Hello, First of all, I'm new to this mailinglist and to GrassGIS in general.
So, I'm trying to use the `r.sunmask` command in order to extract the shadow from an `SRTM DEM` of the Alps mountains (Switzerland). The image had to be first `reprojected` when I've imported it to a `EPSG:21781` location, in order to get both the (lat, lon) in meters (similarly to the elevation). Here is the command I'm executing (note that the time of the day was chosen at 09:00 in the morning to maximize the shadow): r.sunmask elevation=n46_e006_1arc_v3@PERMANENT output=alps-sunmask.tif year=2014 month=9 day=23 hour=9 minute=0 timezone=1 The problem I have is that the image produced is emtpy (no-data everywhere). Is there a parameter I'm forgetting to add to the `r.sunmask` command? Or should I use `r.sun` command instead, even though I'm not sure about the parameters I should provide to it either ? Hakim.
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