[GRASS-user] r.sun with shadowing effects

[Hamish]

Odoardo Zecca wrote:

> I need to calculate the solar radiation (with r.sun) of a relatively small
> area taking into account the shadowing effect of reliefs spread in a much
> larger area. In order to be able to get a high resolution map of the area of
> interest, or even just the values relatives to some particular sites, is
> there a way to avoid the long computational time needed for areas I'm not
> interested in?

I don't think so (at least not without modifying the code), but I would be
interested in the same functionality.

> May be I can use r.los for selecting the reliefs that actually cast a shadow
> on the area of interest?

That would be ok for the beam radiation, but you might affect the diffuse and
reflective radiation calculations that way. ?


Hamish



       
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