Added "backlink" functionality to r.walk, r.cost & r.drain
|Reported by:||cnielsen||Owned by:|
I have updated the r.walk, r.cost and r.drain modules to include "back-link raster" functionality. Currently the path created by r.drain does not necessarily take THE path through a cost surface, that the cost accumulation algorithm took to generate that cost surface. My updates add an "outdir" raster as an output from the r.drain and r.cost modules which creates a backlink raster, or a raster surface of the movements made to create the cost surface (recorded in degrees). I then modified r.drain to read this surface when it's given the "-d" flag.
I have tested it on my win32/vista build (mingw/msys), but not on linux or mac builds. Since this is my first patch, I have added extensive commenting which can probably be removed later.