VoxelLayer | API Reference | ArcGIS Maps SDK for JavaScript 4.32

Overview
Creating a VoxelLayer
Data Visualization
Exploring a Voxel Layer
VoxelLayer Volume
VoxelLayer and time

Overview

A voxel layer represents multidimensional volumetric data. For example, atmospheric or oceanic data, geological underground models, or space-time cubes can be visualized as voxel layer. The VoxelLayer can be visualized in a SceneView with the viewingMode set to local.

Use voxel layers to explore spatial relationships with other content. For example, an underground model visualized as a voxel layer can be viewed together with buildings or subterrain utilities to evaluate the underground for planned construction or maintenance.

voxel-layer

Known Limitations

VoxelLayer requires the EXT_color_buffer_float extension.
Visualizing voxels with data type INT16 or UINT16 additionally requires the EXT_texture_norm16 extension, which is currently only supported by the Chrome browser.
Visualizing voxels with data type FLOAT32 additionally requires the OES_texture_float_linear extension.
For best performance, use Chrome browser and a dedicated graphics card.
Mobile support differs across devices. Voxel scene layers are not recommended for use on mobile.
Measurement widget for both distance and area allows you to choose a point in a voxel layer. However, the point selection and measurement may not be accurate.

Creating a VoxelLayer

From ArcGIS Pro, you can author a voxel layer and publish it as a Scene Service. Scene Services can be hosted on ArcGIS Online or ArcGIS Enterprise by uploading a Scene Layer Package (.slpk) or by sharing it from ArcGIS Pro.

The Scene Service is identified by a service URL or portal item ID and can be used to create an instance of a VoxelLayer.

Reference a service URL

To create a VoxelLayer instance from a service, you must set the url property to the REST endpoint of a VoxelLayer. For a layer to be visible in a view, it must be added to the Map.

const voxelLayer = new VoxelLayer({
   url: "https://tiles.arcgis.com/tiles/z2tnIkrLQ2BRzr6P/arcgis/rest/services/EMU_Caribbean_Voxel/SceneServer"
});
const map = new Map({
   layers: [voxelLayer],
   basemap: {
     baseLayers: [
       new VectorTileLayer({
         url: "https://basemaps.arcgis.com/arcgis/rest/services/OpenStreetMap_GCS_v2/VectorTileServer"
       })
     ]
   }
});

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

Reference an ArcGIS portal Item ID

You can also create a VoxelLayer from the portal item ID.

const voxelLayer = new VoxelLayer({
   portalItem: {
     id: "3a922ed0c7a8489ea4fbe8747ac560ba"
   },
});

Data Visualization

Voxel layers can be visualized as volumes or surfaces using the property renderMode. When set to surfaces, only isosurfaces and sections are displayed, whereas volume draws the full volume.

A voxel layer contains variables representing continuous or discrete data. For example, permeability could be defined as a continuous variable and soil type as a discrete variable. Voxel layer only visualizes one variable at a time. A VoxelVariable describes a single variable in the VoxelLayer. The currentVariableId controls which variable is being rendered.

You can define how a continuous or discrete variable can be rendered. You can apply a data filter to, modify the color scheme of, or add transparency to a continuous variable by using VoxelTransferFunctionStyle. For a discrete variable, you can modify the color and label by using uniqueValues.

Exploring a Voxel Layer

Voxel layers often cover large areas. There are various capabilities you can use to explore the voxel layer in detail.

VoxelSlice

Use VoxelSlice to define an area of interest. You can slice a voxel layer vertically to show a smaller volume, or horizontally slice to reduce the voxel layer to a specific height.

It is possible to have multiple slices in a VoxelLayer by modifying the VoxelVolumeStyle's slices or by authoring slices in ArcGIS Pro before publishing the voxel layer as a scene service.

Slices modified using VoxelVolumeStyle's slices and the slices authored from ArcGIS Pro are persistent in the web scene or layer definition respectively.

Position, tilt and orientation of a VoxelSlice can be modified with real-time rendering updates.

voxellayer_voxelslice

VoxelDynamicSection

A section is a plane which cuts through a voxel volume. Sections can reveal valuable information, such as soil composition and contamination across a subsurface profile. The VoxelDynamicSection allows you to define the properties of an individual dynamic section. You can create VoxelDynamicSection to understand structures in the voxel layer. For example, you can create a cross section diagram to explore an underground model at locations where new construction is planned. VoxelDynamicSection can only be visualized when the renderMode is set to surfaces.

Position, tilt and orientation of a VoxelDynamicSection can be modified with real-time rendering updates.

voxellayer_dynamicsection

VoxelIsosurface

A VoxelIsosurface is a surface representing a specific value within a continuous variable. For example, you can visualize a threshold value for pollutants in the atmosphere as an isosurface. This allows you to identify the location of key values. You can visualize isosurfaces together with sections. VoxelIsosurface can only be visualized when the renderMode is set to surfaces.

By default, the color of an isosurface matches the color in the colorStops for the specific value. You can choose a different color and lock the color by using the property colorLocked in VoxelIsosurface. You can have up to four isosurfaces in a voxel layer.

voxellayer_isosurface

Analysis Tool

The Slice, DirectLineMeasurement3D and AreaMeasurement3D works with VoxelLayer.

Slice

The VoxelLayer treats the slice as an infinite plane and ignores the slice plane extent.

Slice widget allows you to interactively modify a single slice. The visualization created using the Slice widget are temporary and cannot be persisted in a WebScene or in slides.

Below is a comparison between the VoxelSlice and the Slice widget.

	VoxelSlice	Slice widget
Persisted	yes	no
Editable	yes (by modifying the properties of the VoxelSlice)	yes
Multiple slices	yes (by modifying VoxelVolumeStyle's slices)	no

Measurement

The DirectLineMeasurement3D and AreaMeasurement3D allows you to select points in the VoxelLayer to measure. However, the selection of the points and the measurement results may not be accurate. The measurement results include the verticalExaggeration applied to the VoxelLayer.

Popup

You can explore the properties of individual voxels by creating a customized popup using the popupTemplate. Use the fields to list all available fields that can be used to customize the popup of a VoxelLayer.

VoxelLayer Volume

The voxel layer is structured in dimensional regularly gridded cubes that store one or many variables.

A voxel layer can represent different dimensions. The volumeType property in VoxelVolume defines the dimension of the voxel layer.

X, Y, Z in which each dimension represents a geographic coordinate

voxellayer_xyz

X, Y, T in which X and Y represent a geographic coordinate and T represents time as a level

voxellayer_xyt

X, Y, Z, T in which each dimension represents geographic coordinates and includes a fourth dimension representing time.

voxellayer_xyzt

VoxelLayer and time

A VoxelLayer enables the visualization of time as the fourth dimension if the volumeType is "xyzt". A volumeType of "xyt" is not a time-aware layer. The time is represented along the z dimension.

You can access the temporal data of a VoxelLayer by using the stops in the TimeInfo. The stops indicates time instants that a layer has data for. You can use the stops with the TimeSlider widget or use it to configure the VoxelLayer's timeExtent.

The layer and the view can have a different TimeExtent. The useViewTime determines if the VoxelLayer will show the data based on the view's timeExtent or the layer's timeExtent.

The table below shows an example of how the VoxelLayer chooses the data to draw when the useViewTime is used in conjunction with the view's and the layer's timeExtent.

For example, a VoxelLayer has the following stops on the timeInfo:

[0] 2019-06-01 12:00 AM

[1] 2019-07-01 12:00 AM

[2] 2019-08-01 12:00 AM

useViewTime	view's timeExtent	VoxelLayer's timeExtent	VoxelLayer will draw the data
true	not set	not set	[0] 2019-06-01 12:00 AM
true	not set	From 2019-07-01 12:00 AM to 2019-07-01 12:00 AM	[1] 2019-07-01 12:00 AM
true	From 2019-06-15 12:00 AM to 2019-07-15 12:00 AM	not set	[1] 2019-07-01 12:00 AM
true	From 2019-06-15 12:00 AM to 2019-07-15 12:00 AM	From 2019-08-01 12:00 AM to 2019-08-01 12:00 AM	VoxelLayer will not draw because the view's timeExtent does not intersect the VoxelLayer's timeExtent
false	not set	not set	[0] 2019-06-01 12:00 AM
false	not set	From 2019-07-01 12:00 AM to 2019-07-01 12:00 AM	[1] 2019-07-01 12:00 AM
false	From 2019-06-15 12:00 AM to 2019-07-15 12:00 AM	not set	[0] 2019-06-01 12:00 AM
false	From 2019-06-15 12:00 AM to 2019-07-15 12:00 AM	From 2019-08-01 12:00 AM to 2019-08-01 12:00 AM	[2] 2019-08-01 12:00 AM

See also

Constructors

VoxelLayer Constructor new VoxelLayer(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 VoxelLayer({
// URL to the service
url: "your voxel service url"
});

Property Overview

Any properties can be set, retrieved or listened to. See the Watch for changes topic.

Show inherited properties

Hide inherited properties

Type	Summary	Class
String\|null\|undefined	An authorization string used to access a resource or service.	VoxelLayer
String\|null\|undefined	The copyright text as defined by the scene service.	VoxelLayer
Number	The variable that is being displayed.	VoxelLayer
Object\|null\|undefined	A list of custom parameters appended to the URL of all resources fetched by the layer.	VoxelLayer
String	The name of the class.	Accessor
Boolean	Controls whether or not to globally disable all dynamic sections in the current VoxelVolumeStyle.	VoxelLayer
Boolean	Controls whether or not to globally disable all isosurfaces in the current VoxelVariableStyle.	VoxelLayer
Boolean	Controls whether or not to globally disable all slices in the current VoxelVolumeStyle.	VoxelLayer
Field []	A complete list of fields that consists of fixed voxel fields and the voxel variables.	VoxelLayer
Extent\|null\|undefined	The full extent of the layer.	Layer
String	The unique ID assigned to the layer.	Layer
Number	The layer ID, or layer index, of a Scene Service layer.	VoxelLayer
Boolean	Indicates whether the layer will be included in the legend.	VoxelLayer
String	Indicates how the layer should display in the LayerList widget.	Layer
Error\|null\|undefined	The Error object returned if an error occurred while loading.	Layer
String	Represents the status of a load operation.	Layer
Object []	A list of warnings which occurred while loading.	Layer
Boolean	Indicates whether the layer's resources have loaded.	Layer
Number	The maximum scale (most zoomed in) at which the layer is visible in the view.	VoxelLayer
Number	The minimum scale (most zoomed out) at which the layer is visible in the view.	VoxelLayer
Map\|Basemap\|Ground\|GroupLayer\|CatalogDynamicGroupLayer\|CatalogLayer\|null\|undefined	The parent to which the layer belongs.	Layer
Boolean	Enable persistence of the layer in a WebMap or WebScene.	VoxelLayer
Boolean	Indicates whether to display popups when voxels in the layer are clicked.	VoxelLayer
PopupTemplate\|null\|undefined	The popup template for the layer.	VoxelLayer
PortalItem\|null\|undefined	The portal item from which the layer is loaded.	VoxelLayer
String	Current rendering mode for the VoxelLayer.	VoxelLayer
SpatialReference	The spatial reference of the layer.	VoxelLayer
TimeExtent\|null\|undefined	The layer's time extent.	VoxelLayer
TimeInfo\|null\|undefined	TimeInfo provides information such as stops the layer has data for and the fullTimeExtent for the layer.	VoxelLayer
TimeInterval\|null\|undefined	A temporary offset of the time data based on a certain TimeInterval.	VoxelLayer
String\|null\|undefined	The title of the layer used to identify it in places such as the LayerList widget.	Layer
String	For VoxelLayer the type is always "voxel".	VoxelLayer
String\|null\|undefined	The URL of the REST endpoint of the layer or scene service.	VoxelLayer
Boolean	Determines if the layer will update its temporal data based on the view's timeExtent.	VoxelLayer
Collection<VoxelVariableStyle>	The collection of variable styles, containing exactly one VoxelVariableStyle for each VoxelVariable.	VoxelLayer
Collection<VoxelVariable>	The collection of variables that the VoxelLayer has data for.	VoxelLayer
Object	The version of the scene service specification used for this service.	VoxelLayer
TimeExtent\|null\|undefined	Specifies a fixed time extent during which a layer should be visible.	Layer
Boolean	Indicates if the layer is visible in the View.	Layer
Collection<VoxelVolumeStyle>	The collection of volume styles.	VoxelLayer
Collection<VoxelVolume>	The collection of volumes that the VoxelLayer has variables for.	VoxelLayer

Property Details

apiKey Property apiKey String |null |undefined

An authorization string used to access a resource or service. API keys are generated and managed in the portal. An API key is tied explicitly to an ArcGIS account; it is also used to monitor service usage. Setting a fine-grained API key on a specific class overrides the global API key.

Known Limitations

API key authentication is currently not supported for ArcGIS Enterprise users.

Example

// set the api key to access a protected service
const layer = new FeatureLayer({
  url: serviceUrl,
  apiKey: "YOUR_API_KEY"
});

copyright Property copyright String |null |undefined

The copyright text as defined by the scene service.

currentVariableId Property currentVariableId Number Since: ArcGIS Maps SDK for JavaScript 4.24 VoxelLayer since 4.22, currentVariableId added at 4.24.

The variable that is being displayed. The currentVariableId must be the id of a VoxelVariable that is in the variables collection of the VoxelLayer.

Default Value:0

customParameters Property customParameters Object |null |undefined

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. The layer's refresh() method needs to be called if the customParameters are updated at runtime.

Example

// send a custom parameter to your special service
let layer = new MapImageLayer({
  url: serviceUrl,
  customParameters: {
    "key": "my-special-key"
  }
});

declaredClass Inherited Property declaredClass Stringreadonly Inherited from Accessor

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

enableDynamicSections Property enableDynamicSections Boolean Since: ArcGIS Maps SDK for JavaScript 4.25 VoxelLayer since 4.22, enableDynamicSections added at 4.25.

Controls whether or not to globally disable all dynamic sections in the current VoxelVolumeStyle.

enableIsosurfaces Property enableIsosurfaces Boolean Since: ArcGIS Maps SDK for JavaScript 4.25 VoxelLayer since 4.22, enableIsosurfaces added at 4.25.

Controls whether or not to globally disable all isosurfaces in the current VoxelVariableStyle.

enableSlices Property enableSlices Boolean Since: ArcGIS Maps SDK for JavaScript 4.25 VoxelLayer since 4.22, enableSlices added at 4.25.

Controls whether or not to globally disable all slices in the current VoxelVolumeStyle.

fields Property fields Field[]readonly Since: ArcGIS Maps SDK for JavaScript 4.31 VoxelLayer since 4.22, fields added at 4.31.

A complete list of fields that consists of fixed voxel fields and the voxel variables. This list is used for the layer's popupTemplate.

The fixed voxel fields used in popups represent the voxel's position, current variable being displayed, depth and time. These fields are prefixed with Voxel. to indicate that they are special fields and to avoid any potential conflict with voxel variable fields.

Below is a list of fixed fields that exists for all VoxelLayer depending on the voxel's volume.

Fixed voxel fields

The Voxel.CurrentVariable field returns the current variable being displayed.
The Voxel.Position field returns the clicked voxel's position.
The Voxel.Depth field returns the depth of the clicked voxel. (Only applicable for XYZ and XYZT volumeType).
The Voxel.LocalTime field returns the local date and/or time of the clicked voxel if the VoxelLayer has a time dimension. (Only applicable for XYT and XYZT volumeType).
The Voxel.SourceTime field returns the source time of the clicked voxel if the VoxelLayer has a time dimension. (Only applicable for XYT and XYZT volumeType).

Example

layer.when(() => {
  // print out field names returned in layer.fields
  layer.fields.forEach((field) => {
    console.log(field.name);
  });
});

fullExtent Inherited Property fullExtent Extent |null |undefinedautocast Inherited from Layer

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;
});

id Inherited Property id String Inherited from Layer

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

layerId Property layerId Number

The layer ID, or layer index, of a Scene Service layer. This is particularly useful when loading a single layer with the portalItem property from a service containing multiple layers. You can specify this value in one of two scenarios:

When loading the layer via the portalItem property.
When pointing the layer url directly to the Scene Service.

If a layerId is not specified in either of the above scenarios, then the first layer in the service (layerId = 0) is selected.

Examples

// while these examples use a SceneLayer, the same pattern can be
// used for other layers that may be loaded from portalItem ids

// loads the third layer in the given Portal Item
let layer = new SceneLayer({
  portalItem: {
    id: "73df987984b24094b848d580eb83b0fb"
  },
  layerId: 2
});

// If not specified, the first layer (layerId: 0) will be returned
let layer = new SceneLayer({
  portalItem: {
    id: "73df987984b24094b848d580eb83b0fb"
  }
});

// Can also be used if URL points to service and not layer
let layer = new SceneLayer({
  url: "https://scenesampleserverdev.arcgis.com/arcgis/rest/services/Hosted/DevA_Trees/SceneServer",
  layerId: 0  // Notice that the url doesn't end with /2
});

// This code returns the same layer as the previous snippet
let layer = new SceneLayer({
  url: "https://scenesampleserverdev.arcgis.com/arcgis/rest/services/Hosted/DevA_Trees/SceneServer/layers/0",
  // The layer id is specified in the URL
});

legendEnabled Property legendEnabled Boolean

Indicates whether the layer will be included in the legend.

Default Value:true

listMode Inherited Property listMode String Inherited from Layer

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, SubtypeGroupLayer, TileLayer, or WMSLayer, hide the children layers from the table of contents.

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

Default Value:"show"

loadError Inherited Property loadError Error |null |undefinedreadonly Inherited from Layer

The Error object returned if an error occurred while loading.

Default Value:null

loadStatus Inherited Property loadStatus Stringreadonly Inherited from Layer

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 Inherited Property loadWarnings Object[]readonly Inherited from Layer

A list of warnings which occurred while loading.

loaded Inherited Property loaded Booleanreadonly Inherited from Layer

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

Default Value:false

maxScale Property 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 Property 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;

The parent to which the layer belongs.

persistenceEnabled Property persistenceEnabled Boolean Since: ArcGIS Maps SDK for JavaScript 4.28 VoxelLayer since 4.22, persistenceEnabled added at 4.28.

Enable persistence of the layer in a WebMap or WebScene.

Default Value:true

popupEnabled Property popupEnabled Boolean Since: ArcGIS Maps SDK for JavaScript 4.26 VoxelLayer since 4.22, popupEnabled added at 4.26.

Indicates whether to display popups when voxels in the layer are clicked. The layer needs to have a popupTemplate to define what information should be displayed in the popup. Alternatively, a default popup template may be automatically used if Popup.defaultPopupTemplateEnabled is set to true.

Default Value:false

popupTemplate Property popupTemplate PopupTemplate |null |undefinedautocast Since: ArcGIS Maps SDK for JavaScript 4.31 VoxelLayer since 4.22, popupTemplate added at 4.31.

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 voxel is clicked. See this sample for an example of how PopupTemplate interacts with a VoxelLayer.

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

See also

portalItem Property portalItem PortalItem |null |undefinedautocast

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);
  }
});

renderMode Property renderMode String Since: ArcGIS Maps SDK for JavaScript 4.24 VoxelLayer since 4.22, renderMode added at 4.24.

Current rendering mode for the VoxelLayer. The volume mode draws the full voxel layer volume whereas the surfaces mode draws dynamic sections and isosurfaces only.

Possible Values:"volume" |"surfaces"

Default Value:"volume"

spatialReference Property spatialReference SpatialReferenceautocast

The spatial reference of the layer.

timeExtent Property timeExtent TimeExtent |null |undefinedautocaststatic Since: ArcGIS Maps SDK for JavaScript 4.30 VoxelLayer since 4.22, timeExtent added at 4.30.

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. You can choose the layer's time extent from the voxel layer's timeInfo.stops.

Example

// Configure the layer to ignore the view's time and instead
// draw using the data from its last time stop
vxlLayer.useViewTime = false;
const lastStopTime = vxlLayer.timeInfo.stops.at(-1);
vxlLayer.timeExtent = new TimeExtent({
   start: lastStopTime,
   end: lastStopTime,
});

timeInfo Property timeInfo TimeInfo |null |undefinedreadonly Since: ArcGIS Maps SDK for JavaScript 4.30 VoxelLayer since 4.22, timeInfo added at 4.30.

TimeInfo provides information such as stops the layer has data for and the fullTimeExtent for the layer.

Default Value:null

Example

// Configure the timeSlider to use the layer's timeInfo.stops
const vxlLayer = new VoxelLayer({
   url: url,
});
const map = new Map({
   layers: [vxlLayer]
});
const view = new SceneView({
   map: map,
   container: "viewDiv"
});
const timeSlider = new TimeSlider({
   container: "timeSlider",
   view: view,
   mode: "instant",
   playRate: 3000
});
view.whenLayerView(vxlLayer).then((vxlLayerView) => {
   timeSlider.fullTimeExtent = vxlLayer.timeInfo.fullTimeExtent;
   timeSlider.stops = {
     dates: vxlLayer.timeInfo.stops
   };
});

timeOffset Property timeOffset TimeInterval |null |undefinedautocaststatic Since: ArcGIS Maps SDK for JavaScript 4.30 VoxelLayer since 4.22, timeOffset added at 4.30.

A temporary offset of the time data based on a certain TimeInterval. This allows users to overlay data 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 data shown in popups are not affected by the offset.

Example

// Offset a Voxel layer, adding 2 years
let vxlLayer = new VoxelLayer({
   url: url,
   timeOffset: {
     unit: "years",
     value: 2
   }
})

title Inherited Property title String |null |undefined Inherited from Layer

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 Property type Stringreadonly

For VoxelLayer the type is always "voxel".

url Property url String |null |undefined

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

The layer may be specified using the layerId property when the url points directly to a service and not a specific layer. If layerId is not specified, then it will default to the first layer in the service.

Examples

// Layer from Scene Service on ArcGIS Server
let sceneLayer = new SceneLayer({
  url: "https://services.arcgis.com/V6ZHFr6zdgNZuVG0/arcgis/rest/services/Paris_3D_Local_WSL2/SceneServer/layers/0"
});

// Can also be used if URL points to service and not layer
let layer = new SceneLayer({
  // Notice that the url doesn't end with /0
  url: "https://scenesampleserverdev.arcgis.com/arcgis/rest/services/Hosted/DevA_Trees/SceneServer",
  layerId: 0
});

useViewTime Property useViewTime Booleanautocaststatic Since: ArcGIS Maps SDK for JavaScript 4.30 VoxelLayer since 4.22, useViewTime added at 4.30.

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 data 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 the data between 1970 and 1975 and the view has a time extent set to 1972-1980, the effective time on the voxel layer will be 1972-1975.

Default Value:true

Example

if (vxlLayer.useViewTime) {
   console.log("Displaying data between:", view.timeExtent.start, " - ", view.timeExtent.end)
}

variableStyles Property variableStyles Collection<VoxelVariableStyle>autocast Since: ArcGIS Maps SDK for JavaScript 4.25 VoxelLayer since 4.22, variableStyles added at 4.25.

The collection of variable styles, containing exactly one VoxelVariableStyle for each VoxelVariable.

variables Property variables Collection<VoxelVariable>readonly Since: ArcGIS Maps SDK for JavaScript 4.24 VoxelLayer since 4.22, variables added at 4.24.

The collection of variables that the VoxelLayer has data for.

version Property version Objectreadonly

The version of the scene service specification used for this service.

Properties

major Number

The major version of the scene layer.

minor Number

The minor version of the scene layer.

versionString String

The complete version string of the scene layer.

See also

https://github.com/Esri/i3s-spec

Example

// Prints the version to the console - e.g. 1.4, 1.5, etc.
console.log(layer.version.versionString);

visibilityTimeExtent Inherited Property visibilityTimeExtent TimeExtent |null |undefinedautocast Inherited from Layer Since: ArcGIS Maps SDK for JavaScript 4.30 Layer since 4.0, visibilityTimeExtent added at 4.30.

Specifies a fixed time extent during which a layer should be visible. This property can be used to configure a layer that does not have time values stored in an attribute field to work with time. Once configured, the TimeSlider widget will display the layer within the set time extent. In the case that only one of the start or end date values are available, the layer remains visible indefinitely in the direction where there is no time value.

Aerial imagery can capture seasonal variations in vegetation, water bodies, and land use patterns. For example, in agricultural regions, aerial imageries taken during different growing seasons provide insights into crop health and productivity. Defining a fixed time extent on imageries from specific time periods provides temporal context and facilitates focused analysis based on specific time periods or events.

Default Value:null

See also

Sample - GraphicsLayer with visibilityTimeExtent

visible Inherited Property visible Boolean Inherited from Layer

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;

// Watch for changes in the layer's visibility
// and set the visibility of another layer when it changes
reactiveUtils.watch(
  () => layer.visible,
  (visible) => {
    if (visible) {
      anotherLayer.visible = true;
    } else {
      anotherLayer.visible = false;
    }
  }
);

volumeStyles Property volumeStyles Collection<VoxelVolumeStyle>autocast Since: ArcGIS Maps SDK for JavaScript 4.24 VoxelLayer since 4.22, volumeStyles added at 4.24.

The collection of volume styles. There is currently only one volume and thus also only one VoxelVolumeStyle.

volumes Property volumes Collection<VoxelVolume>readonly Since: ArcGIS Maps SDK for JavaScript 4.25 VoxelLayer since 4.22, volumes added at 4.25.

The collection of volumes that the VoxelLayer has variables for. Currently only a single volume is supported.

Method Overview

Show inherited methods

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Return Type	Summary	Class
	Adds one or more handles which are to be tied to the lifecycle of the object.	Accessor
	Cancels a load() operation if it is already in progress.	Layer
PopupTemplate\|null\|undefined	Creates a default popup template for the layer, populated with the default voxel fields and a field for each variable in the layer.	VoxelLayer
	Destroys the layer and any associated resources (including its portalItem, if it is a property on the layer).	Layer
Boolean	Emits an event on the instance.	Layer
Promise<Object>	Fetches custom attribution data for the layer when it becomes available.	Layer
Color\|null\|undefined	Returns a Color for a given value for the continuous VoxelVariable identified by variableId using the variable's VoxelTransferFunctionStyle.	VoxelLayer
Field\|null\|undefined	Returns the Field instance for a field name (case-insensitive).	VoxelLayer
VoxelVariable\|null\|undefined	Returns a VoxelVariable based on an id.	VoxelLayer
VoxelVariableStyle\|null\|undefined	Returns a VoxelVariableStyle based on an id.	VoxelLayer
VoxelVolume\|null\|undefined	Returns a VoxelVolume based on the id of a VoxelVariable.	VoxelLayer
VoxelVolumeStyle\|null\|undefined	Returns a VoxelVolumeStyle based on the id of a VoxelVariable.	VoxelLayer
Boolean	Indicates whether there is an event listener on the instance that matches the provided event name.	Layer
Boolean	Returns true if a named group of handles exist.	Accessor
Boolean	`isFulfilled()` may be used to verify if creating an instance of the class is fulfilled (either resolved or rejected).	Layer
Boolean	`isRejected()` may be used to verify if creating an instance of the class is rejected.	Layer
Boolean	`isResolved()` may be used to verify if creating an instance of the class is resolved.	Layer
Promise	Loads the resources referenced by this class.	Layer
Object	Registers an event handler on the instance.	Layer
	Removes a group of handles owned by the object.	Accessor
Promise	`when()` may be leveraged once an instance of the class is created.	Layer

Method Details

addHandles Inherited Method addHandles(handleOrHandles, groupKey) Inherited from Accessor Since: ArcGIS Maps SDK for JavaScript 4.25 Accessor since 4.0, addHandles added at 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 }
);

this.addHandles(handle);

// Destroy the object
this.destroy();

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 Method cancelLoad() Inherited from Layer

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

createPopupTemplate Method createPopupTemplate(options){PopupTemplate |null |undefined} Since: ArcGIS Maps SDK for JavaScript 4.31 VoxelLayer since 4.22, createPopupTemplate added at 4.31.

Creates a default popup template for the layer, populated with the default voxel fields and a field for each variable in the layer.

Starting with version 4.28, date fields are formatted using the short-date-short-time preset dateFormat rather than long-month-day-year in popup templates created with the createPopupTemplate() method. For example, previously a date that may have appeared as "December 30, 1997" will now appear as "12/30/1997 6:00 PM".

Parameter

options CreatePopupTemplateOptions

optional

Options for creating the popup template.

Returns

Type	Description
PopupTemplate \| null \| undefined	The popup template, or `null` if the layer does not have any fields.

destroy Inherited Method destroy() Inherited from Layer

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 Inherited Method emit(type, event){Boolean} Inherited from Layer

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 Inherited Method fetchAttributionData(){Promise<Object>} Inherited from Layer

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.

getColorForContinuousDataValue Method getColorForContinuousDataValue(variableId, dataValue, applyOpacityStops){Color |null |undefined} Since: ArcGIS Maps SDK for JavaScript 4.25 VoxelLayer since 4.22, getColorForContinuousDataValue added at 4.25.

Returns a Color for a given value for the continuous VoxelVariable identified by variableId using the variable's VoxelTransferFunctionStyle. The applyOpacityStops parameter determines whether the transfer function's opacity stops are applied or not. Returns null if the variable is not a continuous variable or if the transfer function is not configured correctly.

Parameters

variableId Number

Voxel variable id for a continuous variable.

dataValue Number

The continuous data value to get a color for.

applyOpacityStops Boolean

Whether or not to apply the opacity stops to the returned color.

Returns

Type	Description
Color \| null \| undefined	The color or null if an invalid variableId was passed in.

getField Method getField(fieldName){Field |null |undefined} Since: ArcGIS Maps SDK for JavaScript 4.31 VoxelLayer since 4.22, getField added at 4.31.

Returns the Field instance for a field name (case-insensitive).

Parameter

fieldName String

Name of the field.

Returns

Type	Description
Field \| null \| undefined	the matching field or `undefined`

See also

fields

getVariable Method getVariable(variableId){VoxelVariable |null |undefined} Since: ArcGIS Maps SDK for JavaScript 4.24 VoxelLayer since 4.22, getVariable added at 4.24.

Returns a VoxelVariable based on an id. If you call getVariable(null) the current VoxelVariable is returned.

Parameter

variableId Number|null|undefined

Voxel variable id.

Returns

Type	Description
VoxelVariable \| null \| undefined	The variable or null if an invalid variableId was passed in.

getVariableStyle Method getVariableStyle(variableId){VoxelVariableStyle |null |undefined} Since: ArcGIS Maps SDK for JavaScript 4.25 VoxelLayer since 4.22, getVariableStyle added at 4.25.

Returns a VoxelVariableStyle based on an id. If you call getVariableStyle(null) the current VoxelVariableStyle is returned.

Parameter

variableId Number|null|undefined

Voxel variable id.

Returns

Type	Description
VoxelVariableStyle \| null \| undefined	The variable style or null if an invalid variableId was passed in.

getVolume Method getVolume(variableId){VoxelVolume |null |undefined} Since: ArcGIS Maps SDK for JavaScript 4.25 VoxelLayer since 4.22, getVolume added at 4.25.

Returns a VoxelVolume based on the id of a VoxelVariable. If you call getVolume(null) the current variable's VoxelVolume is returned.

Parameter

variableId Number|null|undefined

Voxel variable id.

Returns

Type	Description
VoxelVolume \| null \| undefined	The volume or null if an invalid variableId was passed in.

getVolumeStyle Method getVolumeStyle(variableId){VoxelVolumeStyle |null |undefined} Since: ArcGIS Maps SDK for JavaScript 4.25 VoxelLayer since 4.22, getVolumeStyle added at 4.25.

Returns a VoxelVolumeStyle based on the id of a VoxelVariable. If you call getVolumeStyle(null) the current variable's VoxelVolumeStyle is returned.

Parameter

variableId Number|null|undefined

Voxel variable id.

Returns

Type	Description
VoxelVolumeStyle \| null \| undefined	The volume style or null if an invalid variableId was passed in.

hasEventListener Inherited Method hasEventListener(type){Boolean} Inherited from Layer

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 Inherited Method hasHandles(groupKey){Boolean} Inherited from Accessor Since: ArcGIS Maps SDK for JavaScript 4.25 Accessor since 4.0, hasHandles added at 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");
}

isFulfilled Inherited Method isFulfilled(){Boolean} Inherited from Layer

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 Inherited Method isRejected(){Boolean} Inherited from Layer

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 Inherited Method isResolved(){Boolean} Inherited from Layer

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 Inherited Method load(options){Promise} Inherited from Layer

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.

Parameters

options Object|null|undefined

optional

Additional options.

Specification

signal AbortSignal|null|undefined

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 Inherited Method on(type, listener){Object} Inherited from Layer

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

Parameters

type String|String []

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);
});

removeHandles Inherited Method removeHandles(groupKey) Inherited from Accessor Since: ArcGIS Maps SDK for JavaScript 4.25 Accessor since 4.0, removeHandles added at 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 Inherited Method when(callback, errback){Promise} Inherited from Layer

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

Type	Summary	Class
{view: View,layerView: LayerView}	Fires after the layer's LayerView is created and rendered in a view.	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.	Layer
{view: View,layerView: LayerView}	Fires after the layer's LayerView is destroyed and no longer renders in a view.	Layer

Event Details

layerview-create Inherited Event layerview-create Inherited from Layer

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

View.whenLayerView()

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-error Inherited Event layerview-create-error Inherited from Layer

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

View.whenLayerView()

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-destroy Inherited Event layerview-destroy Inherited from Layer

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.