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
