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

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Mercator
Element | Contents | GRIB API keys
--- | --- | ---
1 | Data representation type (see WMO code table 6); 1 for Mercator | gridType
2 | Number of points along a parallel. | Ni Nx
3 | Number of points along a meridian. | 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 are not given.
     128      Direction increments are given.
| ijDirectionIncrementGiven*128
7 | Latitude of the last grid point. | latitudeOfLastGridPointInDegrees*1000
8 | Longitude of the last grid point. | longitudeOfLastGridPointInDegrees*1000
9 | Latitude at which the Mercator projection cylinder intersects the Earth(Latin). | latitudeAtWhichTheMercatorProjectionCylinderIntersectsTheEarthInDegrees*1000
10 | Reserved. Set to 0. |
11 | Scanning mode flags (see WMO code table 8) | iScansNegatively jScansNegatively jPointsAreConsecutive
12 | Number of vertical coordinate parameters. | NV
13 | i direction grid length. | longitudinalDirectionGridLength
14 | j direction grid length. | latitudinalDirectionGridLength
15-16 | Reserved. Set to 0. |
17 | 0 Regular 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.
     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. |

Grid lengths are in units of metres, at the parallel specified by Latin.

| 22.10.2010-->-->

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