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NOTICE: This version of the NSF Unidata web site (archive.unidata.ucar.edu) is no longer being updated.
Current content can be found at unidata.ucar.edu.
To learn about what's going on, see About the Archive Site.
Benno, On Thu, Dec 30, 2010 at 2:46 PM, Benno Blumenthal <benno@xxxxxxxxxxxxxxxx> wrote: > FYI - that data is already served aggregated at pcmdi Where? > one of the mistakes > that one needs to watch for is time coordinates (particularly time bounds) > where the units are different between the three files, e.g. each file starts > at time zero but that value has a different offset in the units. This case can be handled in NcML by adding timeUnitsChange="true" to the aggregation specification: <aggregation dimName="time" type="joinExisting" timeUnitsChange="true"> -Rich > > On Dec 28, 2010 9:33 AM, <tnb@xxxxxxxxxxxxxxxx> wrote: > > Hi everybode! > > I would like to make a local server for some IPCC data and would like to > know if is there any way to aggregate (type "union") virtual data (construct > with aggregate "joinExisting") with netcdf files. > > Let me explain with an example: > > I have 3 variables, all monthly data, sea surface temperature, salinity and > sea surface height, each one in a diferent directory. > > SST are 3 files, sst_1970_1980.nc, sst_1980_1990.nc, sst_1990_2000.nc > > salinity are 3 files too, sal_1970_1980.nc, sal_1980_1990.nc, > sal_1990_2000.nc > > SSH is 1 file, ssh_1970_2000.nc > > Each variable have the same lon, lat axis and in total, all have 30 X 12 = > 360 timesteps. > > I tried to do a nested aggregation, but it doesn t work... > > > <dataset name="IPCC data" ID="ippc_agg" urlPath="ipcc/agg.nc"> > <serviceName>odap</serviceName> > <netcdf xmlns="http://www.unidata.ucar.edu/namespaces/netcdf/ncml-2.2";> > <aggregation dimName="time" type="joinExisting"> > <netcdf> > <aggregation type="union"> > <netcdf location="/data/IPCC/20c3m/ocn/mo/thetao/sst_1970_1980.nc"/> > <netcdf location="/data/IPCC/20c3m/ocn/mo/so/sal_1970_1980.nc"/> > </aggregation> > </netcdf> > <netcdf> > <aggregation type="union"> > <netcdf location="/data/IPCC/20c3m/ocn/mo/thetao/sst_1980_1990.nc"/> > <netcdf location="/data/IPCC/20c3m/ocn/mo/so/sal_1980_1990.nc"/> > </aggregation> > </netcdf> > <netcdf> > <aggregation type="union"> > <netcdf location="/data/IPCC/20c3m/ocn/mo/thetao/sst_1990_2000.nc"/> > <netcdf location="/data/IPCC/20c3m/ocn/mo/so/sal_1990_2000.nc"/> > </aggregation> > </netcdf> > <netcdf> > <aggregation type="union"> > <netcdf location="/data/IPCC/20c3m/ocn/mo/zos/ssh_1970_2000.nc"/> > </aggregation> > </netcdf> > </aggregation> > </netcdf> > </dataset> > > > ... I expected that the aggregate data, agg.nc had 3 vars, sst, sal and ssh > and each one with a 360 timesteps axis. But what happens was that agg.nc > have only 2 vars, sst and sal and their time axis have 720 timesteps. > > I didn t find any information about how to do this kind of aggregation and > stay wondering how could it be done. > > Thanks for attention and happy new year for all! > > Tiago Bomventi > > > > _______________________________________________ > thredds mailing list > thredds@xxxxxxxxxxxxxxxx > For list information or to unsubscribe, visit: > http://www.unidata.ucar.edu/mailing_lists/ > > _______________________________________________ > thredds mailing list > thredds@xxxxxxxxxxxxxxxx > For list information or to unsubscribe, visit: > http://www.unidata.ucar.edu/mailing_lists/ > -- Dr. Richard P. Signell (508) 457-2229 USGS, 384 Woods Hole Rd. Woods Hole, MA 02543-1598
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