EPSG:4705

Mhast (offshore)

Available transformations
to EPSG:4326
EPSG:4326 - WGS 84

  • Angola (Cabinda) , accuracy 11.0 m, code 8656 (default)

Selected transformation

Name: Mhast (offshore) to WGS 84 (1)

Remarks: Derived via WGS 72BE. Can be implemented as a single position vector transformation with parameter vaues of dX = -255.0 m, dY = -29.0 m, dZ = -103.1 m, rX = rY = 0 sec, rZ = 0.814 sec, dS = -0.38 ppm.

Information source: OGP

Revision date: 2025-03-16

Attributes

Unit: degree (supplier to define representation)

Geodetic CRS: Mhast (offshore)

Datum: Mhast (offshore)

Ellipsoid: International 1924

Prime meridian: Greenwich

Data source: EPSG

Information source: ChevronTexaco.

Revision date: 2006-01-06

Scope: Oil and gas exploration and production.

Remarks: Used by CABGOC. Differs from Mhast (onshore) by approximately 10m. Replaced by Malongo 1987 (CRS code 4259) in 1987.

Area of use: Angola (Cabinda) - offshore; The Democratic Republic of the Congo (Zaire) - offshore.

Coordinate system: Ellipsoidal 2D CS. Axes: latitude, longitude. Orientations: north, east. UoM: degree

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Center coordinates
11.45 -5.54

WGS84 bounds:
10.53 -6.04
12.37 -5.05

Angola (Cabinda) - offshore; The Democratic Republic of the Congo (Zaire) - offshore.
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Definition: OGC Well Known Text 2 (2019)

BOUNDCRS[
    SOURCECRS[
        GEOGCRS["Mhast (offshore)",
            DATUM["Mhast (offshore)",
                ELLIPSOID["International 1924",6378388,297,
                    LENGTHUNIT["metre",1]]],
            PRIMEM["Greenwich",0,
                ANGLEUNIT["degree",0.0174532925199433]],
            CS[ellipsoidal,2],
                AXIS["geodetic latitude (Lat)",north,
                    ORDER[1],
                    ANGLEUNIT["degree",0.0174532925199433]],
                AXIS["geodetic longitude (Lon)",east,
                    ORDER[2],
                    ANGLEUNIT["degree",0.0174532925199433]],
            ID["EPSG",4705]]],
    TARGETCRS[
        GEOGCRS["WGS 72BE",
            DYNAMIC[
                FRAMEEPOCH[1972]],
            DATUM["WGS 72 Transit Broadcast Ephemeris",
                ELLIPSOID["WGS 72",6378135,298.26,
                    LENGTHUNIT["metre",1]]],
            PRIMEM["Greenwich",0,
                ANGLEUNIT["degree",0.0174532925199433]],
            CS[ellipsoidal,2],
                AXIS["geodetic latitude (Lat)",north,
                    ORDER[1],
                    ANGLEUNIT["degree",0.0174532925199433]],
                AXIS["geodetic longitude (Lon)",east,
                    ORDER[2],
                    ANGLEUNIT["degree",0.0174532925199433]],
            ID["EPSG",4324]]],
    ABRIDGEDTRANSFORMATION["Mhast (offshore) to WGS 72BE (1)",
        METHOD["Geocentric translations (geog2D domain)",
            ID["EPSG",9603]],
        PARAMETER["X-axis translation",-255,
            ID["EPSG",8605]],
        PARAMETER["Y-axis translation",-29,
            ID["EPSG",8606]],
        PARAMETER["Z-axis translation",-105,
            ID["EPSG",8607]],
        ID["EPSG",15790]]]

Definition: PROJ.4

+proj=longlat +ellps=intl +towgs84=0,0,1.9,0,0,0.814,-0.38 +no_defs +type=crs

Definition: JavaScript (Proj4js) 

proj4.defs("EPSG:4705","+proj=longlat +ellps=intl +towgs84=0,0,1.9,0,0,0.814,-0.38 +no_defs +type=crs");

Definition: JSON

{
    "$schema": "https://proj.org/schemas/v0.7/projjson.schema.json",
    "type": "BoundCRS",
    "source_crs": {
        "type": "GeographicCRS",
        "name": "Mhast (offshore)",
        "datum": {
            "type": "GeodeticReferenceFrame",
            "name": "Mhast (offshore)",
            "ellipsoid": {
                "name": "International 1924",
                "semi_major_axis": 6378388,
                "inverse_flattening": 297
            }
        },
        "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": 4705
        }
    },
    "target_crs": {
        "type": "GeographicCRS",
        "name": "WGS 72BE",
        "datum": {
            "type": "DynamicGeodeticReferenceFrame",
            "name": "WGS 72 Transit Broadcast Ephemeris",
            "frame_reference_epoch": 1972,
            "ellipsoid": {
                "name": "WGS 72",
                "semi_major_axis": 6378135,
                "inverse_flattening": 298.26
            }
        },
        "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": 4324
        }
    },
    "transformation": {
        "name": "Mhast (offshore) to WGS 72BE (1)",
        "method": {
            "name": "Geocentric translations (geog2D domain)",
            "id": {
                "authority": "EPSG",
                "code": 9603
            }
        },
        "parameters": [
            {
                "name": "X-axis translation",
                "value": -255,
                "unit": "metre",
                "id": {
                    "authority": "EPSG",
                    "code": 8605
                }
            },
            {
                "name": "Y-axis translation",
                "value": -29,
                "unit": "metre",
                "id": {
                    "authority": "EPSG",
                    "code": 8606
                }
            },
            {
                "name": "Z-axis translation",
                "value": -105,
                "unit": "metre",
                "id": {
                    "authority": "EPSG",
                    "code": 8607
                }
            }
        ],
        "id": {
            "authority": "EPSG",
            "code": 15790
        }
    }
}

Definition: MapServer - MAPfile

PROJECTION
	"proj=longlat"
	"ellps=intl"
	"towgs84=0,0,1.9,0,0,0.814,-0.38"
	"no_defs"
	"type=crs"
END

Definition: Mapnik

<?xml version="1.0" encoding="utf-8"?>
<Map srs="+proj=longlat +ellps=intl +towgs84=0,0,1.9,0,0,0.814,-0.38 +no_defs +type=crs">
	<Layer srs="+proj=longlat +ellps=intl +towgs84=0,0,1.9,0,0,0.814,-0.38 +no_defs +type=crs">
	</Layer>
</Map>