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

[sanzoghenzo]

Hi Daniel, thanks for the help.
I did the analysis without horizons and restricting the region to a small area.
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.
It would be great to add a r.horizon-like-bufferzone option in r.sun!
Cheers

--  
Andrea Ghensi

Non controllo la posta spesso, se è urgente usa questo link: - https://awayfind.com/aghensi


Il giorno sabato 24 marzo 2012, alle ore 19.37, Daniel Lee [via OSGeo.org (http://OSGeo.org)] ha scritto:  

> 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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>  
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> Am 24. März 2012 13:59 schrieb sanzoghenzo <[hidden email] (/user/SendEmail.jtp?type=node&node=4652234&i=1)>:
> > 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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