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Creating Sub-Suface Layers From Multiple Terrain Files

Updated January 17, 2017

This article applies to:
  • RoadEng Civil
  • RoadEng Forestry

A DTM surface (for example soil/rock interface) in a Terrain file, can be defined as a Sub-Surface layer. Material volumes above and below the surface will be calculated separately. You can have up to 3 layers (up to two surfaces below topo).

First you need to define the sub-surface Terrain:

1. In the Location module, choose menu Module-Setp, Alignment tab.

2. Press the reference Terrains button:

Figure 1 - Location Module Setup

3. Select Sub Surface 1 and Browse for the Terrain file:

Figure 2 - Selection of Reference Terrain Files

4. Press OK and OK again to accept and close.

Then, you need to use the new sub-surface terrain to define your layer depth:

5. Choose menu Edit-Assign Parameters by Range, Sub Horizons tab.

6. Press the "+" button beside Ground Layers:

Figure 3 - Assign Parameter By Range, Sub Horizons

7. Choose Layer 2 Ground Type, then set the Use Surface check box and pick a Sub surface from the list:

Figure 4 - Configuring Ground Layers to Reference Terrains

8. Press OK; note that your ground layers are now defined with "SUB1" as the depth value:

Figure 5 - Defined "Depth" for Ground Layers

9. Adjust your station range and and press the Add/Edit button.

10. Press OK and re-calculate.