eccodes/definitions/grib2/template.3.140.def

# (C) Copyright 2005- ECMWF.

# TEMPLATE 3.140, Lambert azimuthal equal area projection
include "grib2/template.3.shape_of_the_earth.def"

constant isGridded = true;

# Nx - number of points along X-axis
unsigned[4] numberOfPointsAlongXAxis : dump;
alias Nx = numberOfPointsAlongXAxis;
alias Ni = Nx;

# Ny - number of points along Y-axis
unsigned[4] numberOfPointsAlongYAxis : dump;
alias Ny = numberOfPointsAlongYAxis;
alias numberOfPointsAlongAMeridian = Ny;
alias Nj = Ny;

# La1 - latitude of first grid point
signed[4] latitudeOfFirstGridPoint: edition_specific;
alias La1 = latitudeOfFirstGridPoint;
meta geography.latitudeOfFirstGridPointInDegrees scale(
    latitudeOfFirstGridPoint, one,grib2divider,truncateDegrees) : dump;
#meta latitudeOfFirstGridPointInMicrodegrees times(latitudeOfFirstGridPoint,mAngleMultiplier,angleDivisor): no_copy;

# Lo1 - longitude of first grid point
signed[4] longitudeOfFirstGridPoint: edition_specific ;
alias La1 = longitudeOfFirstGridPoint;
meta geography.longitudeOfFirstGridPointInDegrees scale(
    longitudeOfFirstGridPoint,one,grib2divider,truncateDegrees) : dump;

signed[4] standardParallelInMicrodegrees : dump;
alias standardParallel=standardParallelInMicrodegrees;
meta geography.standardParallelInDegrees scale(standardParallelInMicrodegrees,one,grib2divider,truncateDegrees) : dump;

signed[4] centralLongitudeInMicrodegrees : dump;
alias centralLongitude=centralLongitudeInMicrodegrees;
meta geography.centralLongitudeInDegrees scale(centralLongitudeInMicrodegrees,one,grib2divider,truncateDegrees) : dump;

# Resolution and component flag
flags[1] resolutionAndComponentFlags 'grib2/tables/[tablesVersion]/3.3.table' : dump;

# Dx - X-direction grid length in millimetres
unsigned[4] xDirectionGridLengthInMillimetres: dump;
alias Dx  = xDirectionGridLengthInMillimetres;
meta geography.xDirectionGridLengthInMetres scale(xDirectionGridLengthInMillimetres,one,thousand,truncateDegrees): dump;
alias DxInMetres = xDirectionGridLengthInMetres;

# Dy - Y-direction grid length in millimetres
unsigned[4] yDirectionGridLengthInMillimetres : dump ;
alias Dy  = yDirectionGridLengthInMillimetres ;
meta geography.yDirectionGridLengthInMetres scale(yDirectionGridLengthInMillimetres,one,thousand,truncateDegrees): dump;
alias DyInMetres = yDirectionGridLengthInMetres;

include "grib2/template.3.scanning_mode.def"

iterator lambert_azimuthal_equal_area(
    numberOfPoints,missingValue,values,
    radius,Nx,Ny,
    latitudeOfFirstGridPointInDegrees,longitudeOfFirstGridPointInDegrees,
    standardParallelInDegrees,centralLongitudeInDegrees,
    Dx,Dy,
    iScansNegatively, jScansPositively,
    jPointsAreConsecutive, alternativeRowScanning);

nearest lambert_azimuthal_equal_area(values,radius,Nx,Ny);

meta latLonValues latlonvalues(values);
alias latitudeLongitudeValues=latLonValues;
meta latitudes latitudes(values,0);
meta longitudes longitudes(values,0);
meta distinctLatitudes latitudes(values,1);
meta distinctLongitudes longitudes(values,1);