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Re: decoders] Bufr Decode Exception

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  • Subject: Re: decoders] Bufr Decode Exception
  • Date: Mon, 17 Mar 2008 16:12:02 -0600 (MDT)
On Thu, 13 Mar 2008, Tatsuya Noyori wrote:


Hello,

I am tring to decode a bufr file and have had a Exception. The
exception is as follows:

     D:\netcdfAll-2.2.22>java -Xmx256m ucar.bufr.BufrIndexer
ISSM41_RJTD_120000_KAA.bin  >ISSM41_RJTD_120000_KAA.bin.indexer.txt
     Exception in thread "main" java.lang.NullPointerException
             at ucar.bufr.BufrIndexer.writeFileIndex(BufrIndexer.java:327)
             at ucar.bufr.BufrIndexer.main(BufrIndexer.java:494)

And the index file that BufrIndexer outputs is as follows:

     D:\netcdfAll-2.2.22> cat ISSM41_RJTD_120000_KAA.bin.indexer.txt
     Unknown DDS DataType =48
     type = BUFR
     bufr_edition = 3
     location = ISSM41_RJTD_120000_KAA.bin
     length = 7441
     created = 2008-03-13T04:45:34Z
     index_version = 1.1
     --------------------------------------------------------------------

It seems like a bug. if so, I would appreciate it if unidata team
would fix the bug.



Tatsuya,

Not a bug...


the DataType=48  in the file is wrong, it can only be values 0,64,128,196:

BUFR Documentation:
Bit 1 = 1 observed data = 0 other data
Bit 2 = 1 compressed data = 0 non-compressed data
Bit 3 - 8 set to zero (reserved)

I even remove 3-8 bit values that resulted in DataType =0 but then
the descriptors were outside the range ie 0-48-50, in table 12 the
highest 0 descriptor is 0-35-

Contact the data provider for more information.



      if( dds.getDataType() == 192 || dds.getDataType() == 64 ) {
         isCompressed = true;
         compressed();
      } else if( dds.getDataType() == 128 || dds.getDataType() == 0 ) {
         isCompressed = false;
         uncompressed();
      } else {
System.out.println( "Unknown DDS DataType ="+ dds.getDataType() ); 
         return false;

Robb...



And I am attaching the bufr file that I tried to decode.

Best regards,

--
Tatsuya Noyori (^o^)/



===============================================================================
Robb Kambic                                Unidata Program Center
Software Engineer III                      Univ. Corp for Atmospheric Research
address@hidden             WWW: http://www.unidata.ucar.edu/
===============================================================================