IGNF:TROM56MD - TROMELIN SGM 1956 MERCATOR DIRECTE

{
  "$schema": "https://proj.org/schemas/v0.7/projjson.schema.json",
  "type": "ProjectedCRS",
  "name": "TROMELIN SGM 1956 MERCATOR DIRECTE",
  "base_crs": {
    "name": "Tromelin geographiques (dms)",
    "datum": {
      "type": "GeodeticReferenceFrame",
      "name": "TROMELIN (SGM 1956)",
      "ellipsoid": {
        "name": "International 1924",
        "semi_major_axis": 6378388,
        "inverse_flattening": 297
      }
    },
    "coordinate_system": {
      "subtype": "ellipsoidal",
      "axis": [
        {
          "name": "Geodetic longitude",
          "abbreviation": "Lon",
          "direction": "east",
          "unit": "degree"
        },
        {
          "name": "Geodetic latitude",
          "abbreviation": "Lat",
          "direction": "north",
          "unit": "degree"
        }
      ]
    },
    "id": {
      "authority": "IGNF",
      "code": "TROM56G"
    }
  },
  "conversion": {
    "name": "MERCATOR DIRECTE",
    "method": {
      "name": "Mercator (variant A)",
      "id": {
        "authority": "EPSG",
        "code": 9804
      }
    },
    "parameters": [
      {
        "name": "Latitude of natural origin",
        "value": 0,
        "unit": "degree",
        "id": {
          "authority": "EPSG",
          "code": 8801
        }
      },
      {
        "name": "Longitude of natural origin",
        "value": 0,
        "unit": "degree",
        "id": {
          "authority": "EPSG",
          "code": 8802
        }
      },
      {
        "name": "Scale factor at natural origin",
        "value": 1,
        "unit": "unity",
        "id": {
          "authority": "EPSG",
          "code": 8805
        }
      },
      {
        "name": "False easting",
        "value": 20000000,
        "unit": "metre",
        "id": {
          "authority": "EPSG",
          "code": 8806
        }
      },
      {
        "name": "False northing",
        "value": 10000000,
        "unit": "metre",
        "id": {
          "authority": "EPSG",
          "code": 8807
        }
      }
    ]
  },
  "coordinate_system": {
    "subtype": "Cartesian",
    "axis": [
      {
        "name": "Easting",
        "abbreviation": "X",
        "direction": "east",
        "unit": "metre"
      },
      {
        "name": "Northing",
        "abbreviation": "Y",
        "direction": "north",
        "unit": "metre"
      }
    ]
  },
  "scope": "LOCALE, HISTORIQUE",
  "area": "ILE TROMELIN - MERCATOR DIRECTE",
  "bbox": {
    "south_latitude": -15.9,
    "west_longitude": 54.51,
    "north_latitude": -15.87,
    "east_longitude": 54.53
  },
  "id": {
    "authority": "IGNF",
    "code": "TROM56MD"
  }
}

{'crs_wkt': 'PROJCRS["TROMELIN SGM 1956 MERCATOR '
            'DIRECTE",BASEGEOGCRS["Tromelin geographiques '
            '(dms)",DATUM["TROMELIN (SGM 1956)",ELLIPSOID["International '
            '1924",6378388,297,LENGTHUNIT["metre",1]]],PRIMEM["Greenwich",0,ANGLEUNIT["degree",0.0174532925199433]],ID["IGNF","TROM56G"]],CONVERSION["MERCATOR '
            'DIRECTE",METHOD["Mercator (variant '
            'A)",ID["EPSG",9804]],PARAMETER["Latitude of natural '
            'origin",0,ANGLEUNIT["degree",0.0174532925199433],ID["EPSG",8801]],PARAMETER["Longitude '
            'of natural '
            'origin",0,ANGLEUNIT["degree",0.0174532925199433],ID["EPSG",8802]],PARAMETER["Scale '
            'factor at natural '
            'origin",1,SCALEUNIT["unity",1],ID["EPSG",8805]],PARAMETER["False '
            'easting",20000000,LENGTHUNIT["metre",1],ID["EPSG",8806]],PARAMETER["False '
            'northing",10000000,LENGTHUNIT["metre",1],ID["EPSG",8807]]],CS[Cartesian,2],AXIS["easting '
            '(X)",east,ORDER[1],LENGTHUNIT["metre",1]],AXIS["northing '
            '(Y)",north,ORDER[2],LENGTHUNIT["metre",1]],USAGE[SCOPE["LOCALE, '
            'HISTORIQUE"],AREA["ILE TROMELIN - MERCATOR '
            'DIRECTE"],BBOX[-15.9,54.51,-15.87,54.53]],ID["IGNF","TROM56MD"]]',
 'false_easting': 20000000.0,
 'false_northing': 10000000.0,
 'geographic_crs_name': 'Tromelin geographiques (dms)',
 'grid_mapping_name': 'mercator',
 'horizontal_datum_name': 'TROMELIN (SGM 1956)',
 'inverse_flattening': 297.0,
 'longitude_of_prime_meridian': 0.0,
 'longitude_of_projection_origin': 0.0,
 'prime_meridian_name': 'Greenwich',
 'projected_crs_name': 'TROMELIN SGM 1956 MERCATOR DIRECTE',
 'reference_ellipsoid_name': 'International 1924',
 'scale_factor_at_projection_origin': 1.0,
 'semi_major_axis': 6378388.0,
 'semi_minor_axis': 6356911.9461279465,
 'standard_parallel': 0.0}