Create Interactive viewshed

mody_buchbinder

I would like to create with code something similar to this: https://pro.arcgis.com/en/pro-app/latest/help/mapping/exploratory-analysis/interactive-viewshed.htm

Using code I can read parameters from file and control the process beter.

I found the Viewshed class that looks like the class I need.

There are no examples I could  find.

I could set the Camera properties and the Viewshed properties, but I cannot connect it to any MapView.

The MapView property is read-only. It is null when I run my code and no viewshed is created on screen.

There should be a way to define it but I cannot find it.

I connect my camera into the map (Camera camera = MapView.Active.Camera) then I just updated the properties (x,y, etc) but it did not help.

Thanks

GKmieliauskas

Hi,

MapView has method AddExploratoryAnalysisAsync. Viewshed is derived from ExploratoryAnalysis. Code below:

        protected override async void OnClick()
        {
            var mapView = MapView.Active;
            if (mapView == null)
                return;
            var observerPointLayer = mapView.Map.GetLayersAsFlattenedList().OfType<FeatureLayer>().FirstOrDefault(layer => layer.Name.Equals("ObserverPoint"));
            if (observerPointLayer == null)
                return;

            ExploratoryAnalysis item0 = await QueuedTask.Run(() => {
                #region Get the observer point
                var observerPtCursor = observerPointLayer.Search();
                MapPoint observerPoint = null; MapPoint targetPoint = null;
                MapPoint observerPointProjected = null;
                while (observerPtCursor.MoveNext())
                {
                    var observerPtFeature = observerPtCursor.Current as Feature;
                    observerPoint = observerPtFeature.GetShape() as MapPoint;
                    observerPointProjected = GeometryEngine.Instance.
                                                  Project(observerPoint, mapView.Map.SpatialReference) as MapPoint;
                }
                #endregion

                Camera camera = new Camera(observerPointProjected.X, observerPointProjected.Y, 10.0, 0, 0);
                Viewshed viewshed = new Viewshed(camera, 0, 180, 100, 1000);
                return viewshed;
            });

            await mapView.AddExploratoryAnalysisAsync(item0);

        }