On Sun, Nov 18, 2018 at 10:32 PM Micha Silver <[email protected]> wrote: > > I am preparing a correlation matrix for 7 raster layers. The results using > the r.covar module are different from the R layerStats function. I suspect > this is due to handling of null cells. The R function has a parameter to > remove NA cells, but the GRASS module, I think, just loops over all cells, > including no value. > > > Can anyone confirm that GRASS does not deal with null cells, and that this > would cause the difference in correlation results?
Here how r.covar treats NULL cells: https://trac.osgeo.org/grass/browser/grass/trunk/raster/r.covar/main.c#L93 Markus _______________________________________________ grass-user mailing list [email protected] https://lists.osgeo.org/mailman/listinfo/grass-user
