On Fri, Aug 15, 2014, at 04:30 PM, Markus Neteler wrote: > On Thu, Aug 14, 2014 at 8:42 AM, roy <royr...@outlook.com> wrote: > > > > Il 13/08/2014 22:46, Tyler Smith ha scritto: > > > >> but I can't figure > >> out how to limit the analysis to these spots. Is it possible? Does > >> anyone have any suggestions? > >> > > Hi Tyler, > > > > you sure can use the region settings and the r.mask GRASS module to > > limit the analysis area: > > > > use > > "g.region" and "r.mask" > > Keep in mind the shading effect of surrounding mountains which > requires that the area must be larger than the pixel of interest. > You could calculate the viewshed with r.viewshed in order to estimate > the minimum area to be considered for a pixel. > Then put all into a loop. >
That's a good idea, thanks. At the moment I've got r.horizon running on a server (12CPU, 32G RAM). I broke the area up into a dozen overlapping areas, and it seems to be working. When I get to r.sun I may try scripting a loop as you've suggested. Best, Tyler _______________________________________________ grass-user mailing list grass-user@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-user