VoxelLayer

AMD: require(["esri/layers/VoxelLayer"], (VoxelLayer) => { /* code goes here */ });
ESM: import VoxelLayer from "@arcgis/core/layers/VoxelLayer";
Class: esri/layers/VoxelLayer
Inheritance: VoxelLayer Layer Accessor
Since: ArcGIS API for JavaScript 4.22

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 WebGL2 and 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.

The Scene Service is identified by the URL of the ArcGIS Server REST resource:

let voxelLayer = new VoxelLayer({
   url: "https://tiles.arcgis.com/tiles/z2tnIkrLQ2BRzr6P/arcgis/rest/services/EMU_Caribbean_Voxel/SceneServer"
});

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

See also

Constructors

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 Working with Properties topic.
Show inherited properties Hide inherited properties
Name Type Summary Class
String

An authorization string used to access a resource or service.

more details
VoxelLayer
String

The copyright text as defined by the scene service.

more details
VoxelLayer
Number

The variable that is being displayed.

more details
VoxelLayer
String

The name of the class.

more details
Accessor
Boolean

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

more details
VoxelLayer
Boolean

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

more details
VoxelLayer
Boolean

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

more details
VoxelLayer
Extent

The full extent of the layer.

more details
Layer
String

The unique ID assigned to the layer.

more details
Layer
Number

The layer ID, or layer index, of a Scene Service layer.

more details
VoxelLayer
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
VoxelLayer
Number

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

more details
VoxelLayer
PortalItem

The portal item from which the layer is loaded.

more details
VoxelLayer
String

Current rendering mode for the VoxelLayer.

more details
VoxelLayer
SpatialReference

The spatial reference of the layer.

more details
VoxelLayer
String

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

more details
Layer
String For VoxelLayer the type is always "voxel". more detailsVoxelLayer
String

The URL of the REST endpoint of the layer or scene service.

more details
VoxelLayer
Collection<VoxelVariable>

The collection of variables that the VoxelLayer has data for.

more details
VoxelLayer
Collection<VoxelVariableStyle>

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

more details
VoxelLayer
Object

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

more details
VoxelLayer
Boolean

Indicates if the layer is visible in the View.

more details
Layer
Collection<VoxelVolume>

The collection of volumes that the VoxelLayer has variables for.

more details
VoxelLayer
Collection<VoxelVolumeStyle>

The collection of volume styles.

more details
VoxelLayer

Property Details

apiKey String

An authorization string used to access a resource or service. API keys are generated and managed in the ArcGIS Developer dashboard. 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.

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

The copyright text as defined by the scene service.

currentVariableId Number
Since: ArcGIS API for JavaScript 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
declaredClass Stringreadonly inherited

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

enableDynamicSections Boolean
Since: ArcGIS API for JavaScript 4.25

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

enableIsosurfaces Boolean
Since: ArcGIS API for JavaScript 4.25

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

enableSlices Boolean
Since: ArcGIS API for JavaScript 4.25

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

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.

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
});
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;
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);
  }
});
renderMode String
Since: ArcGIS API for JavaScript 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 SpatialReferenceautocast

The spatial reference of the 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 Stringreadonly

For VoxelLayer the type is always "voxel".

url String

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
});
variables Collection<VoxelVariable>readonly
Since: ArcGIS API for JavaScript 4.24

The collection of variables that the VoxelLayer has data for.

variableStyles Collection<VoxelVariableStyle>
Since: ArcGIS API for JavaScript 4.25

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

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
Example
// Prints the version to the console - e.g. 1.4, 1.5, etc.
console.log(layer.version.versionString);
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;
volumes Collection<VoxelVolume>readonly
Since: ArcGIS API for JavaScript 4.25

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

Since: ArcGIS API for JavaScript 4.24

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

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

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
Color|null

Returns a Color for a given value for the continuous VoxelVariable identified by variableId using the variable's VoxelTransferFunctionStyle.

more details
VoxelLayer
VoxelVariable|null

Returns a VoxelVariable based on an id.

more details
VoxelLayer
VoxelVariableStyle|null

Returns a VoxelVariableStyle based on an id.

more details
VoxelLayer
VoxelVolume|null

Returns a VoxelVolume based on the id of a VoxelVariable.

more details
VoxelLayer
VoxelVolumeStyle|null

Returns a VoxelVolumeStyle based on the id of a VoxelVariable.

more details
VoxelLayer
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
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

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 API 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.

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.
getColorForContinuousDataValue(variableId, dataValue, applyOpacityStops){Color|null}
Since: ArcGIS API for JavaScript 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 continous 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 The color or null if an invalid variableId was passed in.
getVariable(variableId){VoxelVariable|null}
Since: ArcGIS API for JavaScript 4.24

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

Parameter
variableId Number|null

Voxel variable id.

Returns
Type Description
VoxelVariable | null The variable or null if an invalid variableId was passed in.
getVariableStyle(variableId){VoxelVariableStyle|null}
Since: ArcGIS API for JavaScript 4.25

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

Parameter
variableId Number|null

Voxel variable id.

Returns
Type Description
VoxelVariableStyle | null The variable style or null if an invalid variableId was passed in.
getVolume(variableId){VoxelVolume|null}
Since: ArcGIS API for JavaScript 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

Voxel variable id.

Returns
Type Description
VoxelVolume | null The volume or null if an invalid variableId was passed in.
getVolumeStyle(variableId){VoxelVolumeStyle|null}
Since: ArcGIS API for JavaScript 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

Voxel variable id.

Returns
Type Description
VoxelVolumeStyle | null The volume style or null if an invalid variableId was passed in.
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 API 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");
}
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);
});
removeHandles(groupKey)inherited
Since: ArcGIS API 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

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}

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

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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