Code Form

Section 0 - Indicator section
Section 1 - Product definition section
Section 2 - Grid description section
Section 3 - Bit-map section
Section 4 - Binary data section
Section 5 - End section


NOTES:


1. GRIB is the name of the binary code for the exchange for processed data.
   
   
2. The GRIB coded analysis or forecast consists of a continuous bit-stream made of a sequence of octets (1 octet=8 bits).
   
   
3. The octets of a GRIB message are grouped in sections:
   

   Section number	Name	Contents
   0	Indicator section	"GRIB", length of message, GRIB edition number
   1	Product definition section	Length of section, identification of the coded anlysis or forecast
   2	Grid description section (optional)	Length of section, grid geometry, as necessary
   3	Bit-map section	Length of section; the bit per grid point, placed in suitable sequence, indicates omission (bit 0) or inclusion (bit 1) of data at respective points
   4	Binary data section	Length of section and data values
   5	End section	7777

   
   
   
4. Although the Grid description section is indicated as optional, it is strongly urged that it be included in all GRIB messages.
   
   
5. It will be noted that the GRIB code is not suitable for visual data recognition without computer interpretation.
   
   
6. The representation of data by means of series of bits is independent of any particular machine representation.
   
   
7. Message and section lengths are expressed in octets. Section 0 has a fixed length of 8 octets; Section 5 has a fixed length of 4 octets. Sections 1, 2, 3, and 4 have a variable length which is included in the first three octets of each section.



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