GRIB2 Meta Data and grib_api Keys for Section 6: Bit Map Section

Last updated: January 2013

The following table lists the GRIB2 meta data and associated grib_api keys for the Bit Map Section of GRIB2 messages.


Octets Key Name Comments
1-4 section6Length Length of section in octets (nn)
5 numberOfSection Number of section (6)
6 bitMapIndicator Bit-map indicator according to Code Table 6.0
0A bit map applies to this product and is specified in this Section
1-253A bit map pre-determined by the originating/generating Centre applies to this product and is not specified in this Section
254A bit map defined previously in the same "GRIB" message applies to this product.
255A bit map does not apply to this product
7-nn Bit-map: Contiguous bits with a bit to data point correspondence, ordered as defined in Section 3. A bit set equal to 1 implies the presence of a data value at the corresponding data point, whereas a value of 0 implies the absence of such a value.


Note: If octet 6 is not zero, the length of the Section is 6 and octets 7-nn are not present.

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