Road Crossings
Original topography
Craters over road prism.
Requires accurately located digitized points for road crossings.
Typically takes several iterations:
1.Create a stream layer.
2.Manually check that all road diversions are
resolved. If any are missed, add or move
points, generate new stream layer.
3.Repeat until all diversions are dealt with.
5-m DEM
Road Crossings: Bomb-crater strategy.
The “bomb-crater” strategy allows us to use a point file of culverts, for example, that has some spatial error. The culvert points don’t have to be perfectly located over the road prism.