Re: [netcdf-java] problem recognising variable

• To: Adit Santokhee <ads@xxxxxxxxxxxxxxxxxxxx>
• Subject: Re: [netcdf-java] problem recognising variable
• From: John Caron <caron@xxxxxxxxxxxxxxxx>
• Date: Tue, 11 Aug 2009 10:48:18 -0600

Hi Adit:

Can you send me a sample file or an opendap URL?

Adit Santokhee wrote:

Hi,

We recently upgraded ncWMS to add new functionality and for that we are using the java netcdf-4.0.48.4 library. However, we are now having difficulty displaying "wind stress" variable from a certain dataset; the library thinks that it's a vertical axis with units of pressure. Previously, we didn't have this problem with netcdf-4.0.

Following is a brief ncdump of the dataset using ToolsUI (version 4.0.48.5.2) :

dimensions:
  x = 1442;
  y = 1021;
  deptht = 1;
  time_counter = UNLIMITED;   // (1 currently)
variables:
  float nav_lon(y=1021, x=1442);
    :units = "degrees_east";
    :valid_min = -180.0f; // float
    :valid_max = 180.0f; // float
    :long_name = "Longitude";
    :nav_model = "Default grid";
    :_CoordinateAxisType = "Lon";
  float nav_lat(y=1021, x=1442);
    :units = "degrees_north";
    :valid_min = -77.010475f; // float
    :valid_max = 89.94787f; // float
    :long_name = "Latitude";
    :nav_model = "Default grid";
    :_CoordinateAxisType = "Lat";
  float deptht(deptht=1);
    :units = "m";
    :positive = "unknown";
    :valid_min = 0.0f; // float
    :valid_max = 0.0f; // float
    :title = "deptht";
    :long_name = "Vertical T levels";
    :_CoordinateAxisType = "Height";
    :_CoordinateZisPositive = "unknown";
  float time_counter(time_counter=1);
    :calendar = "gregorian";
    :title = "Time";
    :long_name = "Time axis";
  float iocestru(time_counter=1, y=1021, x=1442);
    :units = "Pa";
    :missing_value = 0.0f; // float
    :valid_min = -50.0f; // float
    :valid_max = 50.0f; // float
    :long_name = "Wind stress u";
    :short_name = "iocestru";
    :online_operation = "N/A";
    :axis = "TYX";
    :interval_operation = 432000.0f; // float
    :interval_write = 432000.0f; // float
    :associate = "time_counter deptht nav_lat nav_lon";
    :_CoordinateAxisType = "Pressure";

:Conventions = "GDT 1.3";

:file_name = "/data/perseus/users/dab/WORK/Exp4/ORCA025/ORCA025-R07-S/2007/ORCA025-R07_y2007m03d01_icemod.nc";

:production = "OPA9.0 beta";
:TimeStamp = "2008-OCT-15 10:29:42 GMT+0100";
}

If I change the units to something other than Pa, then the variable is correctly recognised as a variable. Any suggestion will be much appreciated.

Cheers,
Adit


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• References:
  • [netcdf-java] problem recognising variable
    • From: Adit Santokhee