EPSG:21100 - Batavia (Jakarta) / NEIEZ

{
  "$schema": "https://proj.org/schemas/v0.7/projjson.schema.json",
  "type": "ProjectedCRS",
  "name": "Batavia (Jakarta) / NEIEZ",
  "base_crs": {
    "name": "Batavia (Jakarta)",
    "datum": {
      "type": "GeodeticReferenceFrame",
      "name": "Batavia (Jakarta)",
      "ellipsoid": {
        "name": "Bessel 1841",
        "semi_major_axis": 6377397.155,
        "inverse_flattening": 299.1528128
      },
      "prime_meridian": {
        "name": "Jakarta",
        "longitude": 106.807719444444
      }
    },
    "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": 4813
    }
  },
  "conversion": {
    "name": "Netherlands East Indies Equatorial Zone",
    "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": 110,
        "unit": "degree",
        "id": {
          "authority": "EPSG",
          "code": 8802
        }
      },
      {
        "name": "Scale factor at natural origin",
        "value": 0.997,
        "unit": "unity",
        "id": {
          "authority": "EPSG",
          "code": 8805
        }
      },
      {
        "name": "False easting",
        "value": 3900000,
        "unit": "metre",
        "id": {
          "authority": "EPSG",
          "code": 8806
        }
      },
      {
        "name": "False northing",
        "value": 900000,
        "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": "Engineering survey, topographic mapping.",
  "area": "Indonesia - onshore - Bali, Java and western Sumatra.",
  "bbox": {
    "south_latitude": -8.91,
    "west_longitude": 95.16,
    "north_latitude": 5.97,
    "east_longitude": 115.77
  },
  "id": {
    "authority": "EPSG",
    "code": 21100
  }
}

{'crs_wkt': 'PROJCRS["Batavia (Jakarta) / NEIEZ",BASEGEOGCRS["Batavia '
            '(Jakarta)",DATUM["Batavia (Jakarta)",ELLIPSOID["Bessel '
            '1841",6377397.155,299.1528128,LENGTHUNIT["metre",1]]],PRIMEM["Jakarta",106.807719444444,ANGLEUNIT["degree",0.0174532925199433]],ID["EPSG",4813]],CONVERSION["Netherlands '
            'East Indies Equatorial Zone",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",110,ANGLEUNIT["degree",0.0174532925199433],ID["EPSG",8802]],PARAMETER["Scale '
            'factor at natural '
            'origin",0.997,SCALEUNIT["unity",1],ID["EPSG",8805]],PARAMETER["False '
            'easting",3900000,LENGTHUNIT["metre",1],ID["EPSG",8806]],PARAMETER["False '
            'northing",900000,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["Engineering '
            'survey, topographic mapping."],AREA["Indonesia - onshore - Bali, '
            'Java and western '
            'Sumatra."],BBOX[-8.91,95.16,5.97,115.77]],ID["EPSG",21100]]',
 'false_easting': 3900000.0,
 'false_northing': 900000.0,
 'geographic_crs_name': 'Batavia (Jakarta)',
 'grid_mapping_name': 'mercator',
 'horizontal_datum_name': 'Batavia (Jakarta)',
 'inverse_flattening': 299.1528128,
 'longitude_of_prime_meridian': 106.80771944444444,
 'longitude_of_projection_origin': 110.0,
 'prime_meridian_name': 'Jakarta',
 'projected_crs_name': 'Batavia (Jakarta) / NEIEZ',
 'reference_ellipsoid_name': 'Bessel 1841',
 'scale_factor_at_projection_origin': 0.997,
 'semi_major_axis': 6377397.155,
 'semi_minor_axis': 6356078.962818189,
 'standard_parallel': 0.0}