[GRASS-user] Re: [GRASS-dev] Changes to r.sun made Feb 2006 [resolved]

Dylan Beaudette dylan.beaudette at gmail.com
Wed Dec 6 19:29:40 EST 2006


On Tuesday 05 December 2006 23:42, Hamish wrote:
> Dylan Beaudette wrote:
> > > Get local Linke values from the SoDa Solar radiation Databases
> > >   http://www.soda-is.com/
> >
> > Tried this, and got unrealistic values for my site.
>
> how so? Have you calculated good Linke values from your light meters?
> (formula for that, please?)
>
> beware some LICOR meters return PAR (400-700nm) and some full spectrum.
> The PAR measurements should be adjusted before comparison with r.sun
> results to compensate for the missing wavelengths (but fortunately
> evolution has calibrated plants (and eyes) pretty well to match the
> sun's dominant energies).
>
>
> Hamish

Hi Hamish

An update:

Attached is a plot of estimated Linke turbidity values, compared to the SoDa 
derived data. Details on this calculation soon to follow in a new thread.

cheers,

-- 
Dylan Beaudette
Soils and Biogeochemistry Graduate Group
University of California at Davis
530.754.7341
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