LineOfSightAnalysisObserver

Property Overview

Property Details

declaredClass Stringreadonly inherited

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

elevationInfo Object

Specifies how the observer is placed on the vertical axis (z). See the ElevationInfo sample for an example of how this property may be used.

Properties

mode String Defines how the observer is placed with respect to the terrain surface or 3D objects in the scene. See the table below for a list of possible values. Mode Description on-the-ground Observer is aligned to the Ground. If the scene contains an IntegratedMeshLayer, then the observer is aligned to the IntegratedMeshLayer. If that observer has a z-value, then the z-value is ignored in this mode. This is the default value when hasZ on position is false. absolute-height Observer is placed at an absolute elevation (z-value) above sea level. This z-value is determined by the observer's z-value (if present). This mode doesn't take the elevation of the Ground or any other layers into account. This is the default value when hasZ on position is true. relative-to-ground Observer is placed at an elevation relative to the Ground or IntegratedMeshLayer. The elevation is determined by summing up the elevation of the Ground or IntegratedMeshLayer and the geometry's z-value (if present). relative-to-scene Observer is aligned to extruded polygons, 3D Object SceneLayers or BuildingSceneLayers, depending on which one has higher elevation. If the observer is not directly above a building or any other feature, it is aligned to the elevation of the Ground or the IntegratedMeshLayer. If present, the observer's z-value is added to the elevation. Possible Values:"on-the-ground"|"relative-to-ground"|"absolute-height"|"relative-to-scene"

offset Number optional An elevation offset, which is added to the vertical position of the observer. If unit is not defined, the offset is in meters. When mode = "on-the-ground", this property has no effect.

feature Graphic

Specifies a feature which shall be excluded from intersection testing. This is used when placing line of sight positions on scene geometry. Due to level of detail, the scene geometry may be subject to changes which would cause unstable analysis results. By specifying a feature which is to be excluded from intersection testing, this problem can be circumvented.

Note that you can assign client side graphics which will be taken into account acccordingly. However, information about client side graphic will not be persisted and results in an empty reference after de-serialization.

position Pointautocast

A Point representing the position of the observer. Once the position is set, a new line of sight analysis will synchronously calculate the intersection and the visibility to each target of the associated LineOfSightAnalysis.

If the observer is assigned to a LineOfSightLayer then this property must be defined before the layer can be saved to a WebScene.

Method Overview

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.

clone(){this}

Creates a deep clone of this object. Any properties that store values by reference will be assigned copies of the referenced values on the cloned instance.

Returns

Type	Description
this	A deep clone of the class instance that invoked this method.

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");
}

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");