imageService

Method Overview

Method Details

computeAngles(url, parameters, requestOptions){Promise<ImageAngleResult>}

Since: ArcGIS API for JavaScript 4.22

beta

Computes the rotation angle of a ImageryLayer at a given location. This operation is supported at 10.9.1 and later.

Parameters:

url String URL to the ArcGIS Server REST resource that represents an image service.

parameters ImageAngleParameters autocast Autocasts from Object Specifies parameters for computing angles.

requestOptions Object optional Additional options to be used for the data request (will override requestOptions defined during construction).

Returns:

Type	Description
Promise<ImageAngleResult>	When resolved, returns an instance of ImageAngleResult containing computed north and up angles.

See also:

• ArcGIS REST API - Compute Angles

computeHistograms(url, parameters, requestOptions){Promise<Object>}

Computes histograms based on the provided ImageHistogramParameters. If a rendering rule and a mosaic rule are not specified, the current settings on the layer will be used. This operation is supported by an image service published with a mosaic dataset or a raster dataset at ArcGIS Server 10.4 and later. The result of this operation contains histograms computed for the given extent.

Parameters:

url String URL to the ArcGIS Server REST resource that represents an image service.

parameters ImageHistogramParameters autocast Autocasts from Object Specifies parameters for computing histograms.

requestOptions Object optional Additional options to be used for the data request (will override requestOptions defined during construction).

Returns:

Type	Description
Promise<Object>	Resolves to an object containing histogram results. See the object specification table below for details. Property Type Description histograms[] RasterHistogram Result containing raster histograms.

computePixelSpaceLocations(url, parameters, requestOptions){Promise<ImagePixelLocationResult>}

Since: ArcGIS API for JavaScript 4.22

Computes the corresponding pixel location in columns and rows for an ImageryLayer based on input geometry. Requires that the raster catalog item has a valid icsToPixel resource.

Parameters:

url String URL to the ArcGIS Server REST resource that represents an image service.

parameters ImagePixelLocationParameters Specifies parameters for computing image space pixel location.

requestOptions Object optional Additional options to be used for the data request (will override requestOptions defined during construction).

Returns:

Type	Description
Promise<ImagePixelLocationResult>	When resolved, returns an instance of ImagePixelLocationResult containing x and y values for the column and row of each input geometry.

See also:

• ArcGIS REST API - Compute Pixel Location

computeStatisticsHistograms(url, parameters, requestOptions){Promise<Object>}

Computes statistics and histograms for the provided ImageHistogramParameters. If a rendering rule and a mosaic rule are not specified, the current settings on the layer will be used. This operation is supported by an image service published with a mosaic dataset or a raster dataset at ArcGIS Server 10.4 and later. The result of this operation contains both statistics and histograms computed for the given extent.

Parameters:

url String URL to the ArcGIS Server REST resource that represents an image service.

parameters ImageHistogramParameters autocast Autocasts from Object Specifies parameters for computing statistics and histograms.

requestOptions Object optional Additional options to be used for the data request (will override requestOptions defined during construction).

Returns:

Type	Description
Promise<Object>	Resolves to an object containing histogram and statistics results. See the object specification table below for details. Property Type Description histograms[] RasterHistogram Result containing raster histograms. bandStatistics[] RasterBandStatistics Raster band statistics.

getSamples(url, parameters, requestOptions){Promise<ImageSampleResult>}

Since: ArcGIS API for JavaScript 4.23

Returns sample point locations, pixel values and corresponding resolutions of the source data for a given geometry. When the input geometry is a polyline, extent, or polygon, the sampling is based on sampleCount or sampleDistance parameters. When the geometry is a point or multipoint, the point or points are used directly.

The number of sample locations in the response is based on the sampleDistance or sampleCount parameter and cannot exceed the limit imposed by the image service. The sample points are located at the intersection of the provided geometry and the raster item's footprints. They are also filtered by the mosaicRule and pixelSize parameters.

Parameters:

url String URL to the ArcGIS Server REST resource that represents an image service.

parameters ImageSampleParameters autocast Autocasts from Object The parameters used in the getSamples operation.

requestOptions Object optional Additional options to be used for the data request (will override requestOptions defined during construction).

Returns:

Type	Description
Promise<ImageSampleResult>	When resolved, ImageSampleResult is returned containing an array of ImageSamples.

Example:

// get all sample points along a polyline
// at the specified sample distance and pixel size
const param = {
  geometry: polyline
  returnFirstValueOnly: false,
  // resolution - unit of the view's spatial reference
  pixelSize: {
    x:12,
    y:12,
    spatialReference: view.spatialReference
  },
  interpolation: "nearest",
  // unit of the geometry's spatial reference is used
  sampleDistance: 30,
  outFields: ["*"]
};
imageService.getSamples(url, param).then((results) => {
  // use the getSamples results as needed.
  console.log(results);
})
.catch(function(error){
  console.log(error)
})

identify(url, params, requestOptions){Promise<ImageIdentifyResult>}

Sends a request to the ArcGIS REST image service resource to identify content based on the ImageIdentifyParameters specified in the params argument.

Parameters:

url String URL to the ArcGIS Server REST resource that represents an image service.

params ImageIdentifyParameters Specifies the criteria used to identify the features.

requestOptions Object optional Additional options to be used for the data request (will override requestOptions defined during construction).

Returns:

Type	Description
Promise<ImageIdentifyResult>	When resolved, returns an instance of ImageIdentifyResult.