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In GRASS GIS 7, there is r.skyview addon for sky-view factor, which is very similar to openness. You can check the implementation details here. Download the addon with g.extension r.skyview.


You can use a little bit of python to do this but you need first to generate a dictionary or table, from your observers position, of the angle to the real world horizon seems to be at. This would need to be at say 1 degree intervals with 0 = true north and for each degree giving the angle of the horizon. This can come from your r.horizon. You could then, ...

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