## ON388 - TABLE 7
RESOLUTION AND COMPONENT FLAGS
(GDS Octet 17)

Revised 3/10/98

BIT | VALUE | MEANING
--- | --- | ---
1 | 0 | Direction increments not given
1 | Direction increments given
2 | 0 | Earth assumed spherical with radius = 6367.47 km
1 | Earth assumed oblate spheroid with size as determined by IAU in 1965: 6378.160 km, 6356.775 km, f = 1/297.0
3-4 | 0 | reserved (set to 0)
5 | 0 | u- and v-components of vector quantities resolved relative to easterly and northerly directions
1 | u and v components of vector quantities resolved relative to the defined grid in the direction of increasing x and y (or i and j) coordinates respectively
6-8 | 0 | reserved (set to 0)

Note:
If the GDS is not included in a message then any wind components are assumed to be resolved relative to the grid specified in the PDS with u and v defined as positive in the direction of increasing x and y (or i and j) coordinates respectively.

Office Note 388 - GRIB