/usr/share/eccodes/definitions/grib2/template.3.20.def is in libeccodes-data 2.0.2-5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 | # Copyright 2005-2016 ECMWF.
#
# This software is licensed under the terms of the Apache Licence Version 2.0
# which can be obtained at http://www.apache.org/licenses/LICENSE-2.0.
#
# In applying this licence, ECMWF does not waive the privileges and immunities granted to it by
# virtue of its status as an intergovernmental organisation nor does it submit to any jurisdiction.
#
# START 2/template.3.20 ----------------------------------------------------------------------
# TEMPLATE 3.20, Polar stereographic projection
include "grib2/template.3.shape_of_the_earth.def";
transient oneThousand=1000;
# Nx - number of points along X-axis
unsigned[4] Nx : dump;
alias Ni = Nx;
alias numberOfPointsAlongXAxis = Nx;
alias geography.Nx=Nx;
# Ny - number of points along Y-axis
unsigned[4] Ny : dump;
alias Nj = Ny;
alias numberOfPointsAlongYAxis = Ny;
alias geography.Ny=Ny;
# La1 - latitude of first grid point
signed[4] latitudeOfFirstGridPoint : edition_specific ;
meta geography.latitudeOfFirstGridPointInDegrees scale(latitudeOfFirstGridPoint,oneConstant,grib2divider,truncateDegrees) : dump;
alias La1 = latitudeOfFirstGridPoint;
# Lo1 - longitude of first grid point
unsigned[4] longitudeOfFirstGridPoint : edition_specific;
meta geography.longitudeOfFirstGridPointInDegrees scale(longitudeOfFirstGridPoint,oneConstant,grib2divider,truncateDegrees) : dump;
alias Lo1 = longitudeOfFirstGridPoint;
# Resolution and component flag
# NOTE 1 NOT FOUND
flags[1] resolutionAndComponentFlags 'grib2/tables/[tablesVersion]/3.3.table' : dump;
# LaD - Latitude where Dx and Dy are specified
signed[4] LaD : edition_specific;
alias latitudeWhereDxAndDyAreSpecified=LaD;
meta geography.LaDInDegrees scale(LaD,oneConstant,grib2divider,truncateDegrees) : dump;
alias latitudeWhereDxAndDyAreSpecifiedInDegrees=LaDInDegrees;
# LoV - orientation of the grid
# NOTE 2 NOT FOUND
signed[4] orientationOfTheGrid : edition_specific;
alias LoV = orientationOfTheGrid ;
meta geography.orientationOfTheGridInDegrees scale(orientationOfTheGrid,oneConstant,grib2divider,truncateDegrees) : dump;
# Dx - X-direction grid length
# NOTE 3: Grid length is in units of 10-3 m at the latitude specified by LaD
unsigned[4] Dx : edition_specific;
meta geography.DxInMetres scale(Dx,one,thousand,truncateDegrees) : dump;
alias xDirectionGridLength=Dx;
# Dy - Y-direction grid length
# NOTE 3: Grid length is in units of 10-3 m at the latitude specified by LaD
unsigned[4] Dy : edition_specific;
meta geography.DyInMetres scale(Dy,one,thousand,truncateDegrees) : dump;
alias yDirectionGridLength=Dy;
# Projection centre flag
flags[1] projectionCentreFlag 'grib2/tables/[tablesVersion]/3.5.table' : dump;
# Note our flagbit numbers go from 7 to 0, while WMO convention is from 1 to 8
# If bit 1 is 0, then the North Pole is on the projection plane
# If bit 1 is 1, then the South Pole is on the projection plane
flagbit southPoleOnProjectionPlane(projectionCentreFlag,7) : dump; # WMO bit 1
include "grib2/template.3.scanning_mode.def";
iterator polar_stereographic(numberOfPoints,missingValue,values,
radius,Nx,Ny,
latitudeOfFirstGridPointInDegrees,longitudeOfFirstGridPointInDegrees,
southPoleOnProjectionPlane,
orientationOfTheGridInDegrees,
DxInMetres,DyInMetres,
iScansNegatively,
jScansPositively,
jPointsAreConsecutive,
alternativeRowScanning);
# END 2/template.3.20 ----------------------------------------------------------------------
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