Re: [netcdf-java] problems decoding a grib filem grib parameter 189

• To: Bill Moninger <William.R.Moninger@xxxxxxxx>
• Subject: Re: [netcdf-java] problems decoding a grib filem grib parameter 189
• From: John Caron <caron@xxxxxxxxxxxxxxxx>
• Date: Tue, 17 Feb 2009 15:06:12 -0700

Hi Bill:

An "Unknown" param name is always due to us not having that parameter in our 
external grib tables.

Anyone seeing this problem can send us a sample file, which will help us track 
it down.

thanks.

Bill Moninger wrote:
> I'm using netCDF4-java to read grib1 files.
> 
> In one case, a typical RUC file has temperature data in the form VPT
> (virtual potential temperature). wgrib can read the file fine, and gives
> record indicators like this.
> 
> 101:29361886:d=09021719:VPTMP:kpds5=189:kpds6=109:kpds7=1:TR=0:P1=9:P2=0:TimeU=1:hybrid
> lev 1:9hr fcst:NAve=0
> 
> However, netcdf4-java fails, giving the variable name as 'Unknown', and
> apparently filling all the variables with 0.
> 
> Here's some relevant output from ncfile.toString():
> 
>   float Unknown(time=1, hybrid=50, y=337, x=451);
>      :units = "Unknown";
>      :long_name = "Unknown @ hybrid";
>      :missing_value = -9999.0f; // float
>      :grid_mapping = "Lambert_Conformal";
>      :GRIB_param_name = "Unknown";
>      :GRIB_center_id = 59; // int
>      :GRIB_table_id = 2; // int
>      :GRIB_param_number = 189; // int
>      :GRIB_param_id = 1, 59, 2, 189; // int
>      :GRIB_product_definition_type = "Forecast/Uninitialized
> Analysis/Image Product";
>      :GRIB_level_type = 109; // int
> 
> Any thoughts on how to solve this problem?
> 
> -Bill

• References:
  • [netcdf-java] problems decoding a grib filem grib parameter 189
    • From: Bill Moninger