GRIB API Manual
Author: $Author: Enrico Fucile $
Keywords: webgroup documents

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Latitude/longitude or equidistant cylindrical or plate carree grids
Element | Contents | GRIB API keys
--- | --- | ---
1 | Data representation type (see WMO code table 6) | gridType
2 | Number of points along a parallel (Ni). | Ni Nx
3 | Number of points along a meridian (Nj). | Nj Ny
4 | Latitude of the first grid point. | latitudeOfFirstGridPointInDegrees*1000
5 | Longitude of the first grid point. | longitudeOfFirstGridPointInDegrees*1000
6 |
    Resolution flag:
     0    Direction increments not given.
     128  Direction increments given.
| ijDirectionIncrementGiven*128
7 | Latitude of the last grid point. | latitudeOfLastGridPointInDegrees*1000
8 | Longitude of the last grid point. | longitudeOfLastGridPointInDegrees*1000
9 | i direction increment. | iDirectionIncrementInDegrees*1000
10 | j direction increment. | jDirectionIncrementInDegrees*1000
11 | Scanning mode flags (see WMO code table 8) | iScansNegatively jScansNegatively jPointsAreConsecutive
12 | Number of vertical coordinate parameters. | NV
13 | Latitude of the southern pole of rotation. | latitudeOfSouthernPoleInDegrees*1000
14 | Longitude of the southern pole of rotation. | longitudeOfSouthernPoleInDegrees*1000
15 | Latitude of the pole of stretching. | latitudeOfPoleOfStretchingInDegrees *1000
16 | Longitude of the pole of stretching. | longitudeOfPoleOfStretchingInDegrees *1000
17 |
    0  Regular grid.
    1  Quasi-regular (reduced) grid.
    At the moment, quasi-regular (reduced) latitude/longitude grids are
    not unambiguously defined. The resolution flag field indicates whether
    or not both direction increments are given; at least one must be given,
    as grids are only allowed to be irregular in one direction.
| gridType
18 |
    Earth flag:
     0   Earth assumed spherical with radius 6367.47 km.
     64  Earth assumed oblate spheroidal with size as determined by IAU in 1965:
           6378.160km,   6356.775km,   f=1/297.0
| earthIsOblate
19 |
    Components flag:
     0  Resolved u and v components of vector quantities relative to easterly
        and northerly directions.
     8  Resolved u and v components of vector quantities relative to the
        defined grid in the direction of increasing x and y (or i and j)
        coordinates respectively.
| uvRelativeToGrid
20-22 | Reserved. Set to 0. |
23-nn |
    For a quasi-regular (reduced) grid, the number of points along each parallel
    must be defined. The number of parallels is given by Nj above.
    Alternatively, this may be the number of pointqs along each meridian, where
    the number of meridians is given by Ni above.q
| pl

| 22.10.2010-->

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