ElevationLayer

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

ElevationLayer is a tile layer used for rendering elevations in SceneViews. A default world elevation layer can be added to the map by setting the map's ground property to world-elevation.

elev-default

Elevation layers are set in the layers property of a map's ground. They should not be added to the map's operational layers.

let elevLyr = new ElevationLayer({
  // Custom elevation service
  url: "https://sampleserver6.arcgisonline.com/arcgis/rest/services/Elevation/MtBaldy_Elevation/ImageServer"
});
// Add elevation layer to the map's ground.
map.ground.layers.add(elevLyr);

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

See also

Constructors

new ElevationLayer(properties)
Parameter
properties Object
optional

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

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

The copyright text as defined by the service.

more details
ElevationLayer
String

The name of the class.

more details
Accessor
Extent

The full extent of the layer.

more details
Layer
String

The unique ID assigned to the layer.

more details
Layer
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 opacity of the layer.

more details
Layer
PortalItem

The portal item from which the layer is loaded.

more details
ElevationLayer
Object

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

more details
ElevationLayer
SpatialReference

The spatial reference of the layer as defined by the service.

more details
ElevationLayer
TileInfo

Contains information about the tiling scheme for the layer.

more details
ElevationLayer
String

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

more details
ElevationLayer
String For ElevationLayer the type is always "elevation". more detailsElevationLayer
String

URL pointing to the Elevation layer resource on an ArcGIS Image Server.

more details
ElevationLayer
Boolean

Indicates if the layer is visible in the View.

more details
Layer

Property Details

The copyright text as defined by the service.

declaredClass Stringreadonly inherited
Since: ArcGIS Maps SDK for JavaScript 4.7

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

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.

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.

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 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);
  }
});
sourceJSON Object
Since: ArcGIS Maps SDK for JavaScript 4.13

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

spatialReference SpatialReferencereadonly

The spatial reference of the layer as defined by the service.

tileInfo TileInfo

Contains information about the tiling scheme for the layer.

title String

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

When loading a layer by service url, the title is derived from the service name. When the layer is loaded from a portal item, the title of the portal item will be used instead. Finally, 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 ElevationLayer the type is always "elevation".

url String

URL pointing to the Elevation layer resource on an ArcGIS Image Server.

Example
url: "http://elevation3d.arcgis.com/arcgis/rest/services/WorldElevation3D/Terrain3D/ImageServer"
visible Boolean inherited

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

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

Method Overview

Show inherited methods Hide inherited methods
Name Return Type Summary Class

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

more details
Accessor

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

more details
Layer
Promise<ElevationSampler>

Creates an elevation sampler for the given Extent by querying the service layer for elevation data and caching it so values may be sampled quickly afterwards.

more details
ElevationLayer
Promise<LayerView>

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

more details
Layer

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

more details
Layer
Boolean

Emits an event on the instance.

more details
Layer
Promise<object>

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

more details
Layer
Promise<ElevationTileData>

Requests a tile from the service and decodes the data into a linear array of elevation values.

more details
ElevationLayer
String

This method returns a URL to a tile for a given level, row and column.

more details
ElevationLayer
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
Promise<ElevationQueryResult>

Queries the service layer for elevation values for the given geometry.

more details
ElevationLayer

Removes a group of handles owned by the object.

more details
Accessor
Promise

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

more details
Layer

Method Details

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

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

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

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

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

createElevationSampler(extent, options){Promise<ElevationSampler>}
Since: ArcGIS Maps SDK for JavaScript 4.7

Creates an elevation sampler for the given Extent by querying the service layer for elevation data and caching it so values may be sampled quickly afterwards. The resolution of the cached data can be set using the demResolution option. In many cases, auto demResolution can be used to get high quality elevation samples without the need to know exactly where the data in the service is located. This is particularly useful for services which combine elevation data from many sources (such as the world elevation service). If more control, or higher quality samples are required, use either finest-contiguous or a fixed {number} resolution.

Parameters
Specification
extent Extent

The extent for which to create the sampler.

options Object
optional

Additional query options. See the table below.

Specification
demResolution Number|String
optional
Default Value: auto

Controls the horizontal resolution (cell size) in meters from which elevation data is sampled (defaults to auto). See ElevationLayer for more details.

noDataValue Number
optional
Default Value: 0

The value to use when there is no data available.

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<ElevationSampler> An elevation sampler.
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
destroy()inherited
Since: ArcGIS Maps SDK for JavaScript 4.17

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

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

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

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

Parameters
type String

The name of the event.

event Object
optional

The event payload.

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

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

Returns
Type Description
Promise<object> Resolves to an object containing custom attribution data for the layer.
fetchTile(level, row, column, options){Promise<ElevationTileData>}

Requests a tile from the service and decodes the data into a linear array of elevation values.

The returned promise resolves with a plain object describing the obtained elevation data for the tile. The object has the following properties:

Property Type Description
values Float32Array The elevation values contained in the tile.
width number The number of elevation values in one row of the tile.
height number The number of elevation values in one column of the tile.
maxZError number The upper bound for the compression error on the elevation values.
Parameters
Specification
level Number

the tile level.

row Number

the tile row.

column Number

the tile column.

options Object
optional

Optional settings for the tile request.

Specification
noDataValue Number
optional

The value representing pixels in the tile that don't contain an elevation value.

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<ElevationTileData> a Promise which resolves with elevation tile data.
getTileUrl(level, row, col){String}

This method returns a URL to a tile for a given level, row and column.

Parameters
level Number

The requested tile's level.

row Number

The requested tile's row.

col Number

The requested tile's column.

Returns
Type Description
String Returns the tile URL.
hasEventListener(type){Boolean}inherited

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

Parameter
type String

The name of the event.

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

Returns true if a named group of handles exist.

Parameter
groupKey *
optional

A group key.

Returns
Type Description
Boolean Returns true if a named group of handles exist.
Example
// Remove a named group of handles if they exist.
if (obj.hasHandles("watch-view-updates")) {
  obj.removeHandles("watch-view-updates");
}
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);
});
queryElevation(geometry, options){Promise<ElevationQueryResult>}

Queries the service layer for elevation values for the given geometry. The returned result contains a copy of the geometry with z-values sampled from elevation data from the service. The resolution from which the elevation is queried can be set using the demResolution option. In many cases, auto demResolution can be used to get high quality elevation samples without the need to know exactly where the data in the service is located. This is particularly useful for services which combine elevation data from many sources (such as the world elevation service). If more control, or higher quality samples are required, use either finest-contiguous or a fixed {number} resolution.

Parameters
Specification

The geometry to use for sampling elevation data.

options Object
optional

Additional query options. See the table below.

Specification
demResolution Number|String
optional
Default Value: auto

Controls the horizontal resolution (cell size) in meters from which elevation data is sampled (defaults to auto). See the table below for more details on the different settings.

demResolution Description
auto Automatically chooses an appropriate resolution for each coordinate of the input geometry. The current implementation will try to use the finest available resolution given that the total required number of tile requests does not exceed a certain maximum amount (currently 20). Note that this may result in values being sampled from different resolutions.
finest-contiguous Sample elevation from the finest available resolution (cell size) across the entire geometry.
{number} Sample elevation from the resolution closest to the specified resolution (in meters).
returnSampleInfo Boolean
optional
Default Value: false

Indicates whether to return additional sample information for each coordinate.

noDataValue Number
optional
Default Value: 0

The value to use when there is no data available.

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<ElevationQueryResult> Resolves to an object with the sampled geometry, resolution information, and no data value.
Example
require(["esri/layers/ElevationLayer", "esri/geometry/Multipoint"], function (
 ElevationLayer,
 Multipoint
) {
 const url =
   "//elevation3d.arcgis.com/arcgis/rest/services/WorldElevation3D/Terrain3D/ImageServer/";
 const layer = new ElevationLayer(url);

 // Various points across a ridge of the mount everest
 const points = [
   [86.9252, 27.9883],
   [86.9265, 27.9894],
   [86.9292, 27.9923],
   [86.9324, 27.996],
   [86.9359, 27.9992]
 ];

 // Uses "auto" resolution by default
 layer
   .queryElevation(new Multipoint({ points }), {
     returnSampleInfo: true
   })

   // Successfully sampled all points
   .then(function (result) {
     // Print result of each sampled point to the console
     result.geometry.points.forEach(function (point, index) {
       const elevation = Math.round(point[2]);
       const resolution = result.sampleInfo[index].demResolution;

       const coordinateText = "(" + point[0] + ", " + point[1] + ")";
       const resolutionText = Math.round(resolution) + " meter resolution";

       console.log("Sampled " + coordinateText + ": " + elevation + " at " + resolutionText);
     });
   })

   // Failed to sample (e.g. service unavailable)
   .catch(function (error) {
     console.error("Failed to query elevation:", error);
   });
});
removeHandles(groupKey)inherited
Since: ArcGIS Maps SDK for JavaScript 4.25

Removes a group of handles owned by the object.

Parameter
groupKey *
optional

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

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

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

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

Parameters
callback Function
optional

The function to call when the promise resolves.

errback Function
optional

The function to execute when the promise fails.

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

Type Definitions

ElevationQueryResult

Object returned when queryElevation() promise resolves:

Properties

The geometry with sampled z-values.

sampleInfo Object[]
optional

Contains additional information about how the geometry was sampled. This property is present depending on whether the user set options.returnSampleInfo = true, for each coordinate in the geometry.

Specification
demResolution Number

The resolution at which the z-value was sampled. If no data was available for sampling for a given coordinate, the dem resolution value will be -1 for that coordinate.

noDataValue Number

The value used when there is no data available.

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.

Your browser is no longer supported. Please upgrade your browser for the best experience. See our browser deprecation post for more details.