[netCdfJava #WCC-197892]: New problem with Grib12Netcdf

• To: robb@xxxxxxxxxxxxxxxx
• Subject: [netCdfJava #WCC-197892]: New problem with Grib12Netcdf
• From: "Unidata netCDF Java Support" <support-netcdf-java@xxxxxxxxxxxxxxxx>
• Date: Thu, 14 Sep 2006 12:30:04 -0600

Hi Julian:

Because this file has more than one GDS, they get placed into seperate groups:

netcdf C:/data/test/INDOuestN_20652.grb {

 Group proj0 {
   dimensions:
     time = 7;   // (has coord.var)  
     lat = 31;   // (has coord.var)  
     lon = 21;   // (has coord.var)  
     height_above_ground = 1;   // (has coord.var)  
   variables:
     float u_wind(time=7, height_above_ground=1, lat=31, lon=21);
       :units = "m/s";
       :long_name = "u wind @ height_above_ground";
       :missing_value = -9999.0f; // float
       :GRIB_param_name = "u wind";
       :GRIB_center_id = 98; // int
       :GRIB_table_id = 2; // int
       :GRIB_param_number = 33; // int
       :GRIB_param_id = 1, 98, 2, 33; // int
       :GRIB_product_definition_type = "Forecast/Uninitialized Analysis/Image 
Product";
       :GRIB_level_type = 105; // int
     float v_wind(time=7, height_above_ground=1, lat=31, lon=21);
       :units = "m/s";
       :long_name = "v wind @ height_above_ground";
       :missing_value = -9999.0f; // float
       :GRIB_param_name = "v wind";
       :GRIB_center_id = 98; // int
       :GRIB_table_id = 2; // int
       :GRIB_param_number = 34; // int
       :GRIB_param_id = 1, 98, 2, 34; // int
       :GRIB_product_definition_type = "Forecast/Uninitialized Analysis/Image 
Product";
       :GRIB_level_type = 105; // int
     char latLonCoordSys;
       :_CoordinateAxes = "time lat lon";
     int time(time=7);
       :long_name = "forecast time";
       :units = "hour since 2006-07-17T12:00:00Z";
       :GRIB_orgReferenceTime = "2006-07-17T12:00:00Z";
       :GRIB2_significanceOfRTName = "Start of forecast";
       :_CoordinateAxisType = "Time";
     double lat(lat=31);
       :units = "degrees_north";
       :long_name = "latitude coordinate";
       :standard_name = "latitude";
       :grid_spacing = "-2.0 degrees_north";
       :_CoordinateAxisType = "Lat";
     double lon(lon=21);
       :units = "degrees_east";
       :long_name = "longitude coordinate";
       :standard_name = "longitude";
       :grid_spacing = "2.0 degrees_east";
       :_CoordinateAxisType = "Lon";
     double height_above_ground(height_above_ground=1);
       :long_name = "Specified height level above ground";
       :units = "m";
       :positive = "up";
       :GRIB_level_type = "105";
       :_CoordinateAxisType = "Height";
       :_CoordinateZisPositive = "up";
 }

 Group proj1 {
   dimensions:
     time = 7;   // (has coord.var)  
     lat = 21;   // (has coord.var)  
     lon = 21;   // (has coord.var)  
     height_above_ground = 1;   // (has coord.var)  
   variables:
     float Pressure_reduced_to_MSL(time=7, lat=21, lon=21);
       :units = "Pa";
       :long_name = "Pressure reduced to MSL @ msl";
       :missing_value = -9999.0f; // float
       :GRIB_param_name = "Pressure reduced to MSL";
       :GRIB_center_id = 98; // int
       :GRIB_table_id = 2; // int
       :GRIB_param_number = 2; // int
       :GRIB_param_id = 1, 98, 2, 2; // int
       :GRIB_product_definition_type = "Forecast/Uninitialized Analysis/Image 
Product";
       :GRIB_level_type = 102; // int
     float Sig_height_of_wind_waves_and_swell(time=7, lat=21, lon=21);
       :units = "m";
       :long_name = "Sig height of wind waves and swell @ msl";
       :missing_value = -9999.0f; // float
       :GRIB_param_name = "Sig height of wind waves and swell";
       :GRIB_center_id = 98; // int
       :GRIB_table_id = 2; // int
       :GRIB_param_number = 100; // int
       :GRIB_param_id = 1, 98, 2, 100; // int
       :GRIB_product_definition_type = "Forecast/Uninitialized Analysis/Image 
Product";
       :GRIB_level_type = 102; // int
     char latLonCoordSys;
       :_CoordinateAxes = "time lat lon";
     int time(time=7);
       :long_name = "forecast time";
       :units = "hour since 2006-07-17T12:00:00Z";
       :GRIB_orgReferenceTime = "2006-07-17T12:00:00Z";
       :GRIB2_significanceOfRTName = "Start of forecast";
       :_CoordinateAxisType = "Time";
     double lat(lat=21);
       :units = "degrees_north";
       :long_name = "latitude coordinate";
       :standard_name = "latitude";
       :grid_spacing = "-2.0 degrees_north";
       :_CoordinateAxisType = "Lat";
     double lon(lon=21);
       :units = "degrees_east";
       :long_name = "longitude coordinate";
       :standard_name = "longitude";
       :grid_spacing = "2.0 degrees_east";
       :_CoordinateAxisType = "Lon";
     double height_above_ground(height_above_ground=1);
       :long_name = "Specified height level above ground";
       :units = "m";
       :positive = "up";
       :GRIB_level_type = "105";
       :_CoordinateAxisType = "Height";
       :_CoordinateZisPositive = "up";
 }

 :Conventions = "CF-1.0";
 :Originating_center = "ECMWF, RSMC subcenter = 0";
 :Generating_Process_or_Model = "Lake Ice Forecast Model";
 :Product_Type = "Forecast/Uninitialized Analysis/Image Product";
 :cdm_data_type = "Grid";
 :creator_name = "ECMWF, RSMC subcenter = 0";
 :file_format = "GRIB-1";
 :location = "C:/data/test/INDOuestN_20652.grb";
 :history = "Direct read of GRIB into NetCDF-Java 2.2 API";
 :_CoordinateModelRunDate = "2006-07-17T12:00:00Z";
}

You can see this by usung the ToolsUI program.

These cannot be written into a netcdf-3 file, which doesnt support groups. We 
could probably add an option to flatten groups so that they can be written to 
netcdf-3, but its not available at this point.

We will respond separately about the table problem.



Ticket Details
==================
Ticket ID: WCC-197892
Department: Support netCDF Java
Priority: Normal
Status: Open