grib_filter

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Introduction grib_filter • Access data inside a message through keys. • Print contents of a message. • Set values inside a message. • Use control structures (if,switch). • Write a message to disk. Slide 4 COM GRIB API, ECMWF 26-Feb, 01-Mar 2013 ©ECMWF Slide 4
Usage grib_filter grib_filter rules_file [-o out_file] in_file1 in_file2 … • Each field from the input files is processed and the rules contained in the rules_file are applied to it. • A grib message is written to an output file only if a write instruction is applied to it. • Each instruction in the rules_file must end with a semicolon “;”. • Syntax errors in the rules_file are reported with their line number. Slide 5 COM GRIB API, ECMWF 26-Feb, 01-Mar 2013 ©ECMWF Slide 5
Page 1 and 2: grib_filter GRIB API: grib_filter X
Page 3: Introduction grib_filter • GRIB A
Page 7 and 8: Example 1 grib_filter # A simple pr
Page 9 and 10: Example 3 grib_filter # three colum
Page 11 and 12: Example 4 grib_filter # Creating mu
Page 13 and 14: Example 5 grib_filter append; > gri
Page 15 and 16: Example 6 grib_filter set edition =
Page 17 and 18: Rules syntax grib_filter • transi
Page 19 and 20: Practicals grib_filter To get the m
Page 21 and 22: Example 9 grib_filter File rule.fil
Page 23 and 24: Example 10 grib_filter print "proce
Page 25 and 26: Practicals grib_filter 1. Change th
Page 27: grib_filter Questions ? Slide 27 CO

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