Patrick, On Fri, Oct 19, 2012 at 5:50 PM, Patrick S. <[email protected]> wrote: > r.sun -s elevin=r_dem incidout=r_sun_shadow aspin=r_aspect slopein=r_slope > day=80 time=17 --o
I would leave the slope and aspect calculation to the module. Be sure to set the computational region properly before running the module: # check if the resolution and extent are as desired, note that in # mountainous areas the region must be larger to catch all # shadows, use r.los or r.viewshed to get an idea about that: g.region rast=r_dem -p r.sun -s elevin=r_dem incidout=r_sun_shadow day=80 time=17 r.mapcalc "shadows = if (r_sun_shadow == 0, 1, null() )" No idea about the gradient you reported, you need to tell us more about your study area and its size. Markus _______________________________________________ grass-user mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/grass-user
