[netcdf-java] Documentation or Direction on defining dimensions of variables in DODSNetcdfFile

• To: "netcdf-java@xxxxxxxxxxxxxxxx" <netcdf-java@xxxxxxxxxxxxxxxx>
• Subject: [netcdf-java] Documentation or Direction on defining dimensions of variables in DODSNetcdfFile
• From: Jake Sheck <Jake.Sheck@xxxxxxxxxxxxxx>
• Date: Thu, 20 Oct 2011 22:17:55 -0500

UCAR NetCDF mail group,

I am working on acquiring small amounts of GFS, NAM and RUC data from 
nomads.ncdc.noaa.gov.  As a test I am trying to collect the Temperature 
variable for a particular point.  I can easily acquire this data via my web 
browser with this link.  
http://nomads.ncdc.noaa.gov/thredds/dodsC/ruc13/201110/20111018/ruc2_130_20111018_1300_000.grb2.asc?Temperature[0][2][100][300]

I would like to collect this variable via the netcdf java library.  However I 
can't seem to find documentation on the correct use of the dimensions variables 
in the readSection or readArrays methods of the DODSNetcdfFile.  Could anyone 
please direct me to documentation for these?  I have found that even when I 
specifiy dimenions for a variable it still downloads the complete grid and 
takes much longer than the link above.

Here is an example of what I am trying to do.

String modelFile = 
"http://nomads.ncdc.noaa.gov/thredds/dodsC/ruc13/201110/20111018/ruc2_130_20111018_1300_000.grb2";;
DODSNetcdfFile ncfile = new DODSNetcdfFile( modelFile );

Dimension time = new Dimension("time", 1);
                Dimension pressure = new Dimension("pressure",1);
                Dimension xd = new Dimension("x", 126);
                Dimension yd = new Dimension("y", 557);

                List<Dimension> ds = new ArrayList<Dimension>();
                ds.add(time);
                ds.add(pressure);
                ds.add(xd);
                ds.add(yd);

for(Variable v : ncfile.getVariables()){
      if(v.getName.equals("Temperature_height_above_ground"))
             preloadVariables.add(v);
}


List<Array> arrays = ncfile.readArrays( preloadVariables );

Here I get the variable for temperature, but I get the whole set, and not a set 
limited by the dimensions that I set.

Thanks
Jacob Sheck


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• Follow-Ups:
  • Re: [netcdf-java] Documentation or Direction on defining dimensions of variables in DODSNetcdfFile
    • From: John Caron
  • Re: [netcdf-java] Documentation or Direction on defining dimensions of variables in DODSNetcdfFile
    • From: Ethan Davis