fullExtent;
});
hasMultidimensions Boolean

Indicates if the layer has multidimensionalInfo.

The unique ID assigned to the layer. If not set by the developer, it is automatically generated when the layer is loaded.

imageMaxHeight Number
Since: ArcGIS Maps SDK for JavaScript 4.4

Indicates the maximum height of the image exported by the service.

Default Value:4100
imageMaxWidth Number
Since: ArcGIS Maps SDK for JavaScript 4.4

Indicates the maximum width of the image exported by the service.

Default Value:15000
interpolation String
Since: ArcGIS Maps SDK for JavaScript 4.12

Defines how to interpolate pixel values.

Possible Values:"nearest"|"bilinear"|"cubic"|"majority"

legendEnabled Boolean
Since: ArcGIS Maps SDK for JavaScript 4.12

Indicates whether the layer will be included in the legend.

Default Value:true
listMode String inherited

Indicates how the layer should display in the LayerList widget. The possible values are listed below.

Value Description
show The layer is visible in the table of contents.
hide The layer is hidden in the table of contents.
hide-children If the layer is a GroupLayer, BuildingSceneLayer, KMLLayer, MapImageLayer, TileLayer or WMSLayer, hide the children layers from the table of contents.

Possible Values:"show"|"hide"|"hide-children"

Default Value:"show"
loaded Booleanreadonly inherited

Indicates whether the layer's resources have loaded. When true, all the properties of the object can be accessed.

Default Value:false
loadError Errorreadonly inherited

The Error object returned if an error occurred while loading.

Default Value:null
loadStatus Stringreadonly inherited

Represents the status of a load operation.

Value Description
not-loaded The object's resources have not loaded.
loading The object's resources are currently loading.
loaded The object's resources have loaded without errors.
failed The object's resources failed to load. See loadError for more details.

Possible Values:"not-loaded"|"loading"|"failed"|"loaded"

Default Value:not-loaded
loadWarnings Object[]readonly inherited

A list of warnings which occurred while loading.

maxScale Number

The maximum scale (most zoomed in) at which the layer is visible in the view. If the map is zoomed in beyond this scale, the layer will not be visible. A value of 0 means the layer does not have a maximum scale. The maxScale value should always be smaller than the minScale value, and greater than or equal to the service specification.

Default Value:0
Examples
// The layer will not be visible when the view is zoomed in beyond a scale of 1:1,000
layer.maxScale = 1000;
// The layer's visibility is not restricted to a maximum scale.
layer.maxScale = 0;
minScale Number

The minimum scale (most zoomed out) at which the layer is visible in the view. If the map is zoomed out beyond this scale, the layer will not be visible. A value of 0 means the layer does not have a minimum scale. The minScale value should always be larger than the maxScale value, and lesser than or equal to the service specification.

Default Value:0
Examples
// The layer will not be visible when the view is zoomed out beyond a scale of 1:3,000,000
layer.minScale = 3000000;
// The layer's visibility is not restricted to a minimum scale.
layer.minScale = 0;
mosaicRule MosaicRuleautocast

Defines how overlapping images should be mosaicked.

multidimensionalInfo RasterMultidimensionalInforeadonly

The multidimensional information associated with the layer if the layer's hasMultidimensions property is true. If defined, multidimensional information contains data in multiple dimensions like time and depth/height, and contains multiple variables. Defining slices of particular dimensions in the layer is handled with the multidimensionalDefinition property of the mosaicRule.

Default Value:null
See also
multidimensionalSubset MultidimensionalSubsetautocast
Since: ArcGIS Maps SDK for JavaScript 4.25

Represents a multidimensional subset of raster data. This includes subsets of both variables and dimensions. When the multidimensionalSubset is defined on a layer, the mosaicRule.multidimensionalDefinition must be within the defined multidimensionalSubset, otherwise nothing will be displayed.

See also
Example
// set a multidimensinalSubset on the imagery layer
// so that users can only access sea temperature data in the atlantic ocean
// between April 7 - 18, 2014 and at depths between -500 - 0.
const multidimensionalSubset = new MultidimensionalSubset({
  // area over atlantic ocean
  areaOfInterest: new Extent({
    type: "extent",
    xmax: 3041935.5384527617,
    xmin: -10166382.94922227,
    ymax: 12406741.274438996,
    ymin: -5908793.695137047,
    spatialReference: {
      wkid: 102100
    }
  }),
  subsetDefinitions: [
    {
      variableName: "water_temp",
      dimensionName: "StdTime",
      values: [1396828800000, 1397779200000], // 4/7 - 4/18
      isSlice: false
    },
    {
      variableName: "water_temp",
      dimensionName: "StdZ",
      values: [-500, 0],
      isSlice: false
    }
  ],
});
layer.multidimensionalSubset = multidimensionalSubset;
noData Number|Number[]
Since: ArcGIS Maps SDK for JavaScript 4.12

The pixel value representing no available information. Can be a number (same value for all bands) or array (specific value for each band).

noDataInterpretation String
Since: ArcGIS Maps SDK for JavaScript 4.12

Interpretation of the noData setting.

Value Description
any Pixel is transparent if any band matches noData value.
all Pixel is transparent only if all bands match noData value.

Possible Values:"any"|"all"

objectIdField String

The name of an oid field containing a unique value or identifier for each raster in the layer.

See also
opacity Number inherited

The opacity of the layer. This value can range between 1 and 0, where 0 is 100 percent transparent and 1 is completely opaque.

Default Value:1
Example
// Makes the layer 50% transparent
layer.opacity = 0.5;
pixelFilter PixelFilterFunction

A function that processes pixelData. The pixelData object contains a pixelBlock property that gives you access to all of the pixels in the raster on the client.

Inside the pixelFilter you may loop through all the pixels found in the pixelBlock property of the pixelData object and process them. This function may be used to hide some pixels from the view, alter their values, and change their color. The pixelFilter should be used when the imagery layer's format is lerc or tiff as these formats return raw pixel data to the client.

See also
Example
let layer = new ImageryLayer({
  url: // url to the image service
  pixelFilter: colorize  // see the colorize() function below
});

// This function is applied to the pixelFilter property of the layer.
// It takes the original value of each pixel and converts it to an RGB
// representation to color the layer on a blue - red ramp. Blue pixels
// represent low values and red pixels represent high values. View the sample
// referenced above to see how this function works

function colorize(pixelData) {
  // If there isn't pixelData, a pixelBlock, nor pixels, exit the function
  if (pixelData === null || pixelData.pixelBlock === null || pixelData.pixelBlock.pixels === null) {
    return;
  }

  // The pixelBlock stores the values of all pixels visible in the view
  let pixelBlock = pixelData.pixelBlock;

  // Get the min and max values of the data in the current view
  let minValue = pixelBlock.statistics[0].minValue;
  let maxValue = pixelBlock.statistics[0].maxValue;

  // The mask is an array that determines which pixels are visible to the client
  let mask = pixelBlock.mask;

  // The pixels visible in the view
  let pixels = pixelBlock.pixels;

  // The number of pixels in the pixelBlock
  let numPixels = pixelBlock.width * pixelBlock.height;

  // Calculate the factor by which to determine the red and blue
  // values in the colorized version of the layer
  let factor = 255.0 / (maxValue - minValue);

  // Get the pixels containing temperature values in the only band of the data
  let band1 = pixels[0];

  // Create empty arrays for each of the RGB bands to set on the pixelBlock
  let rBand = [];
  let gBand = [];
  let bBand = [];

  // Loop through all the pixels in the view
  for (i = 0; i < numPixels; i++) {
    // Get the pixel value recorded at the pixel location
    let tempValue = band1[i];
    // Calculate the red value based on the factor
    let red = (tempValue - minValue) * factor;

    // Sets a color between blue (lowest) and red (highest) in each band
    rBand[i] = red;
    gBand[i] = 0;
    bBand[i] = 255 - red;
  }

  // Set the new pixel values on the pixelBlock (now three bands)
  pixelData.pixelBlock.pixels = [rBand, gBand, bBand];
  pixelData.pixelBlock.pixelType = "u8"; // u8 is used for color
}
pixelType String

Raster source pixel type.

Value Range of values that each cell can contain
unknown Pixel type is unknown
s8 -128 to 127
s16 -32768 to 32767
s32 -2147483648 to 2147483647
u8 0 to 255
u16 0 to 65535
u32 0 to 4294967295
f32 -3.402823466e+38 to 3.402823466e+38
f64 0 to 18446744073709551616

Possible Values:"unknown"|"s8"|"s16"|"s32"|"u8"|"u16"|"u32"|"f32"|"f64"

popupEnabled Boolean

Indicates whether to display popups when features in the layer are clicked.

Default Value:true
See also
popupTemplate PopupTemplateautocast

The popup template for the layer. When set on the layer, the popupTemplate allows users to access attributes and display their values using text and/or charts in the view's popup when a pixel is clicked. See this sample for an example of how PopupTemplate interacts with an ImageryLayer.

A default popup template is automatically used if no popupTemplate has been defined when Popup.defaultPopupTemplateEnabled is set to true.

See also
Example
// displays the temperature stored in the clicked pixel
layer.popupTemplate: {
  title: "Sea Surface Temperature",
  content: "{Raster.ServicePixelValue}° Celsius"
}
portalItem PortalItem

The portal item from which the layer is loaded. If the portal item references a Feature Service or Scene Service, then you can specify a single layer to load with the layerId property.

Beginning with version 4.17, it is possible to load tables from feature service items hosted in ArcGIS Online and ArcGIS Enterprise. This only applies to feature layers, and will successfully load if FeatureLayer.isTable returns true.

Examples
// While this example uses FeatureLayer, this same pattern can be
// used for other layers that may be loaded from portalItem ids.
const layer = new FeatureLayer({
  portalItem: {  // autocasts as new PortalItem()
    id: "caa9bd9da1f4487cb4989824053bb847"
  }  // the first layer in the service is returned
});
// Set hostname when using an on-premise portal (default is ArcGIS Online)
// esriConfig.portalUrl = "http://myHostName.esri.com/arcgis";

// While this example uses FeatureLayer, this same pattern can be
// used for SceneLayers.
const layer = new FeatureLayer({
  portalItem: {  // autocasts as new PortalItem()
    id: "8d26f04f31f642b6828b7023b84c2188"
  },
  // loads the third item in the given feature service
  layerId: 2
});
// Initialize GeoJSONLayer by referencing a portalItem id pointing to geojson file.
const layer = new GeoJSONLayer({
  portalItem: new PortalItem({
    id: "81e769cd7031482797e1b0768f23c7e1",
    // optionally define the portal, of the item.
    // if not specified, the default portal defined is used.
    // see https://developers.arcgis.com/javascript/latest/api-reference/esri-config.html#portalUrl
    portal: new Portal({
      url: "https://jsapi.maps.arcgis.com/"
    })
  }
});
// This snippet loads a table hosted in ArcGIS Online.
const table = new FeatureLayer({
  portalItem: { // autocasts as esri/portal/PortalItem
    id: "123f4410054b43d7a0bacc1533ceb8dc"
  }
});

// Before adding the table to the map, it must first be loaded and confirm it is the right type.
table.load().then(function() {
  if (table.isTable) {
    map.tables.add(table);
  }
});
rasterFields Field[]readonly

A complete list of fields that consists of raster attribute table fields, item pixel value, service pixel value, service pixel value with various server defined function templates, and raster attribute table fields. This list is used for layer's popupTemplate.

It is essential in many imagery workflows to show pixel values and related categorical information (if applicable) in a popup. To meet this requirement, there're additional raster fields used in image service popups, representing pixel values and corresponding attributes if the service has additional rasterAttributeTable resource. These raster fields are prefixed with Raster. to indicate that they are special fields and avoid any potential conflict with fields from service info.

Pixel value fields

Below is a list of raster fields that return different types of pixel values and their descriptions.

Service pixel value

The Raster.ServicePixelValue field returns a pixel value at the identifying location, after dynamic mosaicking (if applicable) and processing is done using layer's current mosaicRule and renderingRule settings. This field exists for all image services. The server side dynamic mosaicking process is only applicable if the service is published from a mosaic dataset.

Raw service pixel value

The Raster.ServicePixelValue.Raw field returns a pixel value at the identifying location, after dynamic mosaicking (if applicable) but without further processing. It uses layer's current mosaicRule and None rendering rule. This field only exists if the image service info has allowRasterFunction: true, and has a None entry in rasterFunctionInfos.

Service pixel value from server side raster functions

The Raster.ServicePixelValue.RFTNAME field returns a pixel value at the identifying location, after dynamic mosaicking (if applicable) and processing using any predefined sever side raster function. The list of available functions is defined by rasterFunctionInfos in image service root resource, except None function, which is already mapped as Raw Service Pixel Value. This field only exists if the image service info has allowRasterFunction: true.

Item pixel value

The Raster.ItemPixelValue field returns a pixel value representing pixel values of each of the individual images in the image service. This is only applicable to image services published from a mosaic dataset. It can be retrieved from the image service using either the identify or the getSamples method.

For example, for a service published from a mosaic dataset with the following raster functions:

rasterFunctionInfos": [
 { "name": "None", "description": "", "help": ""},
 { "name": "EVI", "description": "", "help": ""}],
 { "name": "VI", "description": "", "help": ""}
]

You can have the following additional raster fields: Raster.ServicePixelValue, Raster.ServicePixelValue.Raw, Raster.ServicePixelValue.EVI, Raster.ServicePixelValue.VI and Raster.ItemPixelValue.

Pixel value fields support formatting. Since an image service can have multiple bands, pixel value represents multiple bands, and shouldn't be assumed as a single number. This needs to be considered when formatting values.

Categorical attributes fields for pixel value

When working with categorical data (e.g. Land Cover data), image service info may have an associated rasterAttributeTable resource, indicated in root resource via the hasRasterAttributeTable flag. A raster attribute table always has a Value field, and each record in the table represents a pixel value mapping to associated categorical fields, such as the ClassName (Raster.ClassName), Count (Raster.Count) or color representation (Raster.Red, Raster.Green and Raster.Blue) fields of the value.

Vector fields

The Raster.Magnitude and Raster.Direction fields return magnitude and direction values from a multidimensional dataset with a vector field.

Example
layer.when(() => {
  // print out field names returned in layer.rasterFields
  layer.rasterFields.forEach((field) => {
    console.log(field.name);
  });
});
rasterFunctionInfos RasterFunctionInfo[]readonly
Since: ArcGIS Maps SDK for JavaScript 4.22

Returns raster function information for the image services, including the name, description, help, function type, and a thumbnail of pre-configured raster function templates.

Default Value:null
refreshInterval Number
Since: ArcGIS Maps SDK for JavaScript 4.6

Refresh interval of the layer in minutes. Value of 0 indicates no refresh.

Default Value:0
See also
Example
// the layer will be refreshed every 6 seconds.
layer.refreshInterval = 0.1;
Since: ArcGIS Maps SDK for JavaScript 4.11

The renderer assigned to the layer. The renderer defines how to visualize pixels in the imagery layer. Depending on the renderer type, the pixels may be stretched across the color ramp, classified, have different symbols based on values, or show shaded reliefs.

If both renderer and pixelFilter is applied to an ImageryLayer then pixelFilter will override the renderer.

See also
renderingRule RasterFunctionautocast

Specifies the rule for how the requested image should be rendered. When renderingRule applied, the server returns an updated service information that reflects a custom processing as defined by the rendering rule.

See also
Example
const stretchFunction = new RasterFunction({
functionName: "Stretch",
  functionArguments: {
    StretchType: 5, // (0 = None, 3 = StandardDeviation, 4 = Histogram Equalization, 5 = MinMax, 6 = PercentClip, 9 = Sigmoid)
    Min: 0,
    Max: 255,
    Raster: "$$" // $$(default) refers to the entire image service, $2 refers to the second image of the image service
  },
  outputPixelType: "u8"
});

const colorFunction = new RasterFunction({
  functionName: "Colormap",
  functionArguments: {
    ColorrampName: "Temperature", // other examples: "Slope", "Surface", "Blue Bright"....
    Raster: stretchFunction // chaining multiple rasterfunctions
  }
});

const imageryLayer = new ImageryLayer({
  url:
    "https://sampleserver6.arcgisonline.com/arcgis/rest/services/ScientificData/SeaTemperature/ImageServer"
});

imageryLayer.renderingRule = colorFunction; // Set rendering rule to the raster function
serviceRasterInfo RasterInfoautocastreadonly
Since: ArcGIS Maps SDK for JavaScript 4.12

Source raster information of the image service. The layer must be loaded before serviceRasterInfo can be accessed.

See also
sourceJSON Object
Since: ArcGIS Maps SDK for JavaScript 4.13

The image service's metadata JSON exposed by the ArcGIS REST API. While most commonly used properties are exposed on the ImageryLayer class directly, this property gives access to all information returned by the image service. This property is useful if working in an application built using an older version of the API which requires access to image service properties from a more recent version.

spatialReference SpatialReferenceautocastreadonly

The spatial reference of the image service.

timeExtent TimeExtentautocast
Since: ArcGIS Maps SDK for JavaScript 4.14

The layer's time extent. When the layer's useViewTime is false, the layer instructs the view to show data from the layer based on this time extent. If the useViewTime is true, and both layer and view time extents are set, then features that fall within the intersection of the view and layer time extents will be displayed. For example, if the layer's time extent is set to display features between 1970 and 1975 and the view has a time extent set to 1972-1980, the effective time on the feature layer will be 1972-1975.

Default Value:null
Examples
if (!layer.useViewTime) {
  if (layer.timeExtent) {
    console.log("Current timeExtent:", layer.timeExtent.start, " - ", layer.timeExtent.end}
  } else {
    console.log("The layer will display data within the view's timeExtent.");
    console.log("Current view.timeExtent:", view.timeExtent.start, " - ", view.timeExtent.end}
  }
}
// set the timeExtent on the layer and useViewTime false
// In this case, the layer will honor its timeExtent and ignore
// the view's timeExtent
const layer = new ImageryLayer({
  url: "https://sampleserver6.arcgisonline.com/arcgis/rest/services/ScientificData/SeaTemperature/ImageServer",
  timeExtent: {
    start: new Date(2014, 4, 18),
    end: new Date(2014, 4, 19)
  },
  useViewTime: false
});
// timeExtent is set on the layer and the view
// In this case, the layer will display features that fall
// within the intersection of view and layer time extents
// features within Jan 1, 1976 - Jan 1, 1981 will be displayed
const view = new MapView({
  timeExtent: {
    start: new Date(1976, 0, 1),
    end: new Date(2002, 0, 1)
  }
});
const layer = new FeatureLayer({
  url: myUrl,
  timeExtent: {
    start: new Date(1974, 0, 1),
    end: new Date(1981, 0, 1)
  }
});
timeInfo TimeInfoautocast
Since: ArcGIS Maps SDK for JavaScript 4.11

TimeInfo provides information such as date fields that store start and end time for each feature and the fullTimeExtent for the layer. The timeInfo property, along with its startField and endField properties, must be set at the time of layer initialization if it is being set for a CSVLayer, GeoJSONLayer or FeatureLayer initialized from client-side features. The fullTimeExtent for timeInfo is automatically calculated based on its startField and endField properties. The timeInfo parameters cannot be changed after the layer is loaded.

Default Value:null
Example
// create geojson layer from usgs earthquakes geojson feed
const geojsonLayer = new GeoJSONLayer({
  url: "https://earthquake.usgs.gov/earthquakes/feed/v1.0/summary/all_month.geojson",
  copyright: "USGS Earthquakes",
  fields: [
    { "name": "mag", "type": "double" },
    { "name": "place", "type": "string" },
    { "name": "time", "type": "date" }, // date field
    { "name": "depth", "type": "double" }
  ],
  // timeInfo can be used to do temporal queries
  // set the startField and endField.
  // timeExtent is automatically calculated from the
  // the start and end date fields
  // The date values must be in milliseconds number from the UNIX epoch specified in UTC.
  timeInfo: {
    startField: "time"
  }
});
Since: ArcGIS Maps SDK for JavaScript 4.14

A temporary offset of the time data based on a certain TimeInterval. This allows users to overlay features from two or more time-aware layers with different time extents. For example, if a layer has data recorded for the year 1970, an offset value of 2 years would temporarily shift the data to 1972. You can then overlay this data with data recorded in 1972. A time offset can be used for display purposes only. The query and selection are not affected by the offset.

Default Value:null
Example
// Offset a CSV Layer containing hurricanes from 2015 so that they appear in 2019 (+4 years).
let layer = new CSVLayer({
  url: `hurricanes-and-storms-2015.csv`,
  timeOffset: {
    value: 4,
    unit: "years"
  },
  timeInfo: {
    startField: "ISO_time"
  },
  renderer: {
    type: "simple",
    symbol: {
      type: "simple-marker",
      size: 6,
      color: "red",
      outline: {
        width: 0.5,
        color: "black"
      }
    }
  }
});

The title of the layer used to identify it in places such as the LayerList widget.

If the layer is loaded from a portal item, the title of the portal item will be used. If a layer is loaded as part of a webmap or a webscene, then the title of the layer as stored in the webmap/webscene will be used.

type Stringreadonly

For ImageryLayer the type is always "imagery".

url String

The URL to the REST endpoint of the layer. The URL may either point to a resource on ArcGIS Enterprise or ArcGIS Online.

Example
// This url must point to an Image Service
let layer = new ImageryLayer({
  url: "http://sampleserver6.arcgisonline.com/arcgis/rest/services/CharlotteLAS/ImageServer"
});
useViewTime Boolean
Since: ArcGIS Maps SDK for JavaScript 4.14

Determines if the layer will update its temporal data based on the view's timeExtent. When false, the layer will display its temporal data based on the layer's timeExtent, regardless of changes to the view. If both view and layer time extents are set while this property is true, then the features that fall within the intersection of the view and layer time extents will be displayed. For example, if a layer's time extent is set to display features between 1970 and 1975 and the view has a time extent set to 1972-1980, the effective time on the feature layer will be 1972-1975.

Default Value:true
Example
if (featureLayer.useViewTime) {
  console.log("Displaying data between:", view.timeExtent.start, " - ", view.timeExtent.end);
}
version Numberreadonly

The version of ArcGIS Server in which the image service is published.

Example
// Prints the version number to the console, e.g. 10.2, 10.3, 10.41
console.log(layer.version);
visible Boolean inherited

Indicates if the layer is visible in the View. When false, the layer may still be added to a Map instance that is referenced in a view, but its features will not be visible in the view.

Default Value:true
Example
// The layer is no longer visible in the view
layer.visible = false;

Method Overview

Show inherited methods Hide inherited methods
Name Return Type Summary Class

Adds one or more handles which are to be tied to the lifecycle of the object.

more details
Accessor

Cancels a load() operation if it is already in progress.

more details
Layer
Promise<ImageAngleResult>

Computes the rotation angle of a ImageryLayer at a given location.

more details
ImageryLayer
Promise<object>

Computes histograms based on the provided ImageHistogramParameters.

more details
ImageryLayer
Promise<ImagePixelLocationResult>

Computes the corresponding pixel location in columns and rows for an image based on input geometry.

more details
ImageryLayer
Promise<object>

Computes statistics and histograms for the provided ImageHistogramParameters.

more details
ImageryLayer
Promise<LayerView>

Called by the views, such as MapView and SceneView, when the layer is added to the Map.layers collection and a layer view must be created for it.

more details
Layer
PopupTemplate

Creates a default popup template for the layer, populated with all the fields of the layer.

more details
ImageryLayer

Destroys the layer and any associated resources (including its portalItem, if it is a property on the layer).

more details
Layer
Boolean

Emits an event on the instance.

more details
Layer
Promise<object>

Fetches custom attribution data for the layer when it becomes available.

more details
Layer
Promise<object>

Returns an image using the export REST operation that displays data from an ImageryLayer.

more details
ImageryLayer
Promise<RasterInfo>

Generates raster info for the specified rendering rule.

more details
ImageryLayer
Promise<object>

Gets the image coordinate system information of a catalog item in an image service.

more details
ImageryLayer
Promise<RasterInfo>

Get the raster info of a catalog item in an image service.

more details
ImageryLayer
Promise<ImageSampleResult>

Returns sample point locations, pixel values and corresponding resolutions of the source data for a given geometry.

more details
ImageryLayer
Boolean

Indicates whether there is an event listener on the instance that matches the provided event name.

more details
Layer
Boolean

Returns true if a named group of handles exist.

more details
Accessor
Promise<ImageIdentifyResult>

Sends a request to the ArcGIS REST image service to identify content based on the specified ImageIdentifyParameters.

more details
ImageryLayer
Boolean

isFulfilled() may be used to verify if creating an instance of the class is fulfilled (either resolved or rejected).

more details
Layer
Boolean

isRejected() may be used to verify if creating an instance of the class is rejected.

more details
Layer
Boolean

isResolved() may be used to verify if creating an instance of the class is resolved.

more details
Layer
Promise

Loads the resources referenced by this class.

more details
Layer
Object

Registers an event handler on the instance.

more details
Layer
Promise<number[]>

Executes a Query against the image service and returns an array of Object IDs for the rasters.

more details
ImageryLayer
Promise<number>

Executes a Query against the image service and returns the number of rasters that satisfy the query.

more details
ImageryLayer
Promise<FeatureSet>

Executes a Query against an image service and returns a FeatureSet, which can be accessed using the .then() method once the promise resolves.

more details
ImageryLayer

Executes the pixelFilter function and redraws the layer.

more details
ImageryLayer

Fetches all the data for the layer.

more details
ImageryLayer

Removes a group of handles owned by the object.

more details
Accessor
Promise

when() may be leveraged once an instance of the class is created.

more details
Layer

Method Details

addHandles(handleOrHandles, groupKey)inherited
Since: ArcGIS Maps SDK for JavaScript 4.25

Adds one or more handles which are to be tied to the lifecycle of the object. The handles will be removed when the object is destroyed.

// Manually manage handles
const handle = reactiveUtils.when(
  () => !view.updating,
  () => {
    wkidSelect.disabled = false;
  },
  { once: true }
);

// Handle gets removed when the object is destroyed.
this.addHandles(handle);
Parameters
handleOrHandles WatchHandle|WatchHandle[]

Handles marked for removal once the object is destroyed.

groupKey *
optional

Key identifying the group to which the handles should be added. All the handles in the group can later be removed with Accessor.removeHandles(). If no key is provided the handles are added to a default group.

cancelLoad()inherited

Cancels a load() operation if it is already in progress.

computeAngles(parameters, requestOptions){Promise<ImageAngleResult>}
Since: ArcGIS Maps SDK for JavaScript 4.22
beta

Computes the rotation angle of a ImageryLayer at a given location. This operation is supported at 10.9.1 and later.

Parameters
Autocasts from Object

Specifies parameters for computing angles.

requestOptions Object
optional

Additional options to be used for the data request (will override requestOptions defined during construction).

Returns
Type Description
Promise<ImageAngleResult> When resolved, returns an instance of ImageAngleResult containing computed north and up angles.
See also
computeHistograms(parameters, requestOptions){Promise<object>}
Since: ArcGIS Maps SDK for JavaScript 4.18

Computes histograms based on the provided ImageHistogramParameters. If a rendering rule and a mosaic rule are not specified, the current settings on the layer will be used. This operation is supported by an image service published with a mosaic dataset or a raster dataset at ArcGIS Server 10.4 and later. The result of this operation contains histograms computed for the given extent.

Parameters
Autocasts from Object

Specifies parameters for computing histograms.

requestOptions Object
optional

Additional options to be used for the data request (will override requestOptions defined during construction).

Returns
Type Description
Promise<object> Resolves to an object containing histogram results. See the object specification table below for details.
Property Type Description
histograms[] RasterHistogram Result containing raster histograms.
Example
// set the pixel size parameter to match the current
// resolution of the view and spatial reference
let pixelSize = {
  x:view.resolution,
  y:view.resolution,
  spatialReference: {
    wkid: view.spatialReference.wkid
  }
}
// set the histogram parameters to request
// data for the current view extent and resolution
let params = new ImageHistogramParameters({
  geometry:  view.extent,
  pixelSize: pixelSize
});

// request for histograms for the specified parameters
layer.computeHistograms(params).then(function(results){
  // results are returned and process it as needed.
  console.log("histograms and stats", results);
})
.catch(function(err){
  console.log("err", err)
});
computePixelSpaceLocations(parameters, requestOptions){Promise<ImagePixelLocationResult>}
Since: ArcGIS Maps SDK for JavaScript 4.22

Computes the corresponding pixel location in columns and rows for an image based on input geometry. Requires that the raster catalog item has a valid icsToPixel resource.

Parameters

Specifies parameters for computing image space pixel location.

requestOptions Object
optional

Additional options to be used for the data request (will override requestOptions defined during construction).

Returns
Type Description
Promise<ImagePixelLocationResult> When resolved, returns an instance of ImagePixelLocationResult containing x and y values for the column and row of each input geometry.
See also
computeStatisticsHistograms(parameters, requestOptions){Promise<object>}
Since: ArcGIS Maps SDK for JavaScript 4.18

Computes statistics and histograms for the provided ImageHistogramParameters. If a rendering rule and a mosaic rule are not specified, the current settings on the layer will be used. This operation is supported by an image service published with a mosaic dataset or a raster dataset at ArcGIS Server 10.4 and later. The result of this operation contains both statistics and histograms computed for the given extent.

Parameters
Autocasts from Object

Specifies parameters for computing statistics and histograms.

requestOptions Object
optional

Additional options to be used for the data request (will override requestOptions defined during construction).

Returns
Type Description
Promise<object> Resolves to an object containing histogram and statistics results. See the object specification table below for details.
Property Type Description
histograms[] RasterHistogram Result containing raster histograms.
bandStatistics[] RasterBandStatistics Raster band statistics.
Example
// set the pixel size parameter to match the current
// resolution of the view and spatial reference
let pixelSize = {
  x:view.resolution,
  y:view.resolution,
  spatialReference: {
    wkid: view.spatialReference.wkid
  }
}
// set the histogram parameters to request
// data for the current view extent and resolution
let params = new ImageHistogramParameters({
  geometry:  view.extent,
  pixelSize: pixelSize
});

// request for histograms and statistics for the specified parameters
layer.computeStatisticsHistograms(params).then(function(results){
  // results are returned and process it as needed.
  console.log("histograms and stats", results);
})
.catch(function(err){
  console.log("err", err)
});
createLayerView(view, options){Promise<LayerView>}inherited

Called by the views, such as MapView and SceneView, when the layer is added to the Map.layers collection and a layer view must be created for it. This method is used internally and there is no use case for invoking it directly.

Parameters
view *

The parent view.

options Object
optional

An object specifying additional options. See the object specification table below for the required properties of this object.

Specification
signal AbortSignal
optional

A signal to abort the creation of the layerview.

Returns
Type Description
Promise<LayerView> Resolves with a LayerView instance.
See also
createPopupTemplate(options){PopupTemplate}
Since: ArcGIS Maps SDK for JavaScript 4.11

Creates a default popup template for the layer, populated with all the fields of the layer.

Parameter
optional

Options for creating the popup template.

Returns
Type Description
PopupTemplate The popup template, or null if the layer does not have any fields.
destroy()inherited
Since: ArcGIS Maps SDK for JavaScript 4.17

Destroys the layer and any associated resources (including its portalItem, if it is a property on the layer). The layer can no longer be used once it has been destroyed.

The destroyed layer will be removed from its parent object like Map, WebMap, WebScene, Basemap, Ground, or GroupLayer.

See also
emit(type, event){Boolean}inherited
Since: ArcGIS Maps SDK for JavaScript 4.5

Emits an event on the instance. This method should only be used when creating subclasses of this class.

Parameters
type String

The name of the event.

event Object
optional

The event payload.

Returns
Type Description
Boolean true if a listener was notified
fetchAttributionData(){Promise<object>}inherited

Fetches custom attribution data for the layer when it becomes available.

Returns
Type Description
Promise<object> Resolves to an object containing custom attribution data for the layer.
fetchImage(extent, width, height, options){Promise<object>}

Returns an image using the export REST operation that displays data from an ImageryLayer.

Parameters
extent Extent

The extent of the image to export.

width Number

The width of the image in pixels.

height Number

The height of the image in pixels.

options Object
optional

The parameter options is an object with the following properties.

Specification
signal AbortSignal
optional

An AbortSignal to abort the request. If canceled, the promise will be rejected with an error named AbortError. See also AbortController.

Returns
Type Description
Promise<object> Resolves to an object containing the parameters of the exported image including the PixelData. The pixelData contains pixelBlock which returns each pixel in the image. Use this object to call the export REST operation.
generateRasterInfo(renderingRule, options){Promise<RasterInfo>}
Since: ArcGIS Maps SDK for JavaScript 4.12

Generates raster info for the specified rendering rule.

Parameters
renderingRule RasterFunction autocast
Autocasts from Object

Rendering rule for the requested raster info.

options Object
optional

An object with the following properties.

Specification
signal AbortSignal
optional

Signal object that can be used to abort the asynchronous task. The returned promise will be rejected with an Error named AbortError when an abort is signaled. See also AbortController for more information on how to construct a controller that can be used to deliver abort signals.

Returns
Type Description
Promise<RasterInfo> When resolved, a RasterInfo containing info specific to the requested rendering rule is returned.
getCatalogItemICSInfo(rasterId, options){Promise<object>}
Since: ArcGIS Maps SDK for JavaScript 4.13

Gets the image coordinate system information of a catalog item in an image service. The returned object can be used to set the 2D MapView's spatialReference and extent so that the image can be displayed in its original coordinate system. The image service must have a catalog capability.

Parameters
rasterId Number

Raster catalog id.

options Object
optional

An object with the following properties.

Specification
signal AbortSignal
optional

Signal object that can be used to abort the asynchronous task. The returned promise will be rejected with an Error named AbortError when an abort is signaled. See also AbortController for more information on how to construct a controller that can be used to deliver abort signals.

Returns
Type Description
Promise<object> When resolved, returns an object containing image coordinate system of the raster catalog item.
See also
Example
// get image coordinate system of the specified catalog item
// for example Raster.OBJECTID = 1600
layer.getCatalogItemICSInfo(imageId).then(function(info) {
// create a spatialReference object and set its
// imageCoordinateSystem property
 let sr = { // autocasts to esri/geometry/SpatialReference
   imageCoordinateSystem: { id: imageId }
 };

 // Calculate an extent for the mapview based on the image's extent
 // in its original coordinate system
 const width = document.getElementById("viewDiv").getBoundingClientRect().width;
 const height = document.getElementById("viewDiv").getBoundingClientRect().height;
 const newExt = info.icsExtent.clone();
 const scaleFactor = 5;
 newExt.xmin = (newExt.xmin + newExt.xmax - width * scaleFactor) / 2;
 newExt.xmax = newExt.xmin + width * scaleFactor;
 newExt.ymin = (newExt.ymin + newExt.ymax - height * scaleFactor) / 2;
 newExt.ymax = newExt.ymin + height * scaleFactor;
 newExt.spatialReference = sr;

 // set the MapView's spatialReference to the image's coordinate system
 // and the extent to the extent calculated above
 view = new MapView({
   container: "viewDiv",
   map: map,
   spatialReference: sr,
   extent: newExt
 });
});
getCatalogItemRasterInfo(rasterId, options){Promise<RasterInfo>}
Since: ArcGIS Maps SDK for JavaScript 4.13

Get the raster info of a catalog item in an image service. Each raster catalog item represents a feature in the raster catalog. Each such feature has an associated raster. The image service must have a catalog capability.

Parameters
rasterId Number

Raster catalog id.

options Object
optional

An object with the following properties.

Specification
signal AbortSignal
optional

Signal object that can be used to abort the asynchronous task. The returned promise will be rejected with an Error named AbortError when an abort is signaled. See also AbortController for more information on how to construct a controller that can be used to deliver abort signals.

Returns
Type Description
Promise<RasterInfo> When resolved, a RasterInfo containing info specific to the catalog item is returned.
getSamples(parameters, requestOptions){Promise<ImageSampleResult>}
Since: ArcGIS Maps SDK for JavaScript 4.20

Returns sample point locations, pixel values and corresponding resolutions of the source data for a given geometry. When the input geometry is a polyline, extent, or polygon, the sampling is based on sampleCount or sampleDistance parameters. When the geometry is a point or multipoint, the point or points are used directly.

The number of sample locations in the response is based on the sampleDistance or sampleCount parameter and cannot exceed the limit imposed by the image service. The sample points are located at the intersection of the provided geometry and the raster item's footprints. They are also filtered by the mosaicRule and pixelSize parameters.

Parameters
Autocasts from Object

The parameters used in the getSamples operation.

requestOptions Object
optional

Additional options to be used for the data request (will override requestOptions defined during construction).

Returns
Type Description
Promise<ImageSampleResult> When resolved, ImageSampleResult is returned containing an array of ImageSamples.
Example
// get all sample points along a polyline
// at the specified sample distance and pixel size
const param = {
  geometry: polyline
  returnFirstValueOnly: false,
  // resolution - unit of the view's spatial reference
  pixelSize: {
    x:12,
    y:12,
    spatialReference: view.spatialReference
  },
  interpolation: "nearest",
  // unit of the geometry's spatial reference is used
  sampleDistance: 30,
  outFields: ["*"]
};
imageryLayer.getSamples(param).then((results) => {
  // use the getSamples results as needed.
  console.log(results);
})
.catch(function(error){
  console.log(error)
})
hasEventListener(type){Boolean}inherited

Indicates whether there is an event listener on the instance that matches the provided event name.

Parameter
type String

The name of the event.

Returns
Type Description
Boolean Returns true if the class supports the input event.
hasHandles(groupKey){Boolean}inherited
Since: ArcGIS Maps SDK for JavaScript 4.25

Returns true if a named group of handles exist.

Parameter
groupKey *
optional

A group key.

Returns
Type Description
Boolean Returns true if a named group of handles exist.
Example
// Remove a named group of handles if they exist.
if (obj.hasHandles("watch-view-updates")) {
  obj.removeHandles("watch-view-updates");
}
identify(parameters, requestOptions){Promise<ImageIdentifyResult>}
Since: ArcGIS Maps SDK for JavaScript 4.18

Sends a request to the ArcGIS REST image service to identify content based on the specified ImageIdentifyParameters. If a rendering rule and a mosaic rule are not specified, then the current layer settings will be used.

Parameters
Autocasts from Object

The identify parameters used in the identify operation.

requestOptions Object
optional

Additional options to be used for the data request (will override requestOptions defined during construction).

Returns
Type Description
Promise<ImageIdentifyResult> When resolved, a ImageIdentifyResult is returned.
isFulfilled(){Boolean}inherited

isFulfilled() may be used to verify if creating an instance of the class is fulfilled (either resolved or rejected). If it is fulfilled, true will be returned.

Returns
Type Description
Boolean Indicates whether creating an instance of the class has been fulfilled (either resolved or rejected).
isRejected(){Boolean}inherited

isRejected() may be used to verify if creating an instance of the class is rejected. If it is rejected, true will be returned.

Returns
Type Description
Boolean Indicates whether creating an instance of the class has been rejected.
isResolved(){Boolean}inherited

isResolved() may be used to verify if creating an instance of the class is resolved. If it is resolved, true will be returned.

Returns
Type Description
Boolean Indicates whether creating an instance of the class has been resolved.
load(signal){Promise}inherited

Loads the resources referenced by this class. This method automatically executes for a View and all of the resources it references in Map if the view is constructed with a map instance.

This method must be called by the developer when accessing a resource that will not be loaded in a View.

The load() method only triggers the loading of the resource the first time it is called. The subsequent calls return the same promise.

It's possible to provide a signal to stop being interested into a Loadable instance load status. When the signal is aborted, the instance does not stop its loading process, only cancelLoad can abort it.

Parameter
signal AbortSignal
optional

Signal object that can be used to abort the asynchronous task. The returned promise will be rejected with an Error named AbortError when an abort is signaled. See also AbortController for more information on how to construct a controller that can be used to deliver abort signals.

Returns
Type Description
Promise Resolves when the resources have loaded.
on(type, listener){Object}inherited

Registers an event handler on the instance. Call this method to hook an event with a listener.

Parameters

An event or an array of events to listen for.

listener Function

The function to call when the event fires.

Returns
Type Description
Object Returns an event handler with a remove() method that should be called to stop listening for the event(s).
Property Type Description
remove Function When called, removes the listener from the event.
Example
view.on("click", function(event){
  // event is the event handle returned after the event fires.
  console.log(event.mapPoint);
});
queryObjectIds(query, requestOptions){Promise<number[]>}
Since: ArcGIS Maps SDK for JavaScript 4.21

Executes a Query against the image service and returns an array of Object IDs for the rasters.

Parameters
query Query autocast
optional
Autocasts from Object

Specifies the query parameters. If no parameters are specified, then all Object IDs satisfying the layer's configuration/filters are returned.

requestOptions Object
optional

Additional options to be used for the data request (will override requestOptions defined during construction).

Returns
Type Description
Promise<number[]> When resolved, returns an array of numbers representing the object IDs of the rasters satisfying the query.
queryRasterCount(query, requestOptions){Promise<number>}
Since: ArcGIS Maps SDK for JavaScript 4.21

Executes a Query against the image service and returns the number of rasters that satisfy the query.

Parameters
query Query autocast
optional
Autocasts from Object

Specifies the query parameters. If no parameters are specified, then count of all rasters satisfying the layer's configuration/filters are returned.

requestOptions Object
optional

Additional options to be used for the data request (will override requestOptions defined during construction).

Returns
Type Description
Promise<number> When resolved, returns the number of rasters satisfying the query.
Example
const query = new Query({
  where: "LowPS <= 30"
});

layer.queryRasterCount(query).then(function(result){
  // use the count of rasters
  console.log("queryRasterCount", result)
});
queryRasters(query, requestOptions){Promise<FeatureSet>}
Since: ArcGIS Maps SDK for JavaScript 4.18

Executes a Query against an image service and returns a FeatureSet, which can be accessed using the .then() method once the promise resolves. A FeatureSet contains an array of Graphic features.

Parameters
query Query autocast
Autocasts from Object

Specifies the query parameters. If no parameters are specified, then all features satisfying the layer's configuration/filters are returned.

requestOptions Object
optional

Additional options to be used for the data request (will override requestOptions defined during construction).

Returns
Type Description
Promise<FeatureSet> When resolved, a FeatureSet containing an array of graphics is returned.
Example
let params = new Query({
  // Define query parameters here
});
layer.queryRasters(params).then(function(response){
  // The response is a FeatureSet if results are found
});
redraw()

Executes the pixelFilter function and redraws the layer.

Example
// function defined in layer.pixelFilter is re-executed
layer.redraw();
refresh()
Since: ArcGIS Maps SDK for JavaScript 4.6

Fetches all the data for the layer.

See also
removeHandles(groupKey)inherited
Since: ArcGIS Maps SDK for JavaScript 4.25

Removes a group of handles owned by the object.

Parameter
groupKey *
optional

A group key or an array or collection of group keys to remove.

Example
obj.removeHandles(); // removes handles from default group

obj.removeHandles("handle-group");
obj.removeHandles("other-handle-group");
when(callback, errback){Promise}inherited
Since: ArcGIS Maps SDK for JavaScript 4.6

when() may be leveraged once an instance of the class is created. This method takes two input parameters: a callback function and an errback function. The callback executes when the instance of the class loads. The errback executes if the instance of the class fails to load.

Parameters
callback Function
optional

The function to call when the promise resolves.

errback Function
optional

The function to execute when the promise fails.

Returns
Type Description
Promise Returns a new promise for the result of callback that may be used to chain additional functions.
Example
// Although this example uses MapView, any class instance that is a promise may use when() in the same way
let view = new MapView();
view.when(function(){
  // This function will execute once the promise is resolved
}, function(error){
  // This function will execute if the promise is rejected due to an error
});

Type Definitions

PixelData

An object that provides the user access to pixels and their values in the layer. See the object specifications table below for details about each property. This object is used as input in the pixelFilter() function for filtering and processing each pixel in the block.

Properties
extent Extent

The extent of the pixelBlock.

pixelBlock PixelBlock

An object representing the pixels in the view. This provides the user access to each pixel on the client via the pixels property of this object.

PixelFilterFunction(pixelData)

Function definition for the pixelFilter property. See the example snippet in the pixelFilter documentation for more details.

Parameter
pixelData PixelData

An object that provides the user access to pixels in and their values in the layer.

RasterBandStatistics Object
Since: ArcGIS Maps SDK for JavaScript 4.18

Raster statistics information returned that meets the specified ImageHistogramParameters from the computeStatisticsHistograms() method.

Properties
min Number

Minimum value of the statistics.

max Number

Maximum value of the statistics.

avg Number

Average of the statistics.

stddev Number

Standard deviation of the statistics.

RasterFunctionInfo Object
Since: ArcGIS Maps SDK for JavaScript 4.22

The raster function published with the image service.

Properties
name String

Name of the raster function.

description String

Description of the raster function.

help String

Additional info describing what the raster function does.

functionType Number

The function type. Possible values: //0 = Mosaic, 1 = Item, 2 = Item Group.

thumbnail String

Inline base64 encoded thumbnail of the raster function.

RasterHistogram Object
Since: ArcGIS Maps SDK for JavaScript 4.18

Raster histogram information returned that meets the specified ImageHistogramParameters from the computeHistograms() or computeStatisticsHistograms() method.

Properties
size Number

Number of bins.

min Number

The minimum pixel value of the histogram. Matches the minimum bound of the first bin.

max Number

The maximum pixel value of the histogram. Matches the maximum bound of the last bin.

Count of pixels that fall into each bin.

Event Overview

Show inherited events Hide inherited events
Name Type Summary Class
{view: View,layerView: LayerView}

Fires after the layer's LayerView is created and rendered in a view.

more details
Layer
{view: View,error: Error}

Fires when an error emits during the creation of a LayerView after a layer has been added to the map.

more details
Layer
{view: View,layerView: LayerView}

Fires after the layer's LayerView is destroyed and no longer renders in a view.

more details
Layer
{dataChanged: Boolean}

Fires if the layer has the refreshInterval set or when refresh() method is called.

more details
ImageryLayer

Event Details

layerview-createinherited

Fires after the layer's LayerView is created and rendered in a view.

Properties
view View

The view in which the layerView was created.

layerView LayerView

The LayerView rendered in the view representing the layer in layer.

See also
Example
// This function will fire each time a layer view is created for this
// particular view.
layer.on("layerview-create", function(event){
  // The LayerView for the layer that emitted this event
  event.layerView;
});
layerview-create-errorinherited

Fires when an error emits during the creation of a LayerView after a layer has been added to the map.

Properties
view View

The view that failed to create a layerview for the layer emitting this event.

error Error

An error object describing why the layer view failed to create.

See also
Example
// This function fires when an error occurs during the creation of the layer's layerview
layer.on("layerview-create-error", function(event) {
  console.error("LayerView failed to create for layer with the id: ", layer.id, " in this view: ", event.view);
});
layerview-destroyinherited

Fires after the layer's LayerView is destroyed and no longer renders in a view.

Properties
view View

The view in which the layerView was destroyed.

layerView LayerView

The destroyed LayerView representing the layer.

refresh
Since: ArcGIS Maps SDK for JavaScript 4.21

Fires if the layer has the refreshInterval set or when refresh() method is called. The event payload indicates if the layer's data has changed.

Property
dataChanged Boolean

Indicates if the layer's data has changed.

See also
Example
// listen to layer's refresh event to fetch the attachments
// for the updated features.
layer.on("refresh", function(event){
  if (event.dataChanged){
    const query = layer.createQuery();
    layer.queryObjectIds(query).then(function (objectIds) {
      let attachmentQuery = {
        objectIds: objectIds,
        definitionExpression: layer.definitionExpression,
        attachmentTypes: ["image/jpeg"]
      };
      layer.queryAttachments(attachmentQuery).then(function (attachments) {
        attachmentQuery.objectIds.forEach(function (objectId) {
          if (attachments[objectId]) {
            // process the updated attachments
            let attachment = attachments[objectId];
          }
        });
      })
      .catch(function (error) {
        console.log("attachment query error", error);
      });
    });
  }
});

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