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Viewshed Geoprocessing

Calculate a viewshed against terrain using a geoprocessing service.

How to use the sample

After the geoprocessing task finishes loading (the spinner will stop), click anywhere on the map to generate a viewshed at that location. A viewshed will be calculated using the service's default distance of 15km.

How it works

To create a viewshed from a geoprocessing service:

  1. Create a GeoprocessingTask with the URL set to the viewshed endpoint of a geoprocessing service .
  2. Create a FeatureCollectionTable and add a new Feature whose geometry is the Point where you want to create the viewshed.
  3. Make GeoprocessingParameters with an input for the viewshed operation parameters.getInputs().put("Input_Observation_Point", new GeoprocessingFeatures(featureCollectionTable)).
  4. Use the GeoprocessingTask to create a GeoprocessingJob with the parameters.
  5. Start the job and wait for it to complete and return a GeoprocessingResult.
  6. Get the resulting GeoprocessingFeatures using geoprocessingResult.getOutputs().get("Viewshed_Result").
  7. Iterate through the viewshed features in geoprocessingFeatures.getFeatures() to use their geometry or display the geometry in a graphic.

Relevant API

  • FeatureCollectionTable
  • GeoprocessingFeatures
  • GeoprocessingJob
  • GeoprocessingParameters
  • GeoprocessingResult
  • GeoprocessingTask