Hi all,
I'm having problems working with NcML aggregations and the 2.2.16
version of the Java NetCDF libraries. I would like to aggregate
files:
NATL_1_28082006.nc
NATL_1_29082006.nc
NATL_1_30082006.nc
...
along the time dimension. I tried an NcML file like this:
<netcdf xmlns="http://www.unidata.ucar.edu/namespaces/netcdf/ncml-2.2";>
<aggregation dimName="time" type="joinNew">
<variableAgg name="temperature"/>
<variableAgg name="salinity"/>
<scan location="/path/to/files/" suffix=".nc"
dateFormatMark="NATL_1_#ddMMyyyy" />
</aggregation>
</netcdf>
This gave me a NullPointerException:
java.lang.NullPointerException
java.util.Calendar.setTime(Calendar.java:1032)
java.text.SimpleDateFormat.format(SimpleDateFormat.java:785)
java.text.SimpleDateFormat.format(SimpleDateFormat.java:778)
java.text.DateFormat.format(DateFormat.java:314)
ucar.nc2.units.DateFormatter.toDateTimeStringISO(DateFormatter.java:184)
ucar.nc2.ncml.Aggregation.crawlDirectory(Aggregation.java:817)
I think I know why this is. There are other files in the same
directory of the form "NATL_120_28082006.nc" and I think the
aggregator is trying to match these. Can I arrange it so that only
files that match the pattern "NATL_1_#ddMMyyyy.nc" are aggregated, and
all others are simply ignored?
I am reluctant to change the directory structure of my data because
other applications may depend on it.
Thanks in advance,
Jon
--
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Dr Jon Blower Tel: +44 118 378 5213 (direct line)
Technical Director Tel: +44 118 378 8741 (ESSC)
Reading e-Science Centre Fax: +44 118 378 6413
ESSC Email: jdb@xxxxxxxxxxxxxxxxxxxx
University of Reading
3 Earley Gate
Reading RG6 6AL, UK
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