GroundView | API Reference | ArcGIS Maps SDK for JavaScript 4.31

This class represents the view for the Ground of a map. It can be used to sample elevation from the terrain surface that is currently visible in the view or to access the LayerViews of the layers in the ground. An instance of this class can be accessed through SceneView.groundView.

See also

Property Overview

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

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Type	Summary	Class
String	The name of the class.	Accessor
ElevationSampler	An elevation sampler that may be used to sample and query elevation values from the ground surface that is currently being displayed.	GroundView
Extent	The extent represents the visible portion of ground within the view as an instance of Extent.	GroundView
Collection<LayerView>	A collection containing a hierarchical list of all the created LayerViews of the layers in the ground.	GroundView
Boolean	Value is `true` when any of the ground layer views are updating.	GroundView

Property Details

declaredClass Inherited Property declaredClass Stringreadonly Inherited from Accessor

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

elevationSampler Property elevationSampler ElevationSamplerreadonly

An elevation sampler that may be used to sample and query elevation values from the ground surface that is currently being displayed.

The elevation sampler is not supported for MapView and may be null while the ground surface display is being initialized.

The resolution of the sampled values depends on the ground elevation display resolution (high resolution close to the camera, low resolution far away from the camera). Because of the dynamic nature of the display resolution, the demResolution property of the returned sampler will always return `{ min: -1, max: -1 }.

If higher or more consistent sample resolution is required, then consider creating a sampler at the desired resolution using ElevationLayer.createElevationSampler or Ground.createElevationSampler.

Example

let elevationSampler = view.groundView.elevationSampler;
// watch for changes in the elevationSampler
elevationSampler.on('changed', function() {
  // get z-values from the elevation displayed in the view
  let zEnrichedGeometry = elevationSampler.queryElevation(geometry);
});

extent Property extent Extentreadonly Since: ArcGIS Maps SDK for JavaScript 4.28 GroundView since 4.7, extent added at 4.28.

The extent represents the visible portion of ground within the view as an instance of Extent. The ground view extent is computed based on the ground surface elevation at the center of the view, while the SceneView extent is computed at the elevation of all of the scene content at the center of the view. The ground view extent may be more appropriate when synchronizing the viewpoint of a MapView and a SceneView.

Default Value:null

layerViews Property layerViews Collection<LayerView>readonly

A collection containing a hierarchical list of all the created LayerViews of the layers in the ground.

See also

LayerView

updating Property updating Booleanreadonly

Value is true when any of the ground layer views are updating.

Default Value:false

Method Overview

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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
Boolean	Returns true if a named group of handles exist.	Accessor
	Removes a group of handles owned by the object.	Accessor

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.

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");
}

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");