[GRASS-dev] Linke turbidity in r.sun.daily

[Nikos Alexandris]

Nikos Alexandris wrote:

> ...
>>>> #% description: Name of the Linke atmospheric turbidity 
>>>> coefficient input
>>>> raster map
>>>> #% required : no
>>>> #%end

Vaclav Petras wrote:

>>> This does not seem correct. Run
>>> r.sun --script

Nikos Alexandris:

>> Hmm, ok. Still, why "cell" for Linke-T? Linke-Ts are floats.

Markus Neteler wrote:

> Where do you see that "cell"?
>
> r.sun --script
> ...
> #%option
> #% key: linke_value
> #% type: double
> #% required: no
> #% multiple: no
> #% description: A single value of the Linke atmospheric turbidity
> coefficient [-]
> #% answer: 3.0
> #% guisection: Input
> #%end
> ...

Yes, linke_value is a single value. Yet, just *above* that:

#%option
#% key: linke
#% type: string
#% required: no
#% multiple: no
#% description: Name of the Linke atmospheric turbidity coefficient 
input raster map [-]
#% gisprompt: old,cell,raster
#% guisection: Input
#%end

"linke" is for raster maps as input.  Some are here 
<http://www.soda-is.com/eng/services/climat_free_eng.php#c5>: eg. 
<http://www.soda-is.com/doc/linke_turbidity/first_trimester.zip>.  The 
values in this maps (and the rest of the kind) are multiplied by 20, see 
<http://www.soda-is.com/eng/services/linke_turbidity_maps_info.html>.  
Unfortunately, they aren't GeoTIFFs, I think.  I am trying to find out 
how to get'em appropriately georeferenced.

Nikos