On Tue, Jul 8, 2014 at 5:27 PM, Tyler Smith <[email protected]> wrote:
> Hello, > > I'm preparing some maps for use in a MAXENT ecological niche modelling > analysis. We're going to use solar radiation as one of the predictors, > so will be using the GRASS r.sun command to generate our input rasters. > > r.sun provides the solar radiation for a single day of the year. My > question is, what's the best way to get a summary for the entire year? A > simple solution would be to run it for every day, then sum or average > the values. That seems likely to be very processor intensive, and I > assume the result would be very similar to using every other day, or > every third day. Is there a standard procedure for doing this? > > Hello, I'm the co-author of r.sun.hourly and r.sun.daily modules which wraps r.sun. They are available in GRASS GIS 7 addons repository (and might work in GRASS GIS 6 too). They might be helpful for you. However, this does not answer your question and I myself would be interested in what are the right/bast ways and would be glad to improve the modules if something should be changed or improved. http://grass.osgeo.org/grass70/manuals/addons/r.sun.daily.html https://svn.osgeo.org/grass/grass-addons/grass7/raster/r.sun.daily/ The basic idea of r.sun.daily was taken from examples from "GRASS book": http://www.grassbook.org/examples_menu.php http://www.grassbook.org/examples_menu2nd.php Vaclav > Thanks for any suggestions! > > -- > Tyler Smith > _______________________________________________ > grass-user mailing list > [email protected] > http://lists.osgeo.org/mailman/listinfo/grass-user >
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