mirror of https://github.com/ecmwf/eccodes.git
101 lines
4.2 KiB
Modula-2
101 lines
4.2 KiB
Modula-2
# Copyright 2005-2017 ECMWF.
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#
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# This software is licensed under the terms of the Apache Licence Version 2.0
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# which can be obtained at http://www.apache.org/licenses/LICENSE-2.0.
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#
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# In applying this licence, ECMWF does not waive the privileges and immunities granted to it by
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# virtue of its status as an intergovernmental organisation nor does it submit to any jurisdiction.
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#
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# GRID DEFINITION quasi-regular latitude/longitude grid
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# grib 1 -> 2
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constant gridDefinitionTemplateNumber = 0;
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unsigned[2] NRj : can_be_missing,dump;
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unsigned[2] numberOfPointsAlongAMeridian : can_be_missing,dump;
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alias Nj = numberOfPointsAlongAMeridian;
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# Latitudes and Longitudes of the first and the last points
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# Resolution and component flags
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include "grib1/grid_first_last_resandcomp.def";
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unsigned[2] iDirectionIncrement : can_be_missing;
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unsigned[2] jDirectionIncrement : can_be_missing;
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alias Dj = jDirectionIncrement;
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alias Di = iDirectionIncrement;
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# for change_scanning_direction
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alias yFirst=latitudeOfFirstGridPointInDegrees;
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alias yLast=latitudeOfLastGridPointInDegrees;
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alias xFirst=longitudeOfFirstGridPointInDegrees;
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alias xLast=longitudeOfLastGridPointInDegrees;
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include "grib1/scanning_mode.def";
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# Lar1 - latitude of first grid point of reference domain
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signed[3] Lar1 : edition_specific;
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meta geography.Lar1InDegrees scale(latitudeOfFirstGridPointOfReferenceDomain,oneConstant,grib1divider,truncateDegrees) :dump;
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alias La1 = Lar1;
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# Lor1 - longitude of first grid point of reference domain
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signed[3] Lor1 : edition_specific;
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meta geography.Lor1InDegrees scale(longitudeOfFirstGridPointOfReferenceDomain,oneConstant,grib1divider,truncateDegrees) : dump;
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alias Lo1 = Lor1;
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# Lar2 - latitude of last grid point of reference domain
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signed[3] Lar2 : edition_specific;
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meta geography.Lar2InDegrees scale(latitudeOfLastGridPointOfReferenceDomain,oneConstant,grib1divider,truncateDegrees) : dump;
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alias La2 = Lar2;
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# Lor2 - longitude of last grid point of reference domain
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signed[3] Lor2 ;
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meta geography.Lor2InDegrees scale(longitudeOfLastGridPointOfReferenceDomain,oneConstant,grib1divider,truncateDegrees) : dump;
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alias Lo2 = Lor2;
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meta geography.jDirectionIncrementInDegrees latlon_increment(ijDirectionIncrementGiven,jDirectionIncrement,
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jScansPositively,
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latitudeOfFirstGridPointInDegrees,latitudeOfLastGridPointInDegrees,
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numberOfPointsAlongAMeridian,oneConstant,grib1divider,0) : can_be_missing,dump;
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#transient DjInMicrodegrees = times(jDirectionIncrement,thousand);
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meta geography.iDirectionIncrementInDegrees latlon_increment(ijDirectionIncrementGiven,iDirectionIncrement,
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iScansPositively,
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longitudeOfFirstGridPointInDegrees,longitudeOfLastGridPointInDegrees,
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Ni,oneConstant,grib1divider,1) : can_be_missing,dump;
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#meta DiInMicrodegrees times(iDirectionIncrement,thousand);
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alias latitudeFirstInDegrees = latitudeOfFirstGridPointInDegrees;
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alias longitudeFirstInDegrees = longitudeOfFirstGridPointInDegrees;
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alias latitudeLastInDegrees = latitudeOfLastGridPointInDegrees;
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alias longitudeLastInDegrees = longitudeOfLastGridPointInDegrees;
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alias DiInDegrees = iDirectionIncrementInDegrees;
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alias DjInDegrees = jDirectionIncrementInDegrees;
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meta numberOfDataPoints number_of_points(Ni,Nj,PLPresent,pl) : dump;
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alias numberOfPoints=numberOfDataPoints;
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meta numberOfValues number_of_values(values,bitsPerValue,numberOfDataPoints,bitmapPresent,bitmap,numberOfCodedValues) : dump;
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#alias ls.valuesCount=numberOfValues;
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if(missing(Ni)){
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iterator latlon_reduced(numberOfPoints,missingValue,values,
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latitudeFirstInDegrees,longitudeFirstInDegrees,
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latitudeLastInDegrees,loLast,
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Nj,DjInDegrees,pl);
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nearest latlon_reduced(values,radius,Nj,pl);
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} else {
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iterator latlon(numberOfPoints,missingValue,values,longitudeFirstInDegrees,iInc ,
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Ni,Nj,iScansNegatively ,
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latitudeFirstInDegrees,DjInDegrees,jScansPositively );
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nearest regular(values,radius,Ni,Nj);
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}
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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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# END 1/grid_definition.latitude_longitude_grid ----------------------------------------------------------------------
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