This dialog box is available from the Corridor ribbon Options button or Horizontal - Options. You can also right click in the Project Explorer tree and select Options - Horizontal from the context menu.
Section Extension
Extend Ground (check box and button)
Set this check box to extend the draped ground cross section beyond the edge of the original ground Terrain surface. Press the accociated button for more options in Section Extrapolate Ground Options.
This has no effect on P-Line designs (designs without an associated original ground Terrain surface).
This operation will fail on cross sections where the alignment centerline is not on the Terrain surface.
P-Line
File name and Browse (button)
If a P-Line traverse is accociated with the current alignment, the file name will be displayed here. Use the Browse button to change the file or add one if there is currently no associated file.
More options available from the Alignment Setup tab in Setup - Location Setup.
Reference
Terrains/Surfaces (button)
This button will open the Reference Terrains/Surfaces, dialog box, allowing you add and configure of reference Terrain files and Corridor Surfaces.
Features (button)
This button will open the Reference Features, dialog box, allowing you add and configure reference features for display (projected/intersected) or for template control.
Dynamic surface calculation (checkbox)
If checked, corridor surfaces will be automatically updated whenever changes are made.