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

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


{{Editor steps|title=adjust the height map with a combo overlay.|Add a DTM Height Map Overlay to your project.|Add an [[Average Overlay]] that selects a specified attibute. This can be a custom attribute or a more general one, such as NWB_ID.|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), NO_DATA).|This Combo Overlay displays a height map with all roads 2cm loewer, and all other areas as 'NO_DATA'.|}}
{{Editor steps|title=adjust the height map with a combo overlay.|Add a DTM Height Map Overlay to your project.|Add an [[Average Overlay]] that selects a specified attibute. This can be a custom attribute or a more general one, such as NWB_ID.|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), NO_DATA).|This Combo Overlay displays a height map with all roads 2cm loewer, and all other areas as 'NO_DATA'.|Now use the Combo overlay in Current Situation > Terrain > Select Elevation Grid Overlay to implement the change on the elevation model and visualisation.}}
 
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These steps can be created by using the "Editor steps" template:
 
{{Template description|Editor steps|title&#61;title|Step|Step|Step...}}
 
<gallery mode="nolines">
<gallery mode="nolines">
File:construction5.jpg|A landmark
File:Add_DTM_Overlay1.jpg|1. Add a DTM Height Map Overlay to your project.
File:construction6.jpg|Another landmark
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:construction6.jpg|4. This Combo Overlay displays a height map with all roads 2cm loewer, and all other areas as 'NO_DATA'.
File:construction6.jpg|5 .Now use the Combo overlay in Current Situation > Terrain > Select Elevation Grid
</gallery>
</gallery>

Revision as of 14:10, 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), NO_DATA).
  4. This Combo Overlay displays a height map with all roads 2cm loewer, and all other areas as 'NO_DATA'.
  5. Now use the Combo overlay in Current Situation > Terrain > Select Elevation Grid Overlay to implement the change on the elevation model and visualisation.