[netcdf-java] changing variable shape with NcML

To: netcdf-java@xxxxxxxxxxxxxxxx
Subject: [netcdf-java] changing variable shape with NcML
From: Doug Lindholm <doug.lindholm@xxxxxxxxxxxxxxxxx>
Date: Thu, 02 Apr 2009 15:57:03 -0600

I'm using relatively new version 4 NetCDF Java code.

I have an HDF5 file with a 1D array of data, but I secretly know that itrepresents a 2D array. I was hoping that I could simply get away withdefining a 2D shape for the variable in NcML:


<dimension name="time" length="149016" isUnlimited="true" />
<dimension name="vector_dimension" length="2" />

<variable name = "B" orgName="ExtendibleArray" shape="timevector_dimension" type="double">

I was getting away with it till I tried to subset the Variable withread(int[] origin, int[] shape). When it got to VariableDS._read(Sectionsection), the code delegated to the 1D "orgVar" with the 2D sectionwhich made it sad:


ucar.ma2.InvalidRangeException: Number of ranges in section (2) must be = 1
        at ucar.ma2.Section.fill(Section.java:143)
        at ucar.nc2.Variable.read(Variable.java:776)
        at ucar.nc2.dataset.VariableDS._read(VariableDS.java:496)
        at ucar.nc2.Variable.read(Variable.java:776)
        at ucar.nc2.Variable.read(Variable.java:722)

Was I just being overly optimistic in trying to change the shape/rankthis way? Any suggestions on how to get this as a 2D array via the NcMLReader?


Thanks,
Doug