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

Daniel Lee lee at isi-solutions.org
Sat Mar 24 15:36:38 EDT 2012


Hi  Andrea,

I'd either buffer the garden you're trying to analyze by about 500m or so
and then run the analysis on the buffer area or set the regional settings
to cover a smaller area of your DSM. I believe r.sun uses the computational
region you set. For such a small area I honestly wouldn't bother with
horizon maps. You were probably thinking of using the mode of r.horizon
that makes horizons for a specific point, but that's not the type that
r.sun uses as input. It uses a number of rasters. For such a small area,
though, it won't make a difference - you should just make slope and aspect
maps and then use those, together with the surface model, as inputs for
r.sun. Hope that helps!

Daniel

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Am 24. März 2012 13:59 schrieb sanzoghenzo <andrea.ghensi at gmail.com>:

> 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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