private async Task <MapPoint> ShowViewshed(MapView mapView, int featureId) { MapPoint searchPoint = ((RealtimeFeature)_rtCursor.Current).GetShape() as MapPoint; searchPoint = GeometryEngine.Instance.Project(searchPoint, mapView.Map.SpatialReference) as MapPoint; var observer = new Camera(searchPoint.X, searchPoint.Y, 200, -22, searchPoint.SpatialReference, CameraViewpoint.LookAt); observer.ViewportHeight = 84; observer.ViewportWidth = 134; observer.Z = 100; observer.Pitch = 0; var viewshedAnalysis = new Viewshed(observer, 45, 60, 10, 600); if (_vwDict[featureId] != null) { await mapView.RemoveExploratoryAnalysis(_vwDict[featureId]); } _vwDict[featureId] = viewshedAnalysis; await mapView.AddExploratoryAnalysis(viewshedAnalysis); return(searchPoint); }