Hi,

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.

Thanks,

Dave

Hi Dave,

I don't have knowledge on Directional derivetives.

Check the link below, which also mentions computation of directional derivative in ArcGIS (they used ver. 8.x),

Arc8.1 ArcMap Commands for Computing USPED using GIS

Hope it is helpful!

Thanks,

Jay