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

[Daniel Lee]

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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