Your project area is covered with snow or has a tall vegetation layer and you want to lower your surface terrain by a certain distance to compensate for these height offsets. You can do this by applying an offset to your terrain.
Quick Usage Guide
- Draw a boundary around the area you want to adjust.
- Select this boundary within the viewport or the project view.
- Go to TOOLS tab.
- In the terrain group, set the Level box to the elevation difference you want to apply relative to the current situation. For example, if you want the terrain to be located 10 cm lower set it to -0.10 m.
- Click the 'Offset Within' button.
- The terrain within the selected polygon is moved 10 cm lower. Since newly survey items drape the terrain, they will be placed 10 cm lower as well. The effect is exaggerated in the illustration below for the purpose of clarity.
Tips and Tricks
- Objects (points, polylines, surfaces...) placed on the terrain before apply the offset do not automatically follow the offset. Best practice is to first offset the terrain and then create your survey items on it.
- You can turn the offset off via the project view. The terrain will return to its original state.
- Note that with the 'Offset Within', the variability of your terrain within the polygon is preserved. This is not the case when you use the 'Modify Terrain' operation.