I'm looking to calculate the slope of a raster in a specific direction. For example: if i am standing at a point and facing NE (45 degrees), what is the slope I would be looking up.
The math is not to bad, there's a great illustration here: An introduction to the directional derivative and the gradient - Math Insight
What I don't know how to do is calculate derivatives in arcgis.
Any help would be greatly appreciated.