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NOTICE: This version of the NSF Unidata web site (archive.unidata.ucar.edu) is no longer being updated.
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Hello- I was about to ask the same question.To expand on your problem, when aggregating 8 files, I encounter the error only when accessing the last file. That is, an ncdump in time of 0:6:1 has no error, but 0:7:1 causes the error. Thinking the eighth file was the problem, I removed it and got the error when accessing the last file again. It appears that there is some problem when trying to access the last file in the aggregation? Funny thing is the last file is being read properly (at least in part) because the time variable is properly assigned by grabbing it from all 8 files, but any of the other variables from the 8th file causes problems.
-Ken Knapp NCML file: <netcdf xmlns="http://www.unidata.ucar.edu/namespaces/netcdf/ncml-2.2";> <aggregation dimName="time" type="joinExisting"> <scan location="/home/kknapp/java/data/" suffix=".GPC"/> </aggregation> </netcdf> Jon Blower wrote:
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
-- Ken Knapp, Ph.D. Ken.Knapp@xxxxxxxx Remote Sensing and Applications Division National Climatic Data Center 151 Patton Ave Asheville, NC 28801-5001 828-271-4339 (voice) 828-271-4328 (fax) ============================================================================== To unsubscribe netcdf-java, visit: http://www.unidata.ucar.edu/mailing-list-delete-form.html ==============================================================================
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