EPSG:5624 - NAD27 / Michigan Old Central

{
  "$schema": "https://proj.org/schemas/v0.7/projjson.schema.json",
  "type": "ProjectedCRS",
  "name": "NAD27 / Michigan Old Central",
  "base_crs": {
    "name": "NAD27",
    "datum": {
      "type": "GeodeticReferenceFrame",
      "name": "North American Datum 1927",
      "ellipsoid": {
        "name": "Clarke 1866",
        "semi_major_axis": 6378206.4,
        "semi_minor_axis": 6356583.8
      }
    },
    "coordinate_system": {
      "subtype": "ellipsoidal",
      "axis": [
        {
          "name": "Geodetic latitude",
          "abbreviation": "Lat",
          "direction": "north",
          "unit": "degree"
        },
        {
          "name": "Geodetic longitude",
          "abbreviation": "Lon",
          "direction": "east",
          "unit": "degree"
        }
      ]
    },
    "id": {
      "authority": "EPSG",
      "code": 4267
    }
  },
  "conversion": {
    "name": "Michigan State Plane Old Central zone",
    "method": {
      "name": "Transverse Mercator",
      "id": {
        "authority": "EPSG",
        "code": 9807
      }
    },
    "parameters": [
      {
        "name": "Latitude of natural origin",
        "value": 41.5,
        "unit": "degree",
        "id": {
          "authority": "EPSG",
          "code": 8801
        }
      },
      {
        "name": "Longitude of natural origin",
        "value": -85.75,
        "unit": "degree",
        "id": {
          "authority": "EPSG",
          "code": 8802
        }
      },
      {
        "name": "Scale factor at natural origin",
        "value": 0.999909091,
        "unit": "unity",
        "id": {
          "authority": "EPSG",
          "code": 8805
        }
      },
      {
        "name": "False easting",
        "value": 500000,
        "unit": {
          "type": "LinearUnit",
          "name": "US survey foot",
          "conversion_factor": 0.304800609601219
        },
        "id": {
          "authority": "EPSG",
          "code": 8806
        }
      },
      {
        "name": "False northing",
        "value": 0,
        "unit": {
          "type": "LinearUnit",
          "name": "US survey foot",
          "conversion_factor": 0.304800609601219
        },
        "id": {
          "authority": "EPSG",
          "code": 8807
        }
      }
    ]
  },
  "coordinate_system": {
    "subtype": "Cartesian",
    "axis": [
      {
        "name": "Easting",
        "abbreviation": "X",
        "direction": "east",
        "unit": {
          "type": "LinearUnit",
          "name": "US survey foot",
          "conversion_factor": 0.304800609601219
        }
      },
      {
        "name": "Northing",
        "abbreviation": "Y",
        "direction": "north",
        "unit": {
          "type": "LinearUnit",
          "name": "US survey foot",
          "conversion_factor": 0.304800609601219
        }
      }
    ]
  },
  "scope": "Engineering survey, topographic mapping.",
  "area": "United States (USA) - Michigan - counties of Alger; Allegan; Antrim; Barry; Benzie; Berrien; Branch; Calhoun; Cass; Charlevoix; Clare; Delta; Eaton; Emmet; Grand Traverse; Ionia; Isabella; Kalamazoo; Kalkaska; Kent; Lake; Leelanau; Luce; Mackinac; Manistee; Mason; Mecosta; Missaukee; Montcalm; Muskegon; Newaygo; Oceana; Osceola; Ottawa; St Joseph; Schoolcraft; Van Buren; Wexford.",
  "bbox": {
    "south_latitude": 41.75,
    "west_longitude": -87.61,
    "north_latitude": 46.11,
    "east_longitude": -84.6
  },
  "id": {
    "authority": "EPSG",
    "code": 5624
  }
}

{'crs_wkt': 'PROJCRS["NAD27 / Michigan Old '
            'Central",BASEGEOGCRS["NAD27",DATUM["North American Datum '
            '1927",ELLIPSOID["Clarke '
            '1866",6378206.4,294.978698213898,LENGTHUNIT["metre",1]]],PRIMEM["Greenwich",0,ANGLEUNIT["degree",0.0174532925199433]],ID["EPSG",4267]],CONVERSION["Michigan '
            'State Plane Old Central zone",METHOD["Transverse '
            'Mercator",ID["EPSG",9807]],PARAMETER["Latitude of natural '
            'origin",41.5,ANGLEUNIT["degree",0.0174532925199433],ID["EPSG",8801]],PARAMETER["Longitude '
            'of natural '
            'origin",-85.75,ANGLEUNIT["degree",0.0174532925199433],ID["EPSG",8802]],PARAMETER["Scale '
            'factor at natural '
            'origin",0.999909091,SCALEUNIT["unity",1],ID["EPSG",8805]],PARAMETER["False '
            'easting",500000,LENGTHUNIT["US survey '
            'foot",0.304800609601219],ID["EPSG",8806]],PARAMETER["False '
            'northing",0,LENGTHUNIT["US survey '
            'foot",0.304800609601219],ID["EPSG",8807]]],CS[Cartesian,2],AXIS["easting '
            '(X)",east,ORDER[1],LENGTHUNIT["US survey '
            'foot",0.304800609601219]],AXIS["northing '
            '(Y)",north,ORDER[2],LENGTHUNIT["US survey '
            'foot",0.304800609601219]],USAGE[SCOPE["Engineering survey, '
            'topographic mapping."],AREA["United States (USA) - Michigan - '
            'counties of Alger; Allegan; Antrim; Barry; Benzie; Berrien; '
            'Branch; Calhoun; Cass; Charlevoix; Clare; Delta; Eaton; Emmet; '
            'Grand Traverse; Ionia; Isabella; Kalamazoo; Kalkaska; Kent; Lake; '
            'Leelanau; Luce; Mackinac; Manistee; Mason; Mecosta; Missaukee; '
            'Montcalm; Muskegon; Newaygo; Oceana; Osceola; Ottawa; St Joseph; '
            'Schoolcraft; Van Buren; '
            'Wexford."],BBOX[41.75,-87.61,46.11,-84.6]],ID["EPSG",5624]]',
 'false_easting': 500000.0,
 'false_northing': 0.0,
 'geographic_crs_name': 'NAD27',
 'grid_mapping_name': 'transverse_mercator',
 'horizontal_datum_name': 'North American Datum 1927',
 'inverse_flattening': 294.9786982138982,
 'latitude_of_projection_origin': 41.5,
 'longitude_of_central_meridian': -85.75,
 'longitude_of_prime_meridian': 0.0,
 'prime_meridian_name': 'Greenwich',
 'projected_crs_name': 'NAD27 / Michigan Old Central',
 'reference_ellipsoid_name': 'Clarke 1866',
 'scale_factor_at_central_meridian': 0.999909091,
 'semi_major_axis': 6378206.4,
 'semi_minor_axis': 6356583.8}