Re: Using r.sun to get shadowed areas
Micha Silver <[email protected]>
| Newsgroups | gmane.comp.gis.grass.user |
|---|---|
| Message-ID | <[email protected]> |
Cheers! On 2017-11-22 23:48 PM, Anna Petrášová wrote: Yes, you are right, I fixed it, thank you. Anna On Wed, Nov 22, 2017 at 7:27 AM, Micha Silver <[email protected]> wrote: I'm using r.sun to extract shadowed areas from a LIDAR derived DTM for some date/hour combinations. (GRASS 7.2) According to the man page: "A map of shadows can be extracted from the solar incidence angle map (incidout). Areas with zero values are shadowed." In my output incidout raster, there are never values of zero. The minimum incident angles are quite small, but no zeroes. However the NULL pixels seem to be exactly the shadowed areas. (I am comparing with ortho-photos taken at those specific dates and hours). Am I mistaken, or should the documentation be changed to "Areas with NULL values are shadowed". Thanks -- Micha Silver Ben Gurion Univ. Sde Boker, Remote Sensing Lab cell: +972-523-665918 _______________________________________________ grass-user mailing list [email protected] https://lists.osgeo.org/mailman/listinfo/grass-user -- Micha Silver Ben Gurion Univ. Sde Boker, Remote Sensing Lab +972-523-665918 _______________________________________________ grass-user mailing list [email protected] https://lists.osgeo.org/mailman/listinfo/grass-user