Esri/squad-leader-android

Document viewshed limitations

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garysheppardjr commented
  • Elevation dataset must be in same projection as map (this might already be documented).
  • For accuracy, choose a projection appropriate for the area of interest.
  • Web Mercator works and is popular because many map services and caches are in that spatial reference, but it is less accurate for viewshed the further you get from the equator.
  • This is GPU-based "visual analysis":
    • It performs very quickly.
    • It only works for the current map extent.
    • It provides a good approximation of the viewshed that is not as rigorous as you get from the ArcGIS viewshed geoprocessing tool, which is not available offline on Android.