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 -- B.Sc. Daniel Lee Geschäftsführung für Forschung und Entwicklung ISIS - International Solar Information Solutions GbR Vertreten durch: Daniel Lee, Nepomuk Reinhard und Nils Räder Deutschhausstr. 10 35037 Marburg Festnetz: +49 6421 379 6256 Mobil: +49 176 6127 7269 E-Mail: [email protected] Web: http://www.isi-solutions.org ISIS wird gefördert durch die Bundesrepublik Deutschland, Zuwendungsgeber: Bundesministerium für Wirtschaft und Technologie aufgrund eines Beschlusses des Deutschen Bundestages, sowie durch die Europäische Union, Zuwendungsgeber: Europäischer Sozialfonds. Zusätzliche Unterstützung erhält ISIS von dem Entrepreneurship Cluster Mittelhessen, der Universität Marburg, dem Laboratory for Climatology and Remote Sensing und dem GIS-Lab Marburg. Am 24. März 2012 13:59 schrieb sanzoghenzo <[email protected]>: > 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 > > -- > View this message in context: > http://osgeo-org.1560.n6.nabble.com/r-sun-on-a-small-portion-of-my-region-tp4651554p4651554.html > Sent from the Grass - Users mailing list archive at Nabble.com. > _______________________________________________ > grass-user mailing list > [email protected] > http://lists.osgeo.org/mailman/listinfo/grass-user >
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