[GRASS-user] r.sun on a small portion of my region

[sanzoghenzo]

Hi all,
I'm trying to analyze the sun radiation of a garden in my town (
http://g.co/maps/p56kn )
I got LIDAR DTM with 1mx1m resolution from the local administration.
To get in account the shadowing effect of the terrain I have to set a big
region, and r.sun calculates the radiation of all the region.
I red about r.horizon and the bufferzone option, so I could calculate the
horizon line first. But from what I understood r.horizon adds inaccuracy to
the calculation.
Is there something like bufferzone in r.sun? or should I go with r.horizon
and accept a less accurate result?

Regards,
Andrea

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