Does -kill Use 3D or 2D Distances?

[Spencer Floyd]

Hi,

I think I know the answer after some testing, but I'd like to know if the -kill parameter (specifically in blast2dem), uses 2D distances or 3D distances.

With geometric ground classification sometimes struggling with steep areas (often getting missed) I was hoping to use a small -kill value to identify these kind of areas that would show as voids in the resulting DEM. Paired with a slope raster and a certain slope threshold, hopefully these areas can be easily found.

Here is an example of the difference between 2D and 3D distances: 

If the -kill parameter isn't currently using 3D distances, is that something that could be added? 

Thanks in advance.

Spencer