[GRASS-user] r.sun for multiple days

[Vaclav Petras]

On Tue, Jul 8, 2014 at 5:27 PM, Tyler Smith <tyler at plantarum.ca> 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
> grass-user at lists.osgeo.org
> http://lists.osgeo.org/mailman/listinfo/grass-user
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.osgeo.org/pipermail/grass-user/attachments/20140708/3ddf9487/attachment.html>