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

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Gaussian grids
Element | Contents | GRIB API keys
--- | --- | ---
1 | Data representation type (see WMO code table 6) | gridType
2 | Number of points along a parallel. Cannot be used for quasi-regular (reduced) grids. | 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. Cannot be used for quasi-regular (reduced) grids. | iDirectionIncrementInDegrees*1000
10 | Number of parallels between a pole and the Equator,ie the gaussian grid number. | numberOfParallelsBetweenAPoleAndTheEquator
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.
| 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; or not used.
     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, NN the number of points along a full parallel (360 degrees) is defined for each latitude row in the area. The number of parallels is given by Nj above. | pl

| 22.10.2010-->-->

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