Terrain elevation prequel (Water Overlay)

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This prequel serves as a replacement for the DTM, which is the elevation model without the Buildings. The Water Overlay will still add the heights of any Buildings present, in accordance with the set DESIGN_FLOOD_ELEVATION M.


  • IMPORTANT: This prequel Overlay must be set to inactive in order to function properly!
  • The values in this prequel grid are clamped between -10000.0 and 10000.0. No data values are not allowed.
  • Any Grid Overlay used as input for this prequel should cover the project area completely, without any NO_DATA values. If the dataset used does contain NO_DATA values, it is prudent to use a Combo Overlay or an Average Overlay to fill up any NO_DATA values, and use that Grid Overlay as input for this prequel instead.

See also