Extending Ground to Avoid Slope Errors
Updated April 13, 2022
This article applies to:
- RoadEng Civil
- RoadEng Forestry
In this example we will demonstrate how to fix solpe errors by extending the original topo surface.
SLOPE ERR
This error condition occurs when there is no intersection of the road template with topography. Typically this error condition occurs when the fill angle is shallower than the ground side slope (an infinite fill volume is created) or the cut angle is shallower than the side slope (infinite cut volume). It also will occur if the template falls off the edge of the TIN model (Figure 1, below).
Figure 1
Extend Ground Check Box
Set this check box to extend the draped ground cross section beyond the edge of the original ground Terrain surface (Topo). Press the associated button for more options in Section Extrapolate Ground Options.
Corridor | Options, check Extend Ground, click on the 
button.
Figure 2
Extrapolate distance
Distance to extend the ground beyond the edge of the Terrain.
Slope probe length
Distance used to extract a slope from the Terrain surface.
Slope probe offset
Distance from the edge of the surface to the outside probe point.
Figure 3
Click OK to Recalculate Range.
Figure 4
The error message is not longer displayed.
