WMO Code table 11 - Binary data section flag



Bit No.	Value	Meaning
1	0	Grid-point data
	1	Spherical harmonic coefficients
2	0	Simple packing
	1	Complex or second-order packing
3	0	Floating point values (in the original data) are represented
	1	Integer values (in the original data) are represented
4	0	No additional flags at octet 14
	1	Octet 14 contains additional flag bits
The following gives the meaning of the bits in octet 14 ONLY if bit 4 is set to 1. Otherwise octet 14 contains regular binary data.
Bit No.	Value	Meaning
5		Reserved - set to zero
6	0	Single datum at each grid point
	1	Matrix of values at each grid point
7	0	Second-order values constant width
	1	Second-order values different widths
9-12		Reserved for future use





NOTES:


1. Bit 4 shall be set to 1 to indicate that bits 5 to 12 are contained in octet 14 of the Binary data section.
   
   
2. Bit 3 shall be set to 1 to indicate that the data represented are integer values; where integer values are represented, any reference values, if not zero, should be rounded to integer before applied.
   
   
3. Where secondary bit-maps are present in the data (used in association with second-order packing and, optionally, with a matrix of values at each point), this shall be indicated by setting bit 7 to 1.
   
   
4. The indicated meaning of bit 6 shall be retained in anticipation of the future reintroduction of a system to define a matrix of values at each grid point.



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