Bug found in setting dimension for empty data category

[emilyhcliu]

Test case ATMS bufr (two dimensions data: Location, Channel)

• contains 3 categories: npp, n20 and n21
• ATMS bufr does not contain n21, so the output netCDF contains zero location and 22 channels.

Running bufr2netcdf test for ATMS with two versions of bufr-query using the same atms mapping file:

• develop (after the encoder enhancement PR merged)
• commit 8bc2886 (before the encoder enhancement PR merged)

The channel dimension is not set correctly (dim_2=22) in the output NetCDF from develop (check the first block below)

The channel dimension is set correctly (dimension=22) in the output NetCDF from commit 8bc2886 (check the second block below)

The output NetCDF hearer for atms_n21 from develop version:

netcdf gdas.t00z.atms_n21.tm00 {
dimensions:
        Location = UNLIMITED ; // (0 currently)
        dim_2 = 22 ;
variables:
        int Location(Location) ;
                Location:_FillValue = 2147483647 ;
        int dim_2(dim_2) ;
                dim_2:_FillValue = 2147483647 ;

// global attributes:
                :platformCommonName = "JPSS" ;
                :platformLongDescription = "Joint Polar Satellite System" ;
                :sensor = "Advanced Baseline Imager (ATMS)" ;
                :source = "NCEP BUFR Dump for ATMS brightness temperature data (atms normal feed)" ;
                :providerFullName = "National Environmental Satellite, Data, and Information Service" ;
                :processingLevel = "Level-1B" ;
                :converter = "BUFR" ;
data:

 dim_2 = 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 ;

The output NETCDF header from atms_n21 from commit 8bc2886 :

netcdf gdas.t00z.atms_n21.tm00 {
dimensions:
        Channel = 22 ;
        Location = UNLIMITED ; // (0 currently)
variables:
        int Channel(Channel) ;
                Channel:_FillValue = 2147483647 ;
        int Location(Location) ;
                Location:_FillValue = 2147483647 ;

// global attributes:
                :platformCommonName = "JPSS" ;
                :platformLongDescription = "Joint Polar Satellite System" ;
                :sensor = "Advanced Baseline Imager (ATMS)" ;
                :source = "NCEP BUFR Dump for ATMS brightness temperature data (atms normal feed)" ;
                :providerFullName = "National Environmental Satellite, Data, and Information Service" ;
                :processingLevel = "Level-1B" ;
                :converter = "BUFR" ;
data:

 Channel = 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 ;