Virtual surveyor can help you to align you photogrammetry outputs with your elevation datum.
The proper elevation datum needs to be set in your photogrammetry process. That is the processing step before you start working in Virtual Surveyor. Nevertheless, most of the time your image processing software only exports Ellipsoidal height unless you use GCPs or adjust the 3D model thanks to a global or local geoid model.
Virtual Surveyor provides an easy way to adjust your data to local heights. Keep in mind this process is not suited to larger areas!
- Draw a boundary around the area of interest.
- Clip the terrain with that boundary item.
- Select the boundary and go to the SELECTION TOOLS tab.
- Set the offset value in the Terrain group.
- Click on Offset Within.
Drag and drop your drone survey dataset (Orthophoto + DSM) into the project view to create a Terrain State.
Area of interest clipping
Draw a boundary around your entire site to define your area of interest. Select that boundary together with your drone survey (DSM and Ortho) and go to the SELECTION TOOLS tab. Click on Clip button.