LineOfSightAnalysisObserver

AMD: require(["esri/analysis/LineOfSightAnalysisObserver"], (LineOfSightAnalysisObserver) => { /* code goes here */ });
ESM: import LineOfSightAnalysisObserver from "@arcgis/core/analysis/LineOfSightAnalysisObserver";
Class: esri/analysis/LineOfSightAnalysisObserver
Inheritance: LineOfSightAnalysisObserver Accessor
Since: ArcGIS API for JavaScript 4.23

The LineOfSightAnalysisObserver represents an observer of a LineOfSightAnalysis.

Use the position property to specify the position of the observer.

See also:

Constructors

new LineOfSightAnalysisObserver(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
Stringmore details

The name of the class.

more detailsAccessor
Objectmore details

Specifies how the observer is placed on the vertical axis (z).

more detailsLineOfSightAnalysisObserver
Graphicmore details

Specifies a feature which shall be excluded from intersection testing.

more detailsLineOfSightAnalysisObserver
Pointmore details

A Point representing the position of the observer.

more detailsLineOfSightAnalysisObserver

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.

elevation-info

Mode Description
on-the-ground Observer is aligned to the Ground. If the scene contains an IntegratedMeshLayer, then features are aligned to the IntegratedMeshLayer. If features have z-values, then the z-values are ignored in this mode. Features with 2D symbols are draped on the Ground or IntegratedMeshLayer. This is the default mode for layers without z-values containing Polyline, Polygon features or Point features rendered with ObjectSymbol3DLayer.
absolute-height Observer is placed at an absolute elevation (z-value) above sea level. This z-value is determined by the geometry's z-value (if present). If featureExpressionInfo is defined, the result of the expression is used instead of the geometry’s z-value. This mode doesn't take the elevation of the Ground or any other layers into account. This is the default value when observer position hasZ 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). If featureExpressionInfo is defined, the result of the expression is used instead of the observers z-value. If the observer doesn't have a z-value, relative-to-ground is the default value for Point geometries rendered with IconSymbol3DLayers.
relative-to-scene Observer is aligned to extruded polygons, 3D Object SceneLayers or BuildingSceneLayers, depending on which one has higher elevation. If the feature 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 observers z-value is added to the elevation. If featureExpressionInfo is defined, the result of the expression is used instead of the geometry’s z-value.

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.

Method Overview

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Name Return Type Summary Class
thismore details

Creates a deep clone of this object.

more detailsLineOfSightAnalysisObserver
more details

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

more detailsAccessor

Method Details

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.
own(handleOrHandles)inherited
Since: ArcGIS API for JavaScript 4.24

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.whenOnce(() => !view.updating)
  .then(() => {
    wkidSelect.disabled = false;
});

handle.remove();

// Assign a handle using own()
this.own(reactiveUtils.whenOnce(() => !view.updating)
  .then(() => {
    wkidSelect.disabled = false;
  }));
Parameter:
handleOrHandles WatchHandle|WatchHandle[]

Handles marked for removal once the object is destroyed.

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