[GRASS-user] r.sun with shadowing effects

[Markus Neteler]

HamishB wrote:
> 
> 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.
> 

There is some hope: from JRC I received an unpublished r.sun2 + r.horizon
which separates (the slow) horizont calculation from the (much faster) 
energy
calculations. Run r.horizon once and then r.sun2 as often as you need.

I'll check if I can put it into GRASS Addons SVN.

Markus
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