I think there's an error in the docs of the r.viewshed addon. It states that the default output raster contains vertical angle relative to the observer and that the values are:
"a value in [0, 180] representing the vertical angle with regard to the viewpoint, in degrees, if the point is visible. 0 degrees: directly above the observer, 180 degrees: directly below the observer" [1] It's the opposite of r.los, where 0 is below and 180 right above. The resulting maps are equivalent, and looking to my results r.los interpretion is right. giovanni [1] https://svn.osgeo.org/grass/grass-addons/grass6/raster/r.viewshed/r.viewshed.html -- Giovanni Allegri http://about.me/giovanniallegri Twitter: https://twitter.com/_giohappy_ blog: http://blog.spaziogis.it GEO+ geomatica in Italia http://bit.ly/GEOplus
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