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),
    new LineOfSightAnalysisTarget({position: someOtherPoint})

// add to scene view

// 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:


new LineOfSightAnalysis(properties)
properties Object

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
LineOfSightAnalysisObservermore details

Observer location.

more detailsLineOfSightAnalysis
Collection<LineOfSightAnalysisTarget>more details

Target locations.

more detailsLineOfSightAnalysis

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
thismore details

Creates a deep clone of this object.

more detailsLineOfSightAnalysis
more details

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

more detailsAccessor

Method Details


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.

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


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

Handles marked for removal once the object is destroyed.

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