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< caption class = "gribex" > < strong > Sub-area of a quasi-regular
gaussian grid (ECMWF convention)< / strong > < / caption > < tbody >
< tr class = "gribex" >
< th > Element < / th >
< th > Contents < / th >
< th style = "vertical-align: top; text-align: center;" >
GRIB API keys< / th >
< / tr >
< tr class = "gribex" >
< td class = "gribex" > 1 < / td >
< td class = "gribex" > Data representation type, = 4< / td >
< th style = "vertical-align: top; text-align: left;" > < a href = "/publications/manuals/d/gribapi/keys/grids/" > gridType< / a >
< / th >
< / tr >
< tr class = "gribex" >
< td class = "gribex" > 2 < / td >
< td class = "gribex" > Not specified for quasi-regular
(reduced) grids. < / td >
< th style = "vertical-align: top; text-align: left;" > < br >
< / th >
< / tr >
< tr class = "gribex" >
< td class = "gribex" > 3 < / td >
< td class = "gribex" > Number of points along a meridian (Nj).
< / td >
< th style = "vertical-align: top; text-align: left;" > Nj< br > Ny
< / th >
< / tr >
< tr class = "gribex" >
< td class = "gribex" > 4 < / td >
< td class = "gribex" > Latitude of the first grid point, La1. < / td >
< th style = "vertical-align: top; text-align: left;" > latitudeOfFirstGridPointInDegrees*1000
< / th >
< / tr >
< tr class = "gribex" >
< td class = "gribex" > 5 < / td >
< td class = "gribex" > Longitude of the first grid point, Lo1.
< / td >
< th style = "vertical-align: top; text-align: left;" > longitudeOfFirstGridPointInDegrees*1000
< / th >
< / tr >
< tr class = "gribex" >
< td class = "gribex" > 6 < / td >
< td class = "gribex" > Resolution flag, = 0 (direction
increments not given) < / td >
< th style = "vertical-align: top; text-align: left;" > ijDirectionIncrementGiven*128
< / th >
< / tr >
< tr class = "gribex" >
< td class = "gribex" > 7 < / td >
< td class = "gribex" > Latitude of the last grid point, La2. < / td >
< th style = "vertical-align: top; text-align: left;" > latitudeOfLastGridPointInDegrees*1000
< / th >
< / tr >
< tr class = "gribex" >
< td class = "gribex" > 8 < / td >
< td class = "gribex" > Longitude of the last grid point, Lo2. < / td >
< th style = "vertical-align: top; text-align: left;" > longitudeOfLastGridPointInDegrees*1000
< / th >
< / tr >
< tr class = "gribex" >
< td class = "gribex" > 9 < / td >
< td class = "gribex" > i direction increment. Cannot be used
for quasi-regular (reduced) grids. < / td >
< th style = "vertical-align: top; text-align: left;" > iDirectionIncrementInDegrees*1000
< / th >
< / tr >
< tr class = "gribex" >
< td class = "gribex" > 10 < / td >
< td class = "gribex" > Number of parallels between a pole and
the Equator,ie the gaussian grid number. < / td >
< th style = "vertical-align: top; text-align: left;" > numberOfParallelsBetweenAPoleAndTheEquator
< / th >
< / tr >
< tr class = "gribex" >
< td class = "gribex" > 11 < / td >
< td class = "gribex" > Scanning mode flags (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 class = "gribex" >
< td class = "gribex" > 12 < / td >
< td class = "gribex" > Number of vertical coordinate
parameters. < / td >
< th style = "vertical-align: top; text-align: left;" > NV < / th >
< / tr >
< tr class = "gribex" >
< td class = "gribex" > 13 < / td >
< td class = "gribex" > Latitude of the southern pole of
rotation. < / td >
< th style = "vertical-align: top; text-align: left;" > latitudeOfSouthernPoleInDegrees*1000
< / th >
< / tr >
< tr class = "gribex" >
< td class = "gribex" > 14 < / td >
< td class = "gribex" > Longitude of the southern pole of
rotation. < / td >
< th style = "vertical-align: top; text-align: left;" > longitudeOfSouthernPoleInDegrees*1000
< / th >
< / tr >
< tr class = "gribex" >
< td class = "gribex" > 15 < / td >
< td class = "gribex" > Latitude of the pole of stretching. < / td >
< th style = "vertical-align: top; text-align: left;" > latitudeOfPoleOfStretchingInDegrees
*1000 < / th >
< / tr >
< tr class = "gribex" >
< td class = "gribex" > 16 < / td >
< td class = "gribex" > Longitude of the pole of stretching. < / td >
< th style = "vertical-align: top; text-align: left;" > longitudeOfPoleOfStretchingInDegrees
*1000 < / th >
< / tr >
< tr class = "gribex" >
< td class = "gribex" > 17 < / td >
< td class = "gribex" > 1 = quasi-regular (reduced) grid. < / td >
< th style = "vertical-align: top; text-align: left;" > < a href = "/publications/manuals/d/gribapi/keys/grids/" > gridType< / a >
< / th >
< / tr >
< tr class = "gribex" >
< td class = "gribex" > 18 < / td >
< td class = "gribex" >
< pre class = "gribex" > 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 class = "gribex" >
< td class = "gribex" > 19 < / td >
< td class = "gribex" >
< pre class = "gribex" > Components flag.< br > 0 Resolved u and v components of vector quantities relative to easterly< br > and northerly directions; or not used.< 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 class = "gribex" >
< td class = "gribex" > 20-22 < / td >
< td class = "gribex" > Reserved. Set to 0. < / td >
< th style = "vertical-align: top; text-align: left;" > < br >
< / th >
< / tr >
< tr class = "gribex" >
< td class = "gribex" > 23-nn < / td >
< td class = "gribex" > NN, the number of points along a full
parallel (360 degrees) is defined for each latitude row in the
sub-area. The number of parallels is given by Nj above. See the
algorithm below for calculating the actual number of points along each
sub-area latitude row < strong > (ECMWF convention)< / strong > .< / td >
< th style = "vertical-align: top; text-align: left;" > pl < / th >
< / tr >
< / tbody >
< / table >
< p > The number of points Np within a subarea along a parallel of
a reduced grid can be obtained as: < / p >
< pre > Np = [(Loe-Low)/Res] + 1< br > < br > where:< br > < br > Loe = Lo2< br > Res = 360000/NN< br > If Mod(Lo1/Res,1.0) = 0,< br > Incr = 0< br > otherwise< br > Incr = 1< br > Ninter = [Lo1/Res] + Incr < br > Low = Ninter*Res ; Low -> (Low - 360000) if Lo2 is less then Lo1.< br > < br > < / pre >
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<!-- #EndEditable --> < / span > < / td >
< td bgcolor = "#CCCE9B" > < span class = "editor" > < a href =
"/tools/detailer/">< img alt = "Page Details" src =
"/assets/icons/detailer.gif" border="0" width="18" height="18">< / a >
<!-- #BeginEditable "editor" --> <!-- #EndEditable --> < / span > < / td >
< td bgcolor = "#CCCE9B" > < span class = "copyright" > < a href =
"/frontpage/copyright/">© ECMWF< / a > < / span > < / td >
< td > <!-- #BeginEditable "botprevnext" --> <!-- #EndEditable --> < / td >
< / tr >
< / table >
< / td >
< / tr >
< tr >
< td height = "1" width = "136" bgcolor = "#CCCB9E" > < img alt = "shim"
height="1" width="136" src="/assets/shim.gif">< / td >
< td height = "1" width = "008" bgcolor = "#CCCB9E" > < img alt = "shim"
height="1" width="8" src="/assets/shim.gif">< / td >
< td height = "1" width = "100%" bgcolor = "#CCCB9E" > < img alt = "shim"
height="1" width="160" src="/assets/shim.gif">< / td >
< / tr >
< / table >
< / body >
<!-- #EndTemplate -->
< / html >
