[GRASS-user] r.sun annual radiation

[Salvatore Mellino]

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,

Salvatore




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