I am trying to identify where cuttings and crevices exist by using a DTM or DSM.
My ultimate aim is to find where roads and rail lines sit within a cutting i.e. the land either side of them is higher than the road or rail network. If possible, I would like to identify the height difference between each road/rail and the top of the cutting, however, just finding the location of the cuttings would be great.
I have a line dataset and a polygon dataset showing me the roads and rails for my area.
My logic for this would be:
- Find the crevices / cuttings from the terrain data and generate a raster with 0 and 1 values. Where 1 is a cutting and 0 is everything else.
- Vectorise this raster to generate polygons for the 1 values.
- Union this with the road and rail dataset to find where the road and rail sit within the cutting.
By a cutting I mean something like this
I am not interested in this
It is at step 1 that I have hit a wall.
I would assume that some of the hydrology tools might be able to help me with this by modelling where water would flow. Does anybody have any suggestions?
I am using ArcGIS 10.2 with an Advanced Licence.