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NOTICE: This version of the NSF Unidata web site (archive.unidata.ucar.edu) is no longer being updated.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.
We use the Thredds catalog to produce http://iridl.ldeo.columbia.edu/SOURCES/.WCRP/.CMIP3/ and that page has a number of useful links. The original Thredds catalog is at http://esgcet.llnl.gov/dap/ipcc4/?thredds We occasionally find a problem, and a fair number of the time bounds have some single precision noise that appeared in the conversion process, but there is a lot of useful data there. Both our service and the original use the same user/password that you get in the first place to access the data, i.e. IRI does not issue the password. Benno On Thu, Dec 30, 2010 at 3:28 PM, Rich Signell <rsignell@xxxxxxxx> wrote: > 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 > -- Dr. M. Benno Blumenthal benno@xxxxxxxxxxxxxxxx International Research Institute for climate and society The Earth Institute at Columbia University Lamont Campus, Palisades NY 10964-8000 (845) 680-4450
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