Hi,
QGIS core (the analysis library) do not expose such function directly, but
it does have methods to compute derivatives that are internally used by all
the "9 cells" algorithms (slope, aspect, ruggedness and hillshade) and the
derivative calculation is accelerated by OpenCL if available,
If you're wiling to try GRASS GIS, then the module r.slope.aspect
can output E-W and N-S derivatives using the dx=
and dy= output parameters. See:
https://grass.osgeo.org/grass74/manuals/r.slope.aspect.html
On 12/29/18 7:37 AM, Lee Eddington
