LineOfSightAnalysis

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

LineOfSightAnalysis computes the line of sight from a single observer position towards a set of targets. The results are visualized in a 3D SceneView.

To display the line of sight between two points, create a new instance of LineOfSightAnalysis, add it to SceneView.analyses and set the observer and targets property.

Use the LineOfSightAnalysisView3D to retrieve analysis results.

// create lineofsight analysis
const lineOfSightAnalysis = new LineOfSightAnalysis({
  observer: new LineOfSightAnalysisObserver({ position: somePoint),
  targets:[
    new LineOfSightAnalysisTarget({position: someOtherPoint})
  ]
});

// add to scene view
view.analyses.add(lineOfSightAnalysis);

// wait for the view to load before checking the result
await reactiveUtils.whenOnce(() => !view.updating);

// retrieve measured results from analysis view
const analysisView = await view.whenAnalysisView(lineOfSightAnalysis);
const results = analysisView.results;

Use the LineOfSight widget in order to add interactivity and allow users to change the geometry of the analysis.

If the observer position or target position have z-values then these will be treated as absolute values, otherwise the points will be aligned to the ground.

Known Limitation

This analysis is only supported in a 3D SceneView.

See also

Constructors

new LineOfSightAnalysis(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 name of the class.

more details
Accessor
LineOfSightAnalysisObserver

Observer location.

more details
LineOfSightAnalysis
Collection<LineOfSightAnalysisTarget>

Target locations.

more details
LineOfSightAnalysis

Property Details

declaredClass Stringreadonly inherited

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

Observer location. This is the point from which line of sight analysis is performed.

Target locations. A list of points to look at from the observer.

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
this

Creates a deep clone of this object.

more details
LineOfSightAnalysis
Boolean

Returns true if a named group of handles exist.

more details
Accessor

Removes a group of handles owned by the object.

more details
Accessor

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.

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 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");
}
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");

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