map.ground.load()
  .then(function() {
    // create an elevation sampler from a given extent
    return view.map.ground.createElevationSampler(extent);
  })
  .then(function(elevationSampler) {
    // use the elevation sampler to get z-values for a point, multipoint or polyline geometry
    var zEnrichedGeometry = elevationSampler.queryElevation(geometry);
  });
});

var elevationSampler = view.groundView.elevationSampler;
// listen for elevation changes in the view
elevationSampler.on('changed', function() {
  // enrich geometry with z-values from the elevation displayed in the view
  var zEnrichedGeometry = elevationSampler.queryElevation(point);
});

Property Overview

Property Details

demResolutionObjectreadonly

The minimum and maximum resolution of the data in the sampler.

Properties:

min Number The minimum resolution.

max Number The maximum resolution.

extentExtentreadonly

Since: ArcGIS API for JavaScript 4.9

The extent within which the sampler can be queried.

noDataValueNumberreadonly

Since: ArcGIS API for JavaScript 4.9

The value that is used to represent areas where there is no data available.

Method Overview

Method Details

on(type, handler?){Object}

Registers an event handler on the instance. Call this method to hook an event with a listener. See the Events summary table for a list of listened events.

Parameters:

type String|String[] The name of the event or the events to listen for.

handler? Function The function to call when the event is fired, if modifiers were specified.

Returns:

Type	Description
Object	Returns an event handler with a remove() method that can be called to stop listening for the event. Property Type Description remove Function When called, removes the listener from the event.

See also:

• dojo/on

Example:

view.groundView.elevationSampler.on("changed", function(evt) {
 console.log("elevation has changed");
});

queryElevation(geometry){Point|Multipoint|Polyline}

Query elevation for a Point, Polyline or Multipoint geometry. A query will return a new geometry for which the z-values for each coordinate in the geometry are obtained from the elevation sampler. If the geometry used for the query is outside of the elevation sampler extent, then the returned geometry has 0 as z-values.

Parameter:

geometry Point|Multipoint|Polyline The geometry to use for sampling elevation data.

Returns:

Type	Description
Point | Multipoint | Polyline	The sampled geometry.

Event Overview

Event Details

changed

Fires when the data in the sampler has changed. This event is only relevant for dynamic elevation samplers such as the elevation sampler on the GroundView.

Example:

view.groundView.elevationSampler.on("changed", function(evt) {
 console.log("elevation has changed");
});