Re: [netcdf-java] Error reading JGOFS data via OPenDAP using NetCDF-Java

• To: Brian Schlining <bschlining@xxxxxxxxx>
• Subject: Re: [netcdf-java] Error reading JGOFS data via OPenDAP using NetCDF-Java
• From: John Caron <caron@xxxxxxxxxxxxxxxx>
• Date: Tue, 24 Nov 2009 15:48:08 -0700

Hi Brian:

This server is an older one:

DODS server core software: DODS DAP++/3.4.8
Server version: jg-dods/3.4.3

http://usjgofs.whoi.edu/dods-bin/nph-dods/jgofs/merged_objects/US_JGOFS/Equatorial_Pacific/bottle_eqpac?Level_0

Host: usjgofs.whoi.edu

Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-us,en;q=0.5
Accept-Encoding: gzip,deflate
Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7
Keep-Alive: 300
Connection: keep-alive
If-Modified-Since: Tue Nov 24 22:42:17 2009 GMT

HTTP/1.x 200 OK
XDODS-Server: /DAP/3.8.0
Date: Tue Nov 24 22:42:28 2009 GMT
Last-Modified: Tue Nov 24 22:42:28 2009 GMT
Content-Type: text/plain
Content-Description: dods_error
Cache-Control: no-cache
----------------------------------------------------------

    foram = v.findVariable('foram');
    data = foram.read();

isnt quite right, but i cant test until we see whats up with the server.

Brian Schlining wrote:

Hi All,

I'm trying to access JGOFS bottle data using NetCDF-Java. The JGOFS data is being served via OPeNDAP at the URL: http://usjgofs.whoi.edu/dods-bin/nph-dods/jgofs/merged_objects/US_JGOFS/Equatorial_Pacific/bottle_eqpac. The DDL can be viewed at http://usjgofs.whoi.edu/dods-bin/nph-dods/jgofs/merged_objects/US_JGOFS/Equatorial_Pacific/bottle_eqpac

Here's the issue:

---- I'm actually using the NetCDF-Java inside of Matlab (see http://code.google.com/p/nctoolbox/). The versions of the Java jars are:

    netcdf-4.0
    opendap-2.1

---- Here's the steps I'm taking in Matlab. (It looks like Java pseudo-code) : url = 'http://usjgofs.whoi.edu/dods-bin/nph-dods/jgofs/merged_objects/US_JGOFS/Equatorial_Pacific/bottle_eqpac'

    netcdf = ucar.nc2.dataset.NetcdfDataset.openDataset(url);
     vars = netcdf.getVariables();
     v = vars.get(0);
     foram = v.findVariable('foram');
     data = foram.read();

When I make the call to 'read()' the following Exception is thrown:

opendap.dap.DAP2Exception: "Could not open bottle_eqpac(Level_0): l_jdbopen, &x Bad Name: Level_0: "

at opendap.dap.DConnect2.openConnection(DConnect2.java:233)
at opendap.dap.DConnect2.getData(DConnect2.java:699)
at opendap.dap.DConnect2.getData(DConnect2.java:979)

at ucar.nc2.dods.DODSNetcdfFile.readDataDDSfromServer(DODSNetcdfFile.java:1125)

at ucar.nc2.dods.DODSNetcdfFile.readData(DODSNetcdfFile.java:1289)
at ucar.nc2.Variable._read(Variable.java:927)
at ucar.nc2.Variable.read(Variable.java:791)
at ucar.nc2.Variable._read(Variable.java:914)
at ucar.nc2.Variable.read(Variable.java:791)
at ucar.nc2.dataset.VariableDS._read(VariableDS.java:469)
at ucar.nc2.Variable.read(Variable.java:791)
??? Java exception occurred:

java.io.IOException: "Could not open bottle_eqpac(Level_0): l_jdbopen, &x Bad Name:

Level_0: "
at ucar.nc2.dods.DODSNetcdfFile.readData(DODSNetcdfFile.java:1296)
at ucar.nc2.Variable._read(Variable.java:927)
at ucar.nc2.Variable.read(Variable.java:791)
at ucar.nc2.Variable._read(Variable.java:914)
at ucar.nc2.Variable.read(Variable.java:791)
at ucar.nc2.dataset.VariableDS._read(VariableDS.java:469)
at ucar.nc2.Variable.read(Variable.java:791)

Note: This happens both inside of Matlab and in just plain Java. Am I accessing the JGOFS data structure correctly? Any help is appreciated!!

Thanks

-- B ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~

Brian Schlining
bschlining@xxxxxxxxx <mailto:bschlining@xxxxxxxxx>
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• References:
  • [netcdf-java] Error reading JGOFS data via OPenDAP using NetCDF-Java
    • From: Brian Schlining