EPSG:29700 - Tananarive (Paris) / Laborde Grid

Attributes

Unit

metre

Scope

Engineering survey, topographic mapping.

Remarks

None

Area of use

Madagascar - onshore.

Data Source: EPSG v11.016 2024-08-31

Datum: Tananarive 1925 (Paris)

Coordinate System: cartesian

Projection: Laborde Grid approximation

Geodetic CRS: Tananarive (Paris)

Export

PROJCRS["Tananarive (Paris) / Laborde Grid",
    BASEGEOGCRS["Tananarive (Paris)",
        DATUM["Tananarive 1925 (Paris)",
            ELLIPSOID["International 1924",6378388,297,
                LENGTHUNIT["metre",1]]],
        PRIMEM["Paris",2.5969213,
            ANGLEUNIT["grad",0.0157079632679489]],
        ID["EPSG",4810]],
    CONVERSION["Laborde Grid approximation",
        METHOD["Hotine Oblique Mercator (variant B)",
            ID["EPSG",9815]],
        PARAMETER["Latitude of projection centre",-21,
            ANGLEUNIT["grad",0.0157079632679489],
            ID["EPSG",8811]],
        PARAMETER["Longitude of projection centre",49,
            ANGLEUNIT["grad",0.0157079632679489],
            ID["EPSG",8812]],
        PARAMETER["Azimuth at projection centre",21,
            ANGLEUNIT["grad",0.0157079632679489],
            ID["EPSG",8813]],
        PARAMETER["Angle from Rectified to Skew Grid",21,
            ANGLEUNIT["grad",0.0157079632679489],
            ID["EPSG",8814]],
        PARAMETER["Scale factor at projection centre",0.9995,
            SCALEUNIT["unity",1],
            ID["EPSG",8815]],
        PARAMETER["Easting at projection centre",400000,
            LENGTHUNIT["metre",1],
            ID["EPSG",8816]],
        PARAMETER["Northing at projection centre",800000,
            LENGTHUNIT["metre",1],
            ID["EPSG",8817]]],
    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["Madagascar - onshore."],
        BBOX[-25.64,43.18,-11.89,50.56]],
    ID["EPSG",29700]]
{
  "$schema": "https://proj.org/schemas/v0.7/projjson.schema.json",
  "type": "ProjectedCRS",
  "name": "Tananarive (Paris) / Laborde Grid",
  "base_crs": {
    "name": "Tananarive (Paris)",
    "datum": {
      "type": "GeodeticReferenceFrame",
      "name": "Tananarive 1925 (Paris)",
      "ellipsoid": {
        "name": "International 1924",
        "semi_major_axis": 6378388,
        "inverse_flattening": 297
      },
      "prime_meridian": {
        "name": "Paris",
        "longitude": {
          "value": 2.5969213,
          "unit": {
            "type": "AngularUnit",
            "name": "grad",
            "conversion_factor": 0.0157079632679489
          }
        }
      }
    },
    "coordinate_system": {
      "subtype": "ellipsoidal",
      "axis": [
        {
          "name": "Geodetic latitude",
          "abbreviation": "Lat",
          "direction": "north",
          "unit": {
            "type": "AngularUnit",
            "name": "grad",
            "conversion_factor": 0.0157079632679489
          }
        },
        {
          "name": "Geodetic longitude",
          "abbreviation": "Lon",
          "direction": "east",
          "unit": {
            "type": "AngularUnit",
            "name": "grad",
            "conversion_factor": 0.0157079632679489
          }
        }
      ]
    },
    "id": {
      "authority": "EPSG",
      "code": 4810
    }
  },
  "conversion": {
    "name": "Laborde Grid approximation",
    "method": {
      "name": "Hotine Oblique Mercator (variant B)",
      "id": {
        "authority": "EPSG",
        "code": 9815
      }
    },
    "parameters": [
      {
        "name": "Latitude of projection centre",
        "value": -21,
        "unit": {
          "type": "AngularUnit",
          "name": "grad",
          "conversion_factor": 0.0157079632679489
        },
        "id": {
          "authority": "EPSG",
          "code": 8811
        }
      },
      {
        "name": "Longitude of projection centre",
        "value": 49,
        "unit": {
          "type": "AngularUnit",
          "name": "grad",
          "conversion_factor": 0.0157079632679489
        },
        "id": {
          "authority": "EPSG",
          "code": 8812
        }
      },
      {
        "name": "Azimuth at projection centre",
        "value": 21,
        "unit": {
          "type": "AngularUnit",
          "name": "grad",
          "conversion_factor": 0.0157079632679489
        },
        "id": {
          "authority": "EPSG",
          "code": 8813
        }
      },
      {
        "name": "Angle from Rectified to Skew Grid",
        "value": 21,
        "unit": {
          "type": "AngularUnit",
          "name": "grad",
          "conversion_factor": 0.0157079632679489
        },
        "id": {
          "authority": "EPSG",
          "code": 8814
        }
      },
      {
        "name": "Scale factor at projection centre",
        "value": 0.9995,
        "unit": "unity",
        "id": {
          "authority": "EPSG",
          "code": 8815
        }
      },
      {
        "name": "Easting at projection centre",
        "value": 400000,
        "unit": "metre",
        "id": {
          "authority": "EPSG",
          "code": 8816
        }
      },
      {
        "name": "Northing at projection centre",
        "value": 800000,
        "unit": "metre",
        "id": {
          "authority": "EPSG",
          "code": 8817
        }
      }
    ]
  },
  "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": "Madagascar - onshore.",
  "bbox": {
    "south_latitude": -25.64,
    "west_longitude": 43.18,
    "north_latitude": -11.89,
    "east_longitude": 50.56
  },
  "id": {
    "authority": "EPSG",
    "code": 29700
  }
}
{'azimuth_of_central_line': 21.0,
 'crs_wkt': 'PROJCRS["Tananarive (Paris) / Laborde '
            'Grid",BASEGEOGCRS["Tananarive (Paris)",DATUM["Tananarive 1925 '
            '(Paris)",ELLIPSOID["International '
            '1924",6378388,297,LENGTHUNIT["metre",1]]],PRIMEM["Paris",2.5969213,ANGLEUNIT["grad",0.0157079632679489]],ID["EPSG",4810]],CONVERSION["Laborde '
            'Grid approximation",METHOD["Hotine Oblique Mercator (variant '
            'B)",ID["EPSG",9815]],PARAMETER["Latitude of projection '
            'centre",-21,ANGLEUNIT["grad",0.0157079632679489],ID["EPSG",8811]],PARAMETER["Longitude '
            'of projection '
            'centre",49,ANGLEUNIT["grad",0.0157079632679489],ID["EPSG",8812]],PARAMETER["Azimuth '
            'at projection '
            'centre",21,ANGLEUNIT["grad",0.0157079632679489],ID["EPSG",8813]],PARAMETER["Angle '
            'from Rectified to Skew '
            'Grid",21,ANGLEUNIT["grad",0.0157079632679489],ID["EPSG",8814]],PARAMETER["Scale '
            'factor at projection '
            'centre",0.9995,SCALEUNIT["unity",1],ID["EPSG",8815]],PARAMETER["Easting '
            'at projection '
            'centre",400000,LENGTHUNIT["metre",1],ID["EPSG",8816]],PARAMETER["Northing '
            'at projection '
            'centre",800000,LENGTHUNIT["metre",1],ID["EPSG",8817]]],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["Madagascar - '
            'onshore."],BBOX[-25.64,43.18,-11.89,50.56]],ID["EPSG",29700]]',
 'false_easting': 400000.0,
 'false_northing': 800000.0,
 'geographic_crs_name': 'Tananarive (Paris)',
 'grid_mapping_name': 'oblique_mercator',
 'horizontal_datum_name': 'Tananarive 1925 (Paris)',
 'inverse_flattening': 297.0,
 'latitude_of_projection_origin': -21.0,
 'longitude_of_prime_meridian': 2.5969213,
 'longitude_of_projection_origin': 49.0,
 'prime_meridian_name': 'Paris',
 'projected_crs_name': 'Tananarive (Paris) / Laborde Grid',
 'reference_ellipsoid_name': 'International 1924',
 'scale_factor_at_projection_origin': 0.9995,
 'semi_major_axis': 6378388.0,
 'semi_minor_axis': 6356911.9461279465}