Hi Isabelle, Marcos,
Thanks for pointing this out. We will have a look and either change the
variable names so they aggregate correctly, or split into separate
aggregations.
Thanks!
Steve
On Tue, Apr 17, 2012 at 9:27 PM, Marcos Hermida
<mhermida@xxxxxxxxxxxxxxxx>wrote:
> Hi Isabelle,
>
> if you look into the monthly files for that catalog (
> http://www.ncdc.noaa.gov/**thredds/catalog/gpcp/monthly/**catalog.html<http://www.ncdc.noaa.gov/thredds/catalog/gpcp/monthly/catalog.html>)
> there are to types of files gpcp_v2.2_esg.YYYY.gz and gpcp_v2.2_psg.YYYY.gz.
> Both types of files range from 1979 to 2010 and contain a variable with
> the same name (precipitation) so I am afraid that the aggregation
> aggregates both in one single series that goes from 1979 to 2010 and then
> again from 1979 to 2010 and when you request data from any date up to the
> last available date (2010-12-01) the Netcdf Subset Service finds the first
> occurrence of 2010-12-01 in the series but the next date available is
> 1979-01-01 that is before than the last date requested so it keeps writing
> data into the response until the second occurrence and you end up getting
> that file that contains your requested times + 384.
> One trick, but you'll miss the 2010-12-01 date, is request data from
> 1991-01-01 to 2010-11-01.
> Since we don't have control on that THREDDS server I'm ccing Steve Ansari
> who is the contact that appears in the WMS capabilities document and
> perhaps he is more helpful.
>
> Cheers,
> Marcos.
>
>
> On 04/17/2012 03:31 AM, isabelle.charon wrote:
>
>> Dear all,
>>
>> Thanks for the very useful tool NetcdfSubset. http://www.ncdc.noaa.gov/**
>> thredds/ncss/grid/gpcp_agg/**dataset.html<http://www.ncdc.noaa.gov/thredds/ncss/grid/gpcp_agg/dataset.html>
>> I try to use it to extract monthly mean GPCP precipitation, for years
>> from 1991 to 2010, in netcdf format.
>> I obtain a file which contains 624 time steps. I've expected 240: 12
>> months * 20 years. I think I obtain first the 240 time steps I've required
>> in the file, then the entire archive from 1979 to 2010 (384 time steps
>> more).
>> Can you explain me this think? Is it possible to extract only the 240
>> time steps?
>> Thank you very much.
>>
>> Isabelle Charon (Meteo-France, Frebch meteorology service)
>>
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>
>
