mirror of https://github.com/ecmwf/eccodes.git
130 lines
5.9 KiB
Modula-2
130 lines
5.9 KiB
Modula-2
# (C) Copyright 2005- ECMWF.
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# SECTION 3, GRID DEFINITION SECTION
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# For grib2 -> 1
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constant gridDescriptionSectionPresent = 1;
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position offsetSection3;
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section_length[4] section3Length ;
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meta section3Pointer section_pointer(offsetSection3,section3Length,3);
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unsigned[1] numberOfSection = 3 :read_only;
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# Source of grid definition
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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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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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meta gridDefinitionDescription codetable_title(gridDefinitionTemplateNumber);
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alias isRotatedGrid=zero;
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if (gridDefinitionTemplateNumber >= 32768) {
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template gridDefinitionSection "grib2/local/[centreForLocal]/template.3.[gridDefinitionTemplateNumber:l].def";
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} else {
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template gridDefinitionSection "grib2/template.3.[gridDefinitionTemplateNumber:l].def";
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}
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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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"reduced_rotated_gg" = { gridDefinitionTemplateNumber=41; PLPresent=1; numberOfOctectsForNumberOfPoints=2;iDirectionIncrementGiven=0;numberOfPointsAlongAParallel = missing(); }
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"stretched_gg" = { gridDefinitionTemplateNumber=42; PLPresent=0; }
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"reduced_stretched_gg" = { gridDefinitionTemplateNumber=42; PLPresent=1; numberOfOctectsForNumberOfPoints=2;iDirectionIncrementGiven=0;numberOfPointsAlongAParallel = missing(); }
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"stretched_rotated_gg" = { gridDefinitionTemplateNumber=43; PLPresent=0; }
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"reduced_stretched_rotated_gg" = { gridDefinitionTemplateNumber=43; PLPresent=1; numberOfOctectsForNumberOfPoints=2;iDirectionIncrementGiven=0;numberOfPointsAlongAParallel = missing(); }
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# For consistency add the prefix regular_
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"regular_rotated_gg" = { gridDefinitionTemplateNumber=41; PLPresent=0; } # = rotated_gg
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"regular_stretched_gg" = { gridDefinitionTemplateNumber=42; PLPresent=0; } # = stretched_gg
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"regular_stretched_rotated_gg" = { gridDefinitionTemplateNumber=43; PLPresent=0; } # = stretched_rotated_gg
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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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"lambert_lam" = { gridDefinitionTemplateNumber=33; PLPresent=0; }
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"mercator_lam" = { gridDefinitionTemplateNumber=13; PLPresent=0; }
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"polar_stereographic_lam" = { gridDefinitionTemplateNumber=23; PLPresent=0; }
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"lambert_bf" = { gridDefinitionTemplateNumber=63; PLPresent=0; }
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"mercator_bf" = { gridDefinitionTemplateNumber=61; PLPresent=0; }
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"polar_stereographic_bf" = { gridDefinitionTemplateNumber=62; PLPresent=0; }
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"ncep_32769" = { centre=7; gridDefinitionTemplateNumber=32769; 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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meta projSourceString proj_string(gridType, 0): hidden;
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meta projTargetString proj_string(gridType, 1): hidden;
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alias projString = projTargetString : hidden;
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