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< caption > < strong > Lambert conformal, secant or tangent, conical
or bi-polar (normal or
oblique) or Albers equal-area, secant or tangent, conical or bi-polar
(normal or oblique) < / strong > < / caption > < tbody >
< tr >
< th > Element < / th >
< th > Contents < / th >
< th style = "vertical-align: top; text-align: center;" >
GRIB API keys< / th >
< / tr >
< tr >
< td > 1 < / td >
< td >
< pre > Data representation type (see < a
href="/publications/manuals/d/gribapi/fm92/grib1/show/ctables/">WMO code table 6< / a > ); eg< br > 3 Lambert conformal< br > 8 Albers equal area< br > 13 Oblique Lambert conformal< br > < / pre >
< / td >
< th style = "vertical-align: top; text-align: left;" > < a href = "/publications/manuals/d/gribapi/keys/grids/" > gridType< / a >
< / th >
< / tr >
< tr >
< td > 2 < / td >
< td > Number of points along X-axis. < / td >
< th style = "vertical-align: top; text-align: left;" > Nx< br > Ni< br >
< / th >
< / tr >
< tr >
< td > 3 < / td >
< td > Number of points along Y-axis. < / td >
< th style = "vertical-align: top; text-align: left;" > Ny< br > Nj
< / th >
< / tr >
< tr >
< td > 4 < / td >
< td > Latitude of the first grid point. < / td >
< th style = "vertical-align: top; text-align: left;" > latitudeOfFirstGridPointInDegrees*1000< br >
< / th >
< / tr >
< tr >
< td > 5 < / td >
< td > Longitude of the first grid point. < / td >
< th style = "vertical-align: top; text-align: left;" > longitudeOfFirstGridPointInDegrees*1000< br >
< / th >
< / tr >
< tr >
< td > 6 < / td >
< td >
< pre > Resolution flag:< br > 0 Direction increments not given.< br > 128 Direction increments given.< br > < / pre >
< / td >
< th style = "vertical-align: top; text-align: left;" > ijDirectionIncrementGiven*128
< / th >
< / tr >
< tr >
< td > 7 < / td >
< td > Orientation of the grid. The East longitude of the
meridian which is parallel to the Y-axis along which latitude increases
as the Y-coordinate increases. < / td >
< th style = "vertical-align: top; text-align: left;" > orientationOfTheGridInDegrees*1000< br >
< / th >
< / tr >
< tr >
< td > 8 < / td >
< td > Reserved. Set to 0. < / td >
< th style = "vertical-align: top; text-align: left;" > < br >
< / th >
< / tr >
< tr >
< td > 9 < / td >
< td > X-direction grid length. < / td >
< th style = "vertical-align: top; text-align: left;" > xDirectionGridLength< br >
< / th >
< / tr >
< tr >
< td > 10 < / td >
< td > Y-direction grid length. < / td >
< th style = "vertical-align: top; text-align: left;" > yDirectionGridLength< br >
< / th >
< / tr >
< tr >
< td > 11 < / td >
< td > Scanning mode flag (see < a
href="/publications/manuals/d/gribapi/fm92/grib1/show/ctables/">WMO
code table 8< / a > ) < / td >
< th style = "vertical-align: top; text-align: left;" >
< p > iScansNegatively< / p >
< p > jScansNegatively< / p >
< p > jPointsAreConsecutive< / p >
< / th >
< / tr >
< tr >
< td > 12 < / td >
< td > Number of vertical coordinate parameters. < / td >
< th style = "vertical-align: top; text-align: left;" > NV< br >
< / th >
< / tr >
< tr >
< td > 13 < / td >
< td >
< pre > Projection centre flag:< br > 0 North pole is on the projection plane.< br > Only one projection centre is used.< br > 128 South pole is on the projection plane.< br > Only one projection centre is used.< br > 64 North pole is on the projection plane.< br > Projection is bi-polar and symmetric.< br > 192 South pole is on the projection plane. < br > Projection is bi-polar and symmetric.< br > < / pre >
< / td >
< th style = "vertical-align: top; text-align: left;" > projectionCenterFlag< br >
< / th >
< / tr >
< tr >
< td > 14 < / td >
< td > First latitude from the pole at which the secant cone
cuts the sphere. < / td >
< th style = "vertical-align: top; text-align: left;" > firstLatitudeFromThePoleAtWhichTheSecantConeCutsTheSphereInDegrees*1000
< / th >
< / tr >
< tr >
< td > 15 < / td >
< td > Second latitude at which the secant cone cuts the
sphere. < / td >
< th style = "vertical-align: top; text-align: left;" > secondLatitudeFromThePoleAtWhichTheSecantConeCutsTheSphereInDegrees*1000
< / th >
< / tr >
< tr >
< td > 16 < / td >
< td > Reserved. Set to 0. < / td >
< th style = "vertical-align: top; text-align: left;" > < br >
< / th >
< / tr >
< tr >
< td > 17 < / td >
< td > 0 Regular grid < / td >
< th style = "vertical-align: top; text-align: left;" > < a href = "/publications/manuals/d/gribapi/keys/grids/" > gridType< / a >
< / th >
< / tr >
< tr >
< td > 18 < / td >
< td >
< pre > Earth flag:< br > 0 Earth assumed spherical with radius 6367.47 km.< br > 64 Earth assumed oblate spheroidal with size as determined by IAU in 1965:< br > 6378.160km, 6356.775km, f=1/297.0< br > < / pre >
< / td >
< th style = "vertical-align: top; text-align: left;" > earthIsOblate
< / th >
< / tr >
< tr >
< td > 19 < / td >
< td >
< pre > Components flag:< br > 0 Resolved u and v components of vector quantities relative to easterly< br > and northerly directions.< br > 8 Resolved u and v components of vector quantities relative to the< br > defined grid in the direction of increasing x and y (or i and j)< br > coordinates respectively.< br > < / pre >
< / td >
< th style = "vertical-align: top; text-align: left;" > uvRelativeToGrid
< / th >
< / tr >
< tr >
< td > 20 < / td >
< td > Latitude of the southern pole. < / td >
< th style = "vertical-align: top; text-align: left;" > latitudeOfSouthernPoleInDegrees*1000< br >
< / th >
< / tr >
< tr >
< td > 21 < / td >
< td > Longitude of the southern pole. < / td >
< th style = "vertical-align: top; text-align: left;" > longitudeOfSouthernPoleInDegrees*1000< br >
< / th >
< / tr >
< tr >
< td > 22 < / td >
< td > Reserved. Set to 0. < / td >
< th style = "vertical-align: top; text-align: left;" > < br >
< / th >
< / tr >
< / tbody >
< / table >
< p > Notes: Grid lengths are in metres, at the 60-degree parallel
nearest to
the pole on the projection plane.
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