WCSLayer

AMD: require(["esri/layers/WCSLayer"], (WCSLayer) => { /* code goes here */ });
ESM: import WCSLayer from "@arcgis/core/layers/WCSLayer";
Class: esri/layers/WCSLayer
Inheritance: WCSLayer Layer Accessor
Since: ArcGIS API for JavaScript 4.17
beta

WCS presents raster data from a OGC Web Coverage Service. Raster data are projected and rendered on the client-side. It supports versions 1.0.0, 1.1.0, 1.1.1, 1.1.2 and 2.0.1. For version 2.0.1, it supports servers that support GEOTIFF coverage and implements the following extensions: Scaling, Interpolation, Range Subsetting, CRS, and KVP/Get.

To avoid cross-origin issues when using WCSLayer, you may set up a CORS enabled server or a proxy. ArcGIS Server (10.3.1+) image service based WCSLayers have CORS enabled by default.

See also:

Constructors

new WCSLayer(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 WCSLayer({
  url: "https://sampleserver6.arcgisonline.com/arcgis/services/ScientificData/SeaTemperature/ImageServer/WCSServer"
});

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[]more details

Defines a band combination using 0-based band indexes.

more detailsWCSLayer
Stringmore details

The copyright text as defined by the service.

more detailsWCSLayer
Stringmore details

The coverage identifier for the layer.

more detailsWCSLayer
Objectmore details

Use this property to append custom parameters to all WCS requests.

more detailsWCSLayer
Stringmore details

The name of the class.

more detailsAccessor
Field[]more details

An array of raster fields in the layer that consists of service pixel value.

more detailsfields
Extentmore details

The full extent of the layer.

more detailsLayer
Stringmore details

The unique ID assigned to the layer.

more detailsLayer
Stringmore details

Defines how to interpolate pixel values.

more detailsWCSLayer
Stringmore details

Indicates how the layer should display in the LayerList widget.

more detailsLayer
Booleanmore details

Indicates whether the layer's resources have loaded.

more detailsLayer
Errormore details

The Error object returned if an error occurred while loading.

more detailsLayer
Stringmore details

Represents the status of a load operation.

more detailsLayer
Object[]more details

A list of warnings which occurred while loading.

more detailsLayer
Numbermore details

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

more detailsWCSLayer
Numbermore details

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

more detailsWCSLayer
DimensionalDefinition[]more details

The multidimensional definitions associated with the layer.

more detailsWCSLayer
Numbermore details

The opacity of the layer.

more detailsLayer
PortalItemmore details

The portal item from which the layer is loaded.

more detailsWCSLayer
RasterInfomore details

Raster information retrieved from data source.

more detailsWCSLayer
ClassBreaksRenderer|RasterStretchRenderermore details

The renderer assigned to the layer.

more detailsWCSLayer
Stringmore details

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

more detailsLayer
Stringmore details For WCSLayer the type is always "wcs". more detailsWCSLayer
Stringmore details

The URL of the REST endpoint of the layer.

more detailsWCSLayer
Stringmore details

The version of Web Coverage Service currently being used.

more detailsWCSLayer
Booleanmore details

Indicates if the layer is visible in the View.

more detailsLayer

Property Details

bandIds Number[]

Defines a band combination using 0-based band indexes.

The copyright text as defined by the service.

coverageId String

The coverage identifier for the layer. It defaults to the first coverage.

customParameters Object

Use this property to append custom parameters to all WCS requests. The custom parameters are applied to GetCapabilities, DescribeCoverage, GetCoverage operations of WCS services.

Example:
// request for particular images in a mosaic dataset
// Numbers are the object IDs of the image service catalog table
layer.customParameters = {images: "1,2,3"};
declaredClass Stringreadonly inherited

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

fields Field[]inner

An array of raster fields in the layer that consists of service pixel value.

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;
});

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

interpolation String

Defines how to interpolate pixel values.

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

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;
multidimensionalDefinition DimensionalDefinition[]
Since: ArcGIS API for JavaScript 4.20

The multidimensional definitions associated with the layer. If defined, the multidimensional definitions contain various dimensions of data for a particular value, such as time, depth, altitude, etc. Use the multidimensionalDefinition to define a slice to be displayed by the layer. For example, you can display a particular variable such as temperature or salinity measured at a fixed dimension (e.g. time, depth). These data types are commonly used in atmospheric, oceanographic, and earth sciences.

See also:
Examples:
// set the `multidimensionalDefinition` to visualize a sea water
// temperature at -5000m on April 7th 2014.
const dimension = [
  {
     variableName: "temperature",
     dimensionalName: "Std_Time",
     values: [1396828800000]
  },
  {
     variableName: "temperature",
     dimensionalName:"Std_Z",
     values:[-5000]
  }
];
layer.multidimensionalDefinition = dimension;
// get the layer's multidimensionalDefinition and locate the
// Salinity dimension and filter the data by salinity.
const multidimensionalDefinition = layer.multidimensionalDefinition;
const variableName =  "Salinity";
// filter the data by salinity dimension
multidimensionalDefinition.forEach((def) => def.variableName = variableName);
layer.multidimensionalDefinition = multidimensionalDefinition;

// update the statistics of the layer's stretch renderer.
const renderer = layer.renderer.clone();
const dimensions = layer.rasterInfo.multidimensionalInfo;
// get the salinity variable's statistics
const salinity = dimensions.variables.find((variable) => variable.name === variableName);
renderer.statistics = salinity.statistics;
layer.renderer = renderer;
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;
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 lyr = 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 lyr = new FeatureLayer({
  portalItem: {  // autocasts as new PortalItem()
    id: "8d26f04f31f642b6828b7023b84c2188"
  },
  // loads the third item in the given feature service
  layerId: 2
});
// 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);
  }
});
rasterInfo RasterInforeadonly
Since: ArcGIS API for JavaScript 4.19

Raster information retrieved from data source.

The renderer assigned to the layer. The renderer defines how to visualize pixels in the WCSLayer. Depending on the renderer type, the pixels may be stretched across the color ramp or classified.

See also:

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.

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 WCSLayer the type is always "wcs".

url String

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

version String

The version of Web Coverage Service currently being used. The supported versions are: 1.0.0, 1.1.0, 1.1.1, 1.1.2 and 2.0.1.

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
more details

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

more detailsLayer
Promise<LayerView>more details

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 detailsLayer
PopupTemplatemore details

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

more detailsWCSLayer
more details

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

more detailsLayer
Booleanmore details

Emits an event on the instance.

more detailsLayer
Promise<Object>more details

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

more detailsLayer
Promise<Object>more details

Fetches pixels for a given extent.

more detailsWCSLayer
Promise<Object>more details

This method fetches a tile for the given level, row and column present in the view.

more detailsWCSLayer
Booleanmore details

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

more detailsLayer
Promise<Object>more details

Identify pixel values at a given location.

more detailsWCSLayer
Booleanmore details

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

more detailsLayer
Booleanmore details

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

more detailsLayer
Booleanmore details

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

more detailsLayer
Promisemore details

Loads the resources referenced by this class.

more detailsLayer
Objectmore details

Registers an event handler on the instance.

more detailsLayer
Promisemore details

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

more detailsLayer

Method Details

cancelLoad()inherited

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

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}

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

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

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.
fetchPixels(extent, width, height, options){Promise<Object>}
Since: ArcGIS API for JavaScript 4.19

Fetches pixels for a given extent.

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 pixels including PixelBlock. The pixelBlock contains the value of each pixel in the image.
fetchTile(level, row, col, options){Promise<Object>}

This method fetches a tile for the given level, row and column present in the view.

Parameters:
level Number

Level of detail of the tile to fetch. This value is provided by LayerView.

row Number

The row(y) position of the tile fetch. This value is provided by LayerView.

col Number

The column(x) position of the tile to fetch. This value is provided by LayerView.

options Object
optional

Optional settings for the tile request.

Returns:
Type Description
Promise<Object> Returns a promise that resolves to an object containing pixsel block and source extent
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.
identify(point, options){Promise<Object>}

Identify pixel values at a given location. It identifies the content of an image service for the input location and in specified dimensional definitions.

Parameters:
point Point

Input point that defines the location to be identified.

optional
Autocasts from Object

Optional settings for the identify request.

Returns:
Type Description
Promise<Object> Returns a promise that resolves to a RasterIdentifyResult containing a location and pixel values.
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. See the Events summary table for a list of supported events.

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);
});
when(callback, errback){Promise}inherited

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
});

Event Overview

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

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

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

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}
more details

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

more details Layer

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.

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