mirror of https://github.com/ecmwf/eccodes.git
88 lines
3.5 KiB
Modula-2
88 lines
3.5 KiB
Modula-2
# (C) Copyright 2005- ECMWF.
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# TEMPLATE 3.10, Mercator
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include "grib2/template.3.shape_of_the_earth.def"
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constant isGridded = true;
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unsigned[4] Ni : dump;
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alias numberOfPointsAlongAParallel = Ni;
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alias Nx = Ni;
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alias numberOfPointsAlongXAxis = Ni;
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alias geography.Ni=Ni;
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unsigned[4] Nj : dump;
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alias numberOfPointsAlongAMeridian = Nj;
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alias Ny = Nj;
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alias numberOfPointsAlongYAxis = Nj;
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alias geography.Nj=Nj;
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# La1 - latitude of first grid point
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signed[4] latitudeOfFirstGridPoint: edition_specific,no_copy ;
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alias La1 = latitudeOfFirstGridPoint;
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meta geography.latitudeOfFirstGridPointInDegrees scale(latitudeOfFirstGridPoint,oneConstant,grib2divider,truncateDegrees) : dump;
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# Lo1 - longitude of first grid point
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signed[4] longitudeOfFirstGridPoint : edition_specific,no_copy;
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alias Lo1 = longitudeOfFirstGridPoint;
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meta geography.longitudeOfFirstGridPointInDegrees scale(longitudeOfFirstGridPoint,oneConstant,grib2divider,truncateDegrees) : dump;
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include "grib2/template.3.resolution_flags.def"
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# LaD - Latitude(s) at which the Mercator projection intersects the Earth
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# (Latitude(s) where Di and Dj are specified)
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signed[4] LaD : edition_specific,no_copy;
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meta geography.LaDInDegrees scale(LaD,oneConstant,grib2divider,truncateDegrees) : dump;
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# La2 - latitude of last grid point
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signed[4] latitudeOfLastGridPoint : edition_specific,no_copy;
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alias La2 = latitudeOfLastGridPoint;
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meta geography.latitudeOfLastGridPointInDegrees scale(latitudeOfLastGridPoint,oneConstant,grib2divider,truncateDegrees) : dump;
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# Lo2 - longitude of last grid point
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signed[4] longitudeOfLastGridPoint: edition_specific,no_copy ;
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alias Lo2 = longitudeOfLastGridPoint;
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meta geography.longitudeOfLastGridPointInDegrees scale(longitudeOfLastGridPoint,oneConstant,grib2divider,truncateDegrees) : dump;
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include "grib2/template.3.scanning_mode.def"
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# Orientation of the grid, angle between i direction on the map and the equator
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# NOTE 1: Limited to the range of 0 to 90 degrees; if the angle of orientation of the grid is neither 0 nor 90 degrees,
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# Di and Dj must be equal to each other
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unsigned[4] orientationOfTheGrid : dump ;
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meta geography.orientationOfTheGridInDegrees
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scale(orientationOfTheGrid,oneConstant,grib2divider,truncateDegrees) : dump;
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# Di - longitudinal direction grid length
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# NOTE 2: Grid lengths are in units of 10**-3 m, at the latitude specified by LaD
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unsigned[4] Di : edition_specific,no_copy;
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alias longitudinalDirectionGridLength = Di;
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meta geography.DiInMetres scale(Di,oneConstant,thousand,truncateDegrees) : dump;
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alias DxInMetres = DiInMetres;
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# Dj - latitudinal direction grid length
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# NOTE 2: Grid lengths are in units of 10**-3 m, at the latitude specified by LaD
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unsigned[4] Dj : edition_specific,no_copy ;
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alias latitudinalDirectionGridLength = Dj;
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meta geography.DjInMetres scale(Dj,oneConstant,thousand,truncateDegrees) : dump;
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alias DyInMetres = DjInMetres;
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iterator mercator(numberOfPoints,missingValue,values,
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radius,Ni,Nj,
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latitudeOfFirstGridPointInDegrees, longitudeOfFirstGridPointInDegrees,
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LaDInDegrees,
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latitudeOfLastGridPointInDegrees, longitudeOfLastGridPointInDegrees,
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orientationOfTheGridInDegrees,
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DiInMetres,DjInMetres,
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iScansNegatively, jScansPositively,
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jPointsAreConsecutive, alternativeRowScanning);
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nearest mercator(values,radius,Nx,Ny);
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meta latLonValues latlonvalues(values);
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alias latitudeLongitudeValues=latLonValues;
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meta latitudes latitudes(values,0);
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meta longitudes longitudes(values,0);
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meta distinctLatitudes latitudes(values,1);
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meta distinctLongitudes longitudes(values,1);
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