Re: [Qgis-user] compute spatial derivatives from raster bands
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, exposing the derivatives directly requires a small development but it is definitely possible. On Sat, Dec 29, 2018, 06:37 Lee Eddington I’m fairly new to QGIS and would like to compute spatial derivatives > (d/dx, d/dy) of raster band data. Is there a tool, computational interface > or plugin that does this already? > > Thanks, > Lee > > ___ > Qgis-user mailing list > Qgis-user@lists.osgeo.org > List info: https://lists.osgeo.org/mailman/listinfo/qgis-user > Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user ___ Qgis-user mailing list Qgis-user@lists.osgeo.org List info: https://lists.osgeo.org/mailman/listinfo/qgis-user Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
Re: [Qgis-user] compute spatial derivatives from raster bands
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 wrote: I’m fairly new to QGIS and would like to compute spatial derivatives (d/dx, d/dy) of raster band data. Is there a tool, computational interface or plugin that does this already? Thanks, Lee ___ Qgis-user mailing list Qgis-user@lists.osgeo.org List info: https://lists.osgeo.org/mailman/listinfo/qgis-user Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user -- Micha Silver Ben Gurion Univ. Sde Boker, Remote Sensing Lab cell: +972-523-665918 ___ Qgis-user mailing list Qgis-user@lists.osgeo.org List info: https://lists.osgeo.org/mailman/listinfo/qgis-user Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
