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?
Thanks for any suggestions!
--
Tyler Smith
On Tue, Jul 8, 2014 at 5:27 PM, Tyler Smith <tyler@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
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