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 clear="all">
<p style="margin-top:0px;margin-bottom:0px;margin-left:0px;margin-right:0px;text-indent:0px"><span style="font-family:arial,sans-serif;font-size:13px;background-color:rgb(255,255,255)"></span></p><p>--<br></p><p>B.Sc. Daniel Lee<br>
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<br><br><div class="gmail_quote">Am 24. März 2012 13:59 schrieb sanzoghenzo <span dir="ltr"><<a href="mailto:andrea.ghensi@gmail.com">andrea.ghensi@gmail.com</a>></span>:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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="_blank">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>
--<br>
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