[GRASS-user] t.rast.aggregate

[Sören Gebbert]

Hi Veronica,

2014-04-01 16:07 GMT+02:00 Veronica Andreo <veroandreo at gmail.com>:
> Hi Soeren,
>
> 2014-03-31 13:05 GMT-03:00 Sören Gebbert <soerengebbert at googlemail.com>:
>> 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')"
>
> Thanks so much for your help! Worked perfectly just removing the
> underscore in 'start of year'

Ooops, sorry for the underscore's.

>
> Have one question though: is there a way to check which maps were used
> to estimate the average (or whatever operation t.rast.series perform)?
> Is that information stored somewhere? or is there a way to check prior
> to t.rast.series??

You can use the same SQL expression in any other temporal command that
support SQL where expressions. For example t.rast.list:

{{{
t.rast.list input=precipitation_1950_2013_monthly_mm at soeren
where="start_time = datetime(start_time, 'start of year', '0 month')"

precipitation_monthly_mm_0 soeren 1950-01-01 00:00:00 1950-02-01 00:00:00
precipitation_monthly_mm_12 soeren 1951-01-01 00:00:00 1951-02-01 00:00:00
...
precipitation_monthly_mm_732 soeren 2011-01-01 00:00:00 2011-02-01 00:00:00
precipitation_monthly_mm_744 soeren 2012-01-01 00:00:00 2012-02-01 00:00:00
precipitation_monthly_mm_756 soeren 2013-01-01 00:00:00 2013-02-01 00:00:00
}}}


Best regards
Soeren

>
> Thanks again!
> Best,
>
> Vero