Hi Daniel, thanks for the help.
<br/>I did the analysis without horizons and restricting the region to a small area.
<br/>Maybe the results are not so accurate (at 21 of december it says I got 10 hour of sun, but I think the mountain that sits at 3km in western direction reduces significantly the hours of sun) but for now I can live with that.
<br/>It would be great to add a r.horizon-like-bufferzone option in r.sun!
<br/>Cheers
<br/><br/>--
<br/>Andrea Ghensi
<br/><br/>Non controllo la posta spesso, se è urgente usa questo link: - <a href="https://awayfind.com/aghensi" target="_top" rel="nofollow" link="external">https://awayfind.com/aghensi</a><br/><br/><br/>Il giorno sabato 24 marzo 2012, alle ore 19.37, Daniel Lee [via OSGeo.org (<a href="http://OSGeo.org" target="_top" rel="nofollow" link="external">http://OSGeo.org</a>)] ha scritto:
<br/><div class='shrinkable-quote'><br/>> Hi Andrea,
<br/>>
<br/>> 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!
<br/>>
<br/>> Daniel
<br/>>
<br/>>
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<br/>> --
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<br/>> Am 24. März 2012 13:59 schrieb sanzoghenzo <[hidden email] (/user/SendEmail.jtp?type=node&node=4652234&i=1)>:
<br/>> > Hi all,
<br/>> > I'm trying to analyze the sun radiation of a garden in my town (
<br/>> > <a href="http://g.co/maps/p56kn" target="_top" rel="nofollow" link="external">http://g.co/maps/p56kn</a> )
<br/>> > I got LIDAR DTM with 1mx1m resolution from the local administration.
<br/>> > To get in account the shadowing effect of the terrain I have to set a big
<br/>> > region, and r.sun calculates the radiation of all the region.
<br/>> > I red about r.horizon and the bufferzone option, so I could calculate the
<br/>> > horizon line first. But from what I understood r.horizon adds inaccuracy to
<br/>> > the calculation.
<br/>> > Is there something like bufferzone in r.sun? or should I go with r.horizon
<br/>> > and accept a less accurate result?
<br/>> >
<br/>> > Regards,
<br/>> > Andrea
<br/>> >
<br/>> > --
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