| | 15 | == Mapping from CF Grid Mapping Attributes to CRS WKT Elements == |
| | 16 | |
| | 17 | Adapted from https://cf-pcmdi.llnl.gov/trac/wiki/Cf2CrsWkt |
| | 18 | |
| | 19 | || '''CF Grid Mapping Attribute''' || '''Corresponding WKT Syntax (1)''' || |
| | 20 | || `earth_radius` || `SPHEROID["<reference_ellipsoid_name>", <semi_major_axis>, 0.0, ...]` || |
| | 21 | || `false_easting` || `PARAMETER["False easting", <value>]` || |
| | 22 | || `false_northing` || `PARAMETER["False northing", <value>]` || |
| | 23 | || `grid_mapping_name` || no known equivalent || |
| | 24 | || `grid_north_pole_latitude` || no known equivalent || |
| | 25 | || `grid_north_pole_longitude` || no known equivalent || |
| | 26 | || `inverse_flattening` || `SPHEROID["<reference_ellipsoid_name>", <semi_major_axis>, <inverse_flattening>, ...]` || |
| | 27 | || `latitude_of_projection_origin` || `PARAMETER["Latitude of natural origin", <value>]` || |
| | 28 | || `longitude_of_central_meridian` || `PARAMETER["Longitude of natural origin", <value>]` || |
| | 29 | || `longitude_of_prime_meridian` || `PRIMEM["<prime_meridian_name>", <longitude_of_prime_meridian>, ...]` || |
| | 30 | || `longitude_of_projection_origin` || `PARAMETER["Longitude of natural origin", <value>]` || |
| | 31 | || `north_pole_grid_longitude` || no known equivalent || |
| | 32 | || `perspective_point_height` || `PARAMETER["Viewpoint height", <value>]` || |
| | 33 | || `scale_factor_at_central_meridian` || `PARAMETER["Scale factor at natural origin", <value>]` || |
| | 34 | || `scale_factor_at_projection_origin` || `PARAMETER["Scale factor at natural origin", <value>]` || |
| | 35 | || `semi_major_axis` || `SPHEROID["<reference_ellipsoid_name>", <semi_major_axis>, <inverse_flattening>, ...]` || |
| | 36 | || `semi_minor_axis` || no direct equivalent, the `SPHEROID` element is used to define ellipsoid geometry || |
| | 37 | || `standard_parallel` (one parallel) || `PARAMETER["Latitude of standard parallel", <value>]` || |
| | 38 | || `standard_parallel` (two parallels) || `PARAMETER["Latitude of 1st standard parallel", <value>], PARAMETER["Latitude of 2nd standard parallel", <value>]` || |
| | 39 | || || || |
| | 40 | || `straight_vertical_longitude_from_pole` || `PARAMETER["Longitude of origin", <value>]` || |
| | 41 | || `projected_coordinate_system_name` || `PROJCS["<projected_coordinate_system_name>", ...]` || |
| | 42 | || `geographic_coordinate_system_name` || `GEOGCS["<geographic_coordinate_system_name>", ...]` || |
| | 43 | || `horizontal_datum_name` || `GEOGCS["<name>", DATUM["<horizontal_datum_name>", ...] ]` || |
| | 44 | || `reference_ellipsoid_name` || `GEOGCS["<name>", DATUM["<name>", SPHEROID["<reference_ellipsoid_name>", ...] ] ]` || |
| | 45 | || `towgs84` || `GEOGCS["<name>", DATUM["<name>", TOWGS84[<7 params>] ]` || |
| | 46 | || `prime_meridian_name` || `GEOGCS["<name>",PRIMEM["<prime_meridian_name>",<value>]` || |
| | 47 | |
| 35 | | ||'''Projection'''||'''Name'''||'''CF'''||'''OGC WKT'''||'''PROJ.4'''||'''EPSG'''||'''Note'''|| |
| 36 | | || || || || || || || || |
| 37 | | ||'''AEA'''||Albers Equal Area||albers_conical_equal_area||Albers_Conic_Equal_Area||+proj=aea||9822|| || |
| 38 | | || || ||standard_parallel![1]||standard_parallel_1||+lat_1|| || || |
| 39 | | || || ||standard_parallel![2]||standard_parallel_2||+lat_2|| || || |
| 40 | | || || ||longitude_of_central_meridian||longitude_of_center||+lon_0|| || || |
| 41 | | || || ||latitude_of_projection_origin||latitude_of_center||+lat_0|| || || |
| 42 | | || || || || || || || || |
| 43 | | ||'''AE'''||Azimuthal equidistant||azimuthal_equidistant||Azimuthal_Equidistant||+proj=aeqd||9832|| || |
| 44 | | || || ||longitude_of_projection_origin||longitude_of_center||+lon_0|| || || |
| 45 | | || || ||latitude_of_projection_origin||latitude_of_center||+lat_0|| || || |
| 46 | | || || || || || || || || |
| 47 | | ||'''LAEA'''||Lambert azimuthal equal area||lambert_azimuthal_equal_area||Lambert_Azimuthal_Equal_Area||+proj=laea||9820|| || |
| 48 | | || || ||longitude_of_projection_origin||longitude_of_center||+lon_0|| || || |
| 49 | | || || ||latitude_of_projection_origin||latitude_of_center||+lat_0|| || || |
| 50 | | || || || || || || || || |
| 51 | | ||'''LCC-1SP'''||Lambert conformal||lambert_conformal_conic||Lambert_Conformal_Conic_1SP||+proj=lcc||9801||(3) [http://www.remotesensing.org/geotiff/proj_list/lambert_conic_conformal_1sp.html link]|| |
| 52 | | || || ||standard_parallel||standard_parallel_1||+lat_1|| || || |
| 53 | | || || ||longitude_of_central_meridian||central_meridian||+lon_0|| || || |
| 54 | | || || ||latitude_of_projection_origin||latitude_of_origin||+lat_0|| || || |
| 55 | | || || ||N/A||scale_factor||+k_0|| ||always 1 (3)|| |
| 56 | | || || || || || || || || |
| 57 | | ||'''LCC-2SP'''||Lambert conformal||lambert_conformal_conic||Lambert_Conformal_Conic_2SP||+proj=lcc||9802||(3) [http://www.remotesensing.org/geotiff/proj_list/lambert_conic_conformal_2sp.html link]|| |
| 58 | | || || ||standard_parallel![1]||standard_parallel_1||+lat_1|| || || |
| 59 | | || || ||standard_parallel![2]||standard_parallel_2||+lat_2|| || || |
| 60 | | || || ||longitude_of_central_meridian||central_meridian||+lon_0|| || || |
| 61 | | || || ||latitude_of_projection_origin||latitude_of_origin||+lat_0|| || || |
| 62 | | || || || || || || || || |
| 63 | | ||'''CEA'''||Lambert cylindrical equal area||lambert_cylindrical_equal_area||Cylindrical_Equal_Area||+proj=cea||9834/9835||(3)|| |
| 64 | | || || ||longitude_of_central_meridian||central_meridian||+lon_0|| || || |
| 65 | | || || ||standard_parallel![1]||standard_parallel_1||+lat_ts|| || || |
| 66 | | || || || || || || || || |
| 67 | | ||'''M-1SP'''||Mercator (1SP)||mercator||Mercator_1SP||+proj=merc||9804||(3)|| |
| 68 | | || || ||longitude_of_projection_origin||central_meridian||+lon_0|| || || |
| 69 | | || || ||scale_factor_at_projection_origin||scale_factor||+k_0|| || || |
| 70 | | || || || || || || || || |
| 71 | | ||'''M-2SP'''||Mercator (2SP)||mercator||Mercator_2SP||+proj=merc||9805||(3)|| |
| 72 | | || || ||longitude_of_projection_origin||central_meridian||+lon_0|| || || |
| 73 | | || || ||standard_parallel![1]||standard_parallel_1||+lat_1|| || || |
| 74 | | || || || || || || || || |
| 75 | | ||'''Ortho'''||Orthographic||orthographic||Orthographic||+proj=ortho||9840|| || |
| 76 | | || || ||longitude_of_projection_origin||central_meridian||+lon_0|| || || |
| 77 | | || || ||latitude_of_projection_origin||latitude_of_origin||+lat_0|| || || |
| 78 | | || || || || || || || || |
| 79 | | ||'''PS'''||Polar stereographic||polar_stereographic||Polar_Stereographic||+proj=stere||9010/9829||(3)|| |
| 80 | | || || ||standard_parallel![1]||latitude_of_origin||+lat_0|| || || |
| 81 | | || || ||straight_vertical_longitude_from_pole ||central_meridian||+lon_0|| || || |
| 82 | | || || || || || || || || |
| 83 | | ||'''St'''||Stereographic||stereographic||Stereographic||+proj=stere||9809|| || |
| 84 | | || || ||longitude_of_projection_origin||central_meridian||+lon_0|| || || |
| 85 | | || || ||latitude_of_projection_origin||latitude_of_origin||+lat_0|| || || |
| 86 | | || || ||scale_factor_at_projection_origin||scale_factor||+k_0|| || || |
| 87 | | || || || || || || || || |
| 88 | | ||'''TM'''||Transverse Mercator||transverse_mercator||Transverse_Mercator||+proj=tmerc||9807||(3)|| |
| 89 | | || || ||scale_factor_at_central_meridian||scale_factor||+k_0|| || || |
| 90 | | || || ||longitude_of_central_meridian||central_meridian||+lon_0|| || || |
| 91 | | || || ||latitude_of_projection_origin||latitude_of_origin||+lat_0|| || || |
| | 65 | ||'''Projection'''||'''Name'''||'''CF'''||'''OGC WKT'''||'''PROJ.4'''||'''EPSG name'''||'''EPSG code'''||'''GeoTIFF ID'''||'''Note'''|| |
| | 66 | || || || || || || || || || || |
| | 67 | ||'''AEA'''||Albers Equal Area||albers_conical_equal_area||Albers_Conic_Equal_Area||+proj=aea||Albers Equal Area||9822||CT_AlbersEqualArea|| || |
| | 68 | || || ||standard_parallel![1]||standard_parallel_1||+lat_1||Latitude of 1st standard parallel||8823||!StdParallel1|| || |
| | 69 | || || ||standard_parallel![2]||standard_parallel_2||+lat_2||Latitude of 2nd standard parallel||8824||!StdParallel2|| || |
| | 70 | || || ||longitude_of_central_meridian||longitude_of_center||+lon_0||Longitude of false origin||8822||!NatOriginLong|| || |
| | 71 | || || ||latitude_of_projection_origin||latitude_of_center||+lat_0||Latitude of false origin||8821||!NatOriginLat|| || |
| | 72 | ||||||false_easting||false_easting||+x_0||Easting at false origin||8826||!FalseEasting|||| |
| | 73 | ||||||false_northing||false_northing||+y_0||Northing at false origin||8827||!FalseNorthing|||| |
| | 74 | || || || || || || || || || || |
| | 75 | ||'''AE'''||Azimuthal equidistant||azimuthal_equidistant||Azimuthal_Equidistant||+proj=aeqd||N/A||||CT_AzimuthalEquidistant ||EPSG:9832 is 'Modified Azimuthal Equidistant'|| |
| | 76 | || || ||longitude_of_projection_origin||longitude_of_center||+lon_0|||| ||!ProjCenterLong|| || |
| | 77 | || || ||latitude_of_projection_origin||latitude_of_center||+lat_0|||| ||!ProjCenterLat|| || |
| | 78 | ||||||false_easting||false_easting||+x_0||||||!FalseEasting|||| |
| | 79 | ||||||false_northing||false_northing||+y_0||||||!FalseNorthing|||| |
| | 80 | || || || || || || || || || || |
| | 81 | ||'''LAEA'''||Lambert azimuthal equal area||lambert_azimuthal_equal_area||Lambert_Azimuthal_Equal_Area||+proj=laea||Lambert Azimuthal Equal Area||9820||CT_LambertAzimEqualArea || || |
| | 82 | || || ||longitude_of_projection_origin||longitude_of_center||+lon_0||Longitude of natural origin||8802||!ProjCenterLong|| || |
| | 83 | || || ||latitude_of_projection_origin||latitude_of_center||+lat_0||Latitude of natural origin||8801||!ProjCenterLat|| || |
| | 84 | ||||||false_easting||false_easting||+x_0||False easting||8806||!FalseEasting|||| |
| | 85 | ||||||false_northing||false_northing||+y_0||False northing||8807||!FalseNorthing|||| |
| | 86 | || || || || || || || || || || |
| | 87 | ||'''LCC-1SP'''||Lambert conformal||lambert_conformal_conic||Lambert_Conformal_Conic_1SP||+proj=lcc||Lambert Conic Conformal (1SP)||9801||CT_LambertConfConic_1SP||(3) [http://www.remotesensing.org/geotiff/proj_list/lambert_conic_conformal_1sp.html link]|| |
| | 88 | || || ||standard_parallel||latitude_of_origin||+lat_1||Latitude of natural origin||8801||!NatOriginLat||standard_parallel=latitude_of_projection_origin|| |
| | 89 | || || ||longitude_of_central_meridian||central_meridian||+lon_0||Longitude of natural origin||8802||!NatOriginLong|| || |
| | 90 | || || ||latitude_of_projection_origin||latitude_of_origin||+lat_0||Latitude of natural origin||8801||!NatOriginLat|| || |
| | 91 | || || ||N/A||scale_factor||+k_0||Scale factor at natural origin||8805||!ScaleAtNatOrigin||(3) always 1|| |
| | 92 | ||||||false_easting||false_easting||+x_0||False easting||8806||!FalseEasting|||| |
| | 93 | ||||||false_northing||false_northing||+y_0||False northing||8807||!FalseNorthing|||| |
| | 94 | || || || || || || || || || || |
| | 95 | ||'''LCC-2SP'''||Lambert conformal||lambert_conformal_conic||Lambert_Conformal_Conic_2SP||+proj=lcc||Lambert Conic Conformal (2SP)||9802||CT_LambertConfConic_2SP ||(3) [http://www.remotesensing.org/geotiff/proj_list/lambert_conic_conformal_2sp.html link]|| |
| | 96 | || || ||standard_parallel![1]||standard_parallel_1||+lat_1||Latitude of 1st standard parallel||8823||!StdParallel1|| || |
| | 97 | || || ||standard_parallel![2]||standard_parallel_2||+lat_2||Latitude of 2nd standard parallel||8824||!StdParallel2|| || |
| | 98 | || || ||longitude_of_central_meridian||central_meridian||+lon_0||Longitude of false origin||8822||!FalseOriginLong|| || |
| | 99 | || || ||latitude_of_projection_origin||latitude_of_origin||+lat_0||Latitude of false origin||8821||!FalseOriginLat|| || |
| | 100 | ||||||false_easting||false_easting||+x_0||Easting at false origin||8826||!FalseEasting|||| |
| | 101 | ||||||false_northing||false_northing||+y_0||Northing at false origin||8827||!FalseNorthing|||| |
| | 102 | || || || || || || || || || || |
| | 103 | ||'''CEA'''||Lambert cylindrical equal area||lambert_cylindrical_equal_area||Cylindrical_Equal_Area||+proj=cea||N/A||||CT_CylindricalEqualArea ||(3) CF says EPSG 9834/9835 ?|| |
| | 104 | || || ||longitude_of_central_meridian||central_meridian||+lon_0|||| ||!NatOriginLong|| || |
| | 105 | || || ||standard_parallel![1]||standard_parallel_1||+lat_ts||||||!StdParallel1||default to 0|| |
| | 106 | ||||||false_easting||false_easting||+x_0||||||!FalseEasting|||| |
| | 107 | ||||||false_northing||false_northing||+y_0||||||!FalseNorthing|||| |
| | 108 | || || || || || || || || || || |
| | 109 | ||'''M-1SP'''||Mercator (1SP)||mercator||Mercator_1SP||+proj=merc||Mercator (variant A)||9804||Mercator_1SP||(3)|| |
| | 110 | || || ||longitude_of_projection_origin||central_meridian||+lon_0||Longitude of natural origin||8801||!NatOriginLong|| || |
| | 111 | || || ||scale_factor_at_projection_origin||scale_factor||+k_0||Scale factor at natural origin||8805||!ScaleAtNatOrigin|| || |
| | 112 | ||||||false_easting||false_easting||+x_0||False easting||8806||!FalseEasting|||| |
| | 113 | ||||||false_northing||false_northing||+y_0||False northing||8807||!FalseNorthing|||| |
| | 114 | || || || || || || || || || || |
| | 115 | ||'''M-2SP'''||Mercator (2SP)||mercator||Mercator_2SP||+proj=merc||Mercator (variant B)||9805||N/A||(3)|| |
| | 116 | || || ||longitude_of_projection_origin||central_meridian||+lon_0||Longitude of natural origin||8801|||| || |
| | 117 | || || ||standard_parallel![1]||standard_parallel_1||+lat_ts||Latitude of 1st standard parallel||8823|||| || |
| | 118 | ||||||false_easting||false_easting||+x_0||False easting||8806||!FalseEasting|||| |
| | 119 | ||||||false_northing||false_northing||+y_0||False northing||8807||!FalseNorthing|||| |
| | 120 | || || || || || || || || || || |
| | 121 | ||'''Ortho'''||Orthographic||orthographic||Orthographic||+proj=ortho||Orthographic||9840||CT_Orthographic|| || |
| | 122 | || || ||longitude_of_projection_origin||central_meridian||+lon_0||Longitude of natural origin||8802||!ProjCenterLong|| || |
| | 123 | || || ||latitude_of_projection_origin||latitude_of_origin||+lat_0||Latitude of natural origin||8801||!ProjCenterLat|| || |
| | 124 | ||||||false_easting||false_easting||+x_0||False easting||8806||!FalseEasting|||| |
| | 125 | ||||||false_northing||false_northing||+y_0||False northing||8807||!FalseNorthing|||| |
| | 126 | || || || || || || || || || || |
| | 127 | ||'''PS-A'''||Polar stereographic||polar_stereographic||Polar_Stereographic||+proj=stere||Polar Stereographic (variant A)||9810||CT_PolarStereographic ||(3) || |
| | 128 | || || ||straight_vertical_longitude_from_pole ||central_meridian||+lon_0||Longitude of natural origin||8802||!StraightVertPoleLong|||| |
| | 129 | ||||||latitude_of_projection_origin||N/A||+lat_0||Latitude of natural origin||8801||!NatOriginLat||+90/-90|| |
| | 130 | || || ||scale_factor_at_projection_origin||scale_factor||+k_0||Scale factor at natural origin||8805||!ScaleAtNatOrigin|| || |
| | 131 | ||||||false_easting||false_easting||+x_0||False easting||8806||!FalseEasting|||| |
| | 132 | ||||||false_northing||false_northing||+y_0||False northing||8807||!FalseNorthing|||| |
| | 133 | || || || || || || || || || || |
| | 134 | ||'''PS-B'''||Polar stereographic||polar_stereographic||Polar_Stereographic||+proj=stere||Polar Stereographic (variant B)||9829||N/A||(3)|| |
| | 135 | || || ||straight_vertical_longitude_from_pole ||central_meridian||+lon_0||Longitude of natural origin||8802|||||| |
| | 136 | ||||||latitude_of_projection_origin||N/A||+lat_0||Longitude of origin||8801||||+90/-90|| |
| | 137 | ||||||standard_parallel||latitude_of_origin||+lat_ts||Latitude of standard parallel||8832|||||| |
| | 138 | ||||||false_easting||false_easting||+x_0||False easting||8806||!FalseEasting|||| |
| | 139 | ||||||false_northing||false_northing||+y_0||False northing||8807||!FalseNorthing|||| |
| | 140 | || || || || || || || || || || |
| | 141 | ||'''St'''||Stereographic||stereographic||Stereographic||+proj=stere||N/A||||CT_Stereographic||EPSG 9809 is “Oblique Stereographic” or “Double Stereographic”|| |
| | 142 | || || ||longitude_of_projection_origin||central_meridian||+lon_0|||| ||!ProjCenterLong|| || |
| | 143 | || || ||latitude_of_projection_origin||latitude_of_origin||+lat_0|||| ||!ProjCenterLat|| || |
| | 144 | || || ||scale_factor_at_projection_origin||scale_factor||+k_0|||| ||!ScaleAtNatOrigin|| || |
| | 145 | ||||||false_easting||false_easting||+x_0||||||!FalseEasting|||| |
| | 146 | ||||||false_northing||false_northing||+y_0||||||!FalseNorthing|||| |
| | 147 | || || || || || || || || || || |
| | 148 | ||'''TM'''||Transverse Mercator||transverse_mercator||Transverse_Mercator||+proj=tmerc||Transverse Mercator||9807||CT_TransverseMercator||(3)|| |
| | 149 | || || ||scale_factor_at_central_meridian||scale_factor||+k_0||Scale factor at natural origin||8805||!ScaleAtNatOrigin|| || |
| | 150 | || || ||longitude_of_central_meridian||central_meridian||+lon_0||Longitude of natural origin||8802||!NatOriginLong|| || |
| | 151 | || || ||latitude_of_projection_origin||latitude_of_origin||+lat_0||Latitude of natural origin||8801||!NatOriginLat|| || |
| | 152 | ||||||false_easting||false_easting||+x_0||False easting||8806||!FalseEasting|||| |
| | 153 | ||||||false_northing||false_northing||+y_0||False northing||8807||!FalseNorthing|||| |
