Keep Outside is a surface item modification tool for removing a specific area from a surface. Virtual Surveyor allows you to do this by keeping triangles within a selected boundary. You can create a hole in the surface item so no contours are generated within the selected boundary.

The Keep Outside button appears in the TOOLS tab and only works if both a surface and a boundary are selected. 

Quick Usage Guide

  1. Select both the surface and the boundary (hold Ctrl on your keyboard when clicking the items).
  2. Go to the SELECTION TOOLS tab.
  3. Click Keep Outside.
  4. The triangles inside the boundary are removed from the surface. 
    1. The triangles crossed by the boundary are cut out to fit within the boundary.

Where to Use the Keep Outside Tool

  • Use the Keep Outside tool to remove sections within a surface item and avoid drawing contours within building or water bodies.

Tips and Tricks

  • The elevation of the removed surface remains the same as the original surface. 
    • The elevations of the boundary vertices are not included in the surface item.
  • Using Keep Outside to remove the internal part of the surface deletes it from your project.
  • It is possible to remove the inside of multiple boundaries within a surface at the same time by selecting the surface along with multiple boundaries.