# (C) Copyright 2005- ECMWF.

# TEMPLATE 3.30, Lambert conformal
include "grib2/template.3.shape_of_the_earth.def"

constant isGridded = true;

unsigned[4] Nx : dump;
alias Ni = Nx;
alias numberOfPointsAlongXAxis = Nx;
alias geography.Nx=Nx;

unsigned[4] Ny : dump;
alias Nj = Ny;
alias numberOfPointsAlongYAxis = Nj;
alias numberOfPointsAlongAMeridian = Nj;
alias geography.Ny=Ny;

# La1 - latitude of first grid point
signed[4] latitudeOfFirstGridPoint : edition_specific;
alias La1 = latitudeOfFirstGridPoint;
meta geography.latitudeOfFirstGridPointInDegrees
        scale(latitudeOfFirstGridPoint,one,grib2divider,truncateDegrees) : dump;
alias La1InDegrees=latitudeOfFirstGridPointInDegrees;
#meta latitudeOfFirstGridPointInMicrodegrees times(latitudeOfFirstGridPointInDegrees,oneConstant): no_copy;

# Lo1 - longitude of first grid point
unsigned[4] longitudeOfFirstGridPoint : edition_specific;
alias Lo1 = longitudeOfFirstGridPoint;
meta geography.longitudeOfFirstGridPointInDegrees
        scale(longitudeOfFirstGridPoint,one,grib2divider,truncateDegrees) : dump;
alias Lo1InDegrees = longitudeOfFirstGridPointInDegrees;
#meta longitudeOfFirstGridPointInMicrodegrees times(longitudeOfFirstGridPoint,oneConstant) : no_copy;

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

# LaD - Latitude where Dx and Dy are specified
signed[4] LaD : edition_specific;
alias latitudeWhereDxAndDyAreSpecified=LaD;
meta geography.LaDInDegrees scale(LaD,one,grib2divider,truncateDegrees) : dump;

# LoV - Longitude of meridian parallel to Y-axis along which latitude increases as the Y-coordinate increases
unsigned[4] LoV  : edition_specific;
meta geography.LoVInDegrees scale(LoV,one,grib2divider,truncateDegrees) : dump;

# Dx - X-direction grid length (in units of millimetres)
unsigned[4] Dx : edition_specific;
alias xDirectionGridLength=Dx;
alias Di =  Dx;
meta geography.DxInMetres scale(Dx,one,thousand) : dump;

# Dy - Y-direction grid length (in units of millimetres)
unsigned[4] Dy : edition_specific;
alias yDirectionGridLength=Dy;
alias Dj =  Dy;
meta geography.DyInMetres scale(Dy,one,thousand) : dump;

# Projection centre flag
flags[1] projectionCentreFlag 'grib2/tables/[tablesVersion]/3.5.table' : dump;

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

# Latin 1 - first latitude from the pole at which the secant cone cuts the sphere
signed[4] Latin1   : edition_specific;
alias firstLatitude=Latin1;
meta geography.Latin1InDegrees scale(Latin1,one,grib2divider,truncateDegrees) : dump;

# Latin 2 - second latitude from the pole at which the secant cone cuts the sphere
signed[4] Latin2  : dump;
alias secondLatitude=Latin2;
meta geography.Latin2InDegrees scale(Latin2,one,grib2divider,truncateDegrees) : dump;

# Latitude of the southern pole of projection
signed[4] latitudeOfSouthernPole : edition_specific;
alias latitudeOfTheSouthernPoleOfProjection=latitudeOfSouthernPole;
meta geography.latitudeOfSouthernPoleInDegrees scale(latitudeOfSouthernPole,one,grib2divider,truncateDegrees) : dump;

# Longitude of the southern pole of projection
unsigned[4] longitudeOfSouthernPole : edition_specific;
alias longitudeOfTheSouthernPoleOfProjection=longitudeOfSouthernPole;
meta geography.longitudeOfSouthernPoleInDegrees scale(longitudeOfSouthernPole,oneConstant,grib2divider,truncateDegrees) : dump;

iterator lambert_conformal(numberOfPoints,missingValue,values,
          radius,Nx,Ny,
          LoVInDegrees,LaDInDegrees,
          Latin1InDegrees,Latin2InDegrees,
          latitudeOfFirstGridPointInDegrees,longitudeOfFirstGridPointInDegrees,
          DxInMetres,DyInMetres,
          iScansNegatively, jScansPositively,
          jPointsAreConsecutive, alternativeRowScanning);

nearest lambert_conformal(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);
