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

[Dylan Beaudette]

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
-------------- next part --------------
A non-text attachment was scrubbed...
Name: cucumo-estimated_daily_linke_values.png
Type: image/png
Size: 47193 bytes
Desc: not available
Url : http://lists.osgeo.org/pipermail/grass-user/attachments/20061206/b9fbd966/cucumo-estimated_daily_linke_values.png