[GRASS-user] r.sun.daily ouputs

[Anna Petrášová]

Hi,


On Thu, Sep 28, 2017 at 5:30 AM,  <balotti.and at gmail.com> wrote:
> Hi,
> I am using  r.sun.daily to perform global radiation maps over a range of
> dates but I am a little bit confused about the outputs of this module.
> I created two outputs: the accumulated map of the whole time period and a
> temporal dataset with all the daily maps.
> I have tried to aggregate the daily maps in the temporal dataset with
> t.rast.series (average and sum) supposing that one of them was the same with
> the accumulated output of r.sun.daily but I was wrong.
> Here the query on a pixel: the first line is the accumulated map from
> r.sun.daily, the last two line are the aggregated maps from t.rast.series.
> sol_glob_veg at PERMANENT: value: 24291.95
> sol_veg_sum at PERMANENT: value: 1495683.87133789
> sol_veg_avg at PERMANENT: value: 6989.17696886865
>
> My question now is which kind of accumulation perform r.sun.daily?
> TIA

it just sums the maps from each day, so t.rast.series with sum should
give you the same results. I tested it in NC sample datatset and
indeed it gave me identical results. Could you test it in the sample
dataset and perhaps send the commands you are using?

Thank you,

Anna

>
> --
> Andrea Balotti
>
>
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