mirror of https://github.com/ecmwf/eccodes.git
110 lines
4.5 KiB
Modula-2
110 lines
4.5 KiB
Modula-2
# Copyright 2005-2012 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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# START grib2::section
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# SECTION 3, GRID DEFINITION SECTION
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# Length of section in octets
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# For grib2 -> 1
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constant gridDescriptionSectionPresent = 1;
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position offsetSection3;
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length[4] section3Length ;
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meta section3Pointer section_pointer(offsetSection3,section3Length,3);
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# Number of section
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unsigned[1] numberOfSection = 3 :read_only;
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# Source of grid definition
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# NOTE 1 NOT FOUND
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codetable[1] sourceOfGridDefinition ('3.0.table',masterDir,localDir) ;
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# Number of data points
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unsigned[4] numberOfDataPoints : dump;
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alias numberOfPoints=numberOfDataPoints;
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# Number of octets for optional list of numbers defining number of points
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# NOTE 2 NOT FOUND
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unsigned[1] numberOfOctectsForNumberOfPoints;
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# Interpretation of list of numbers defining number of points
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codetable[1] interpretationOfNumberOfPoints ('3.11.table',masterDir,localDir) : dump;
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if(numberOfOctectsForNumberOfPoints == 0){
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transient PLPresent = 0 ;
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}else{
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transient PLPresent = 1 ;
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}
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codetable[2] gridDefinitionTemplateNumber ('3.1.table',masterDir,localDir) =0 : dump,edition_specific;
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template gridDefinitionSection "grib2/template.3.[gridDefinitionTemplateNumber:l].def";
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if(PLPresent){
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if(numberOfOctectsForNumberOfPoints == 1){
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unsigned[1] pl[Nj] : dump;
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}
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if(numberOfOctectsForNumberOfPoints == 2){
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unsigned[2] pl[Nj] : dump;
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}
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if(numberOfOctectsForNumberOfPoints == 3){
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unsigned[3] pl[Nj] : dump;
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}
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alias geography.pl=pl;
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}
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when (PLPresent == 0) {
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set numberOfOctectsForNumberOfPoints = 0;
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set interpretationOfNumberOfPoints = 0;
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}
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section_padding section3Padding : read_only;
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concept gridType {
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"regular_ll" = { gridDefinitionTemplateNumber=0; PLPresent=0; }
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"reduced_ll" = { gridDefinitionTemplateNumber=0; PLPresent=1; }
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"rotated_ll" = { gridDefinitionTemplateNumber=1; PLPresent=0; }
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"stretched_ll" = { gridDefinitionTemplateNumber=2; PLPresent=0; }
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"stretched_rotated_ll" = { gridDefinitionTemplateNumber=3; PLPresent=0; }
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"mercator" = { gridDefinitionTemplateNumber=10; PLPresent=0; }
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"transverse_mercator" = { gridDefinitionTemplateNumber=12; PLPresent=0; }
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"polar_stereographic" = { gridDefinitionTemplateNumber=20; PLPresent=0; }
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"lambert" = { gridDefinitionTemplateNumber=30; PLPresent=0; }
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"albers" = { gridDefinitionTemplateNumber=31; PLPresent=0; }
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"regular_gg" = { gridDefinitionTemplateNumber=40; PLPresent=0; }
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"reduced_gg" = { gridDefinitionTemplateNumber=40; PLPresent=1; numberOfOctectsForNumberOfPoints=2;iDirectionIncrementGiven=0;numberOfPointsAlongAParallel = missing(); }
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"rotated_gg" = { gridDefinitionTemplateNumber=41; PLPresent=0; }
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"stretched_gg" = { gridDefinitionTemplateNumber=42; PLPresent=0; }
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"stretched_rotated_gg" = { gridDefinitionTemplateNumber=43; PLPresent=0; }
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"sh" = { gridDefinitionTemplateNumber=50; PLPresent=0;}
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"rotated_sh" = { gridDefinitionTemplateNumber=51; PLPresent=0;}
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"stretched_sh" = { gridDefinitionTemplateNumber=52; PLPresent=0;}
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"stretched_rotated_sh" = { gridDefinitionTemplateNumber=53; PLPresent=0;}
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"space_view" = { gridDefinitionTemplateNumber=90; PLPresent=0;}
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"triangular_grid" = { gridDefinitionTemplateNumber=100;PLPresent=0;}
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"unstructured_grid" = { gridDefinitionTemplateNumber=101;PLPresent=0;}
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"equatorial_azimuthal_equidistant" = { gridDefinitionTemplateNumber=110; PLPresent=0;}
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"azimuth_range" = { gridDefinitionTemplateNumber=120;PLPresent=0; }
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"irregular_latlon" = { gridDefinitionTemplateNumber=130;PLPresent=0; }
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"lambert_azimuthal_equal_area"= { gridDefinitionTemplateNumber=140;PLPresent=0; }
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"cross_section" = { gridDefinitionTemplateNumber=1000;PLPresent=0; }
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"Hovmoller" = { gridDefinitionTemplateNumber=1100;PLPresent=0; }
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"time_section" = { gridDefinitionTemplateNumber=1200;PLPresent=0; }
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"unknown" = {PLPresent=0;}
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"unknown_PLPresent" = {PLPresent=1;}
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} : dump;
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alias ls.gridType=gridType;
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alias geography.gridType=gridType;
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alias typeOfGrid=gridType;
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meta md5Section3 md5(offsetSection3,section3Length);
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alias md5GridSection = md5Section3;
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