How to adjust the height map with a Combo Overlay: Difference between revisions

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File:Add_AVG_Overlay1.jpg|2.Add an Average Overlay that selects a specified attibute - NWB_ID.
File:Add_AVG_Overlay1.jpg|2.Add an Average Overlay that selects a specified attibute - NWB_ID.
File:Add_Combo_Overlay1.jpg|3. Add a Combo Overlay with the Height Map Overlay as input A, and the Avg Overlay as input B.
File:Add_Combo_Overlay1.jpg|3. Add a Combo Overlay with the Height Map Overlay as input A, and the Avg Overlay as input B.
File:construction6.jpg|4. This Combo Overlay displays a height map with all roads (with NWB_ID as attribute) 2cm lower, and all other areas as they were.
File:Combo_Overlay2.jpg|4. This Combo Overlay displays a height map with all roads (with NWB_ID as attribute) 2cm lower, and all other areas as they were.
File:construction6.jpg|5 .Now use the Combo overlay in Current Situation > Terrain > Select Elevation Grid
File:Add_Overlay_As_Terrain1.jpg|5 .Now use the Combo overlay in Current Situation > Terrain > Select Elevation Grid
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Revision as of 14:54, 11 April 2022

Please note: This page is currently being updated.

It is now possibe to change the Digital Terrain Model (DTM) of a project, by using a Combo Overlay.

In the following example the roads of the project area will be lowered with 20cm.

How to adjust the height map with a combo overlay.:
  1. Add a DTM Height Map Overlay to your project.
  2. Add an Average Overlay that selects a specified attibute. This can be a custom attribute or a more general one, such as NWB_ID.
  3. Add a Combo Overlay with the Height Map Overlay as input A, the Avg Overlay as input B, and with the formula: IF(GT(B, 0), SUB(A, 0.2), A).
  4. This Combo Overlay displays a height map with all roads 2cm lower, and all other areas as they were.
  5. Now use the Combo overlay in Current Situation > Terrain > Select Elevation Grid Overlay to implement the change on the elevation model and visualisation.


  • 1. Add a DTM Height Map Overlay to your project.

  • 2.Add an Average Overlay that selects a specified attibute - NWB_ID.

  • 3. Add a Combo Overlay with the Height Map Overlay as input A, and the Avg Overlay as input B.

  • 4. This Combo Overlay displays a height map with all roads (with NWB_ID as attribute) 2cm lower, and all other areas as they were.

  • 5 .Now use the Combo overlay in Current Situation > Terrain > Select Elevation Grid

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