[GRASS-user] r.sun annual radiation

Salvatore Mellino salvatore.mellino at gmail.com
Tue Sep 6 14:13:14 EDT 2011

Sorry again,

I forgot to ask you about the Linke turbidity atmospheric coefficient. Is it included into the script? and which is the value used? (3.0 ?)

Thanks again,


Il giorno 06/set/2011, alle ore 19:53, Markus Neteler ha scritto:

> On Tue, Sep 6, 2011 at 7:20 PM, Salvatore Mellino
> <salvatore.mellino a gmail.com> wrote:
>> now I can't verify in which way the sun map made with arcGIS was done (albedo,
>> atmospheric turbidity…) maybe the differences depend on terrain shadow effect
>> that I have not considered in grass map.
> Depending on your terrain that can make a huge difference.
> See for example (Alpine region next to my home):
> http://gis.cri.fmach.it/gis-analysis/
> -> Solar radiation based on high resolution DEM
>> If I want to add this effect to your script for global radiation, how can I do?
> Just add the -s flag to r.sun.
>> And moreover,  will your script calculate automatically  slope and aspect from DTM or it use the default values?
> It calculates slope and aspect from DTM automatically.
> Markus

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