[GRASS-user] t.rast.aggregate

[Sören Gebbert]

Hi Veronica,
you can use t.rast.series for this kind of task. Use a SQL expression
to select only specific months of a year. Please try this code
(untested, may contain errors):

# January averages
t.rast.series input=monthly_aggregates \
    output=jan_average method=average \
    where="start_time = datetime(start_time, 'start_of_year', '0 month')"

# February averages
t.rast.series input=monthly_aggregates \
    output=feb_average method=average \
    where="start_time = datetime(start_time, 'start_of_year', '1 month')"

# March averages
t.rast.series input=monthly_aggregates \
    output=mar_average method=average \
    where="start_time = datetime(start_time, 'start_of_year', '2 month')"

...


Best regards
Soeren

2014-03-31 17:43 GMT+02:00 Veronica Andreo <veroandreo at gmail.com>:
> Hi all,
>
> I have this MODIS time series of 8-day composite of chlorophyll
> concentration from 2003 to 2013. I've already aggregated it by month
> (average), so from 506 images I now have 132 (12 x year, 11 years)
>
> but what I need doing now is to aggregate months over the years, what
> i want are 12 summary images (one for each month over the 11 years).
> How do i do that with t.rast.aggregate?
>
> Thanks a lot in advance! And CONGRATULATIONS on GRASS 7 release!! :)
>
> Vero
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