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1. The bufr_filter processes sequentially all bufr messages contained in the input files and applies the rules to each one of them. Input messages can be written to the output by using the "write" statement. The write statement can be parameterised so that output is sent to multiple files depending on key values used in the output file name.




2. Header information can be accessed witout unpacking the data. This rules_file: To print header information only (all BUFR messages must have it)

   Code Block
   print "[bufrHeaderCentre] [bufrHeaderSubCentre] [masterTablesVersionNumber] [localTablesVersionNumber] [numberOfSubsets]";

   will result in the the follwing output:

   Code Block
   > bufr_filter rules_file ../data/bufr/syno_multi.bufr 98 0 13 1 1 98 0 13 1 1 98 0 13 1 1




3. To print values from the data section the messages has have to be unpacked. This rules_file: \

   Code Block
   set unpack=1; print "block=[blockNumber] station=[stationNumber] lat=[latitude] lon=[longitude] t2=[airTemperatureAt2M]";

   will print out some data values from the specified SYNOP BUFR messages.

   Code Block
   > bufr_filter rules_file ../data/bufr/syno_multi.bufr block=1 station=1 lat=70.93 lon=-8.67 t2=274.5 block=1 station=3 lat=77 lon=15.5 t2=268.4 block=1 station=7 lat=78.92 lon=11.93 t2=268.5