Your project area is covered with snow and you want to lower your surface terrain by a certain distance to compensate for the height offsets. You can do this by applying an offset to your terrain.

Quick Usage Guide

  1. In the Viewport, draw a Boundary around the area of terrain you want to adjust.
  2. Select the Boundary and go to the TOOLS for Boundary tab.
  3. In the Terrain group, set the Level to the elevation difference you want to apply relative to the current situation. 
    1. For example, if you want the terrain to be located 10 cm lower, set it to -0.10 m.
  4. Click Offset Within.
  5. The terrain within your selected boundary is moved 10 cm lower. Since the newly surveyed items drape the terrain, they are now placed 10 cm lower as well.

 (The offset terrain in this illustration is exaggerated beyond 10 cm to showcase the effect). 

Tips and Tricks

  • Objects (points, polylines, surfaces...) placed on the terrain before you apply the offset, do not automatically follow the offset. The best practice is to first offset the terrain and then create your survey items on the offset terrain.
  • You can turn the Offset Within terrain effect off via the Project View and the terrain will return to its original state.
  • Note differences between the Offset Within and Modify Terrain functions. While they might look similar in practice, they create different results. 
    • When you Offset Within, the variability of your terrain within the created boundary is preserved. 
    • When you Modify Terrain, the variability of your terrain matches the surrounding ground level.