EPSG:29871

Timbalai 1948 / RSO Borneo (ch)

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

Selected transformation

Method: Geocentric translations (geog2D domain)

Remarks: Derived at 8 stations. Accuracy 10m, 10m and 12m in X, Y and Z axes.

Information source: U.S. Defense Mapping Agency TR8350.2 September 1987.

Revision date: 2020-03-14

Attributes

Unit: British chain (Sears 1922)

Geodetic CRS: Timbalai 1948

Datum: Timbalai 1948

Ellipsoid: Everest 1830 (1967 Definition)

Prime meridian: Greenwich

Data source: EPSG

Information source: Defence Geographic Centre.

Revision date: 2022-11-29

Scope: Engineering survey, topographic mapping.

Remarks: Adopts ellipsoid metric conversion of 39.370147 inches per metre. Replaced by metric projection version (CRS code 29873). See also foot version (CRS code 29872) for Shell ops in E Malaysia.

Area of use: Brunei - onshore and offshore; Malaysia - East Malaysia (Sabah; Sarawak) - onshore and offshore.

Coordinate system: Cartesian 2D CS. Axes: easting, northing (E,N). Orientations: east, north. UoM: chSe.

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Center coordinates
26351.72 23438.83

Projected bounds:
-2098.15 4674.78
54952.67 42363.35

WGS84 bounds:
109.31 0.85
119.61 7.67

Brunei - onshore and offshore; Malaysia - East Malaysia (Sabah; Sarawak) - onshore and offshore.
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Definition: OGC Well Known Text

PROJCS["Timbalai 1948 / RSO Borneo (ch)",
    GEOGCS["Timbalai 1948",
        DATUM["Timbalai_1948",
            SPHEROID["Everest 1830 (1967 Definition)",6377298.556,300.8017],
            TOWGS84[-679,669,-48,0,0,0,0]],
        PRIMEM["Greenwich",0,
            AUTHORITY["EPSG","8901"]],
        UNIT["degree",0.0174532925199433,
            AUTHORITY["EPSG","9122"]],
        AUTHORITY["EPSG","4298"]],
    PROJECTION["Hotine_Oblique_Mercator_Azimuth_Center"],
    PARAMETER["latitude_of_center",4],
    PARAMETER["longitude_of_center",115],
    PARAMETER["azimuth",53.3158204722222],
    PARAMETER["rectified_grid_angle",53.1301023611111],
    PARAMETER["scale_factor",0.99984],
    PARAMETER["false_easting",29352.4763],
    PARAMETER["false_northing",22014.3572],
    UNIT["British chain (Sears 1922)",20.1167651215526],
    AXIS["Easting",EAST],
    AXIS["Northing",NORTH],
    AUTHORITY["EPSG","29871"]]

Definition: OGC Well Known Text 2 (2019)

PROJCRS["Timbalai 1948 / RSO Borneo (ch)",
    BASEGEOGCRS["Timbalai 1948",
        DATUM["Timbalai 1948",
            ELLIPSOID["Everest 1830 (1967 Definition)",6377298.556,300.8017,
                LENGTHUNIT["metre",1]]],
        PRIMEM["Greenwich",0,
            ANGLEUNIT["degree",0.0174532925199433]],
        ID["EPSG",4298]],
    CONVERSION["Rectified Skew Orthomorphic Borneo Grid (chain)",
        METHOD["Hotine Oblique Mercator (variant B)",
            ID["EPSG",9815]],
        PARAMETER["Latitude of projection centre",4,
            ANGLEUNIT["degree",0.0174532925199433],
            ID["EPSG",8811]],
        PARAMETER["Longitude of projection centre",115,
            ANGLEUNIT["degree",0.0174532925199433],
            ID["EPSG",8812]],
        PARAMETER["Azimuth of initial line",53.3158204722222,
            ANGLEUNIT["degree",0.0174532925199433],
            ID["EPSG",8813]],
        PARAMETER["Angle from Rectified to Skew Grid",53.1301023611111,
            ANGLEUNIT["degree",0.0174532925199433],
            ID["EPSG",8814]],
        PARAMETER["Scale factor on initial line",0.99984,
            SCALEUNIT["unity",1],
            ID["EPSG",8815]],
        PARAMETER["Easting at projection centre",29352.4763,
            LENGTHUNIT["British chain (Sears 1922)",20.1167651215526],
            ID["EPSG",8816]],
        PARAMETER["Northing at projection centre",22014.3572,
            LENGTHUNIT["British chain (Sears 1922)",20.1167651215526],
            ID["EPSG",8817]]],
    CS[Cartesian,2],
        AXIS["(E)",east,
            ORDER[1],
            LENGTHUNIT["British chain (Sears 1922)",20.1167651215526]],
        AXIS["(N)",north,
            ORDER[2],
            LENGTHUNIT["British chain (Sears 1922)",20.1167651215526]],
    USAGE[
        SCOPE["Engineering survey, topographic mapping."],
        AREA["Brunei - onshore and offshore; Malaysia - East Malaysia (Sabah; Sarawak) - onshore and offshore."],
        BBOX[0.85,109.31,7.67,119.61]],
    ID["EPSG",29871]]

Definition: ESRI Well Known Text

PROJCS["Timbalai_1948_RSO_Borneo_Chains",
    GEOGCS["GCS_Timbalai_1948",
        DATUM["D_Timbalai_1948",
            SPHEROID["Everest_Definition_1967",6377298.556,300.8017]],
        PRIMEM["Greenwich",0.0],
        UNIT["Degree",0.0174532925199433]],
    PROJECTION["Rectified_Skew_Orthomorphic_Center"],
    PARAMETER["False_Easting",29352.4763],
    PARAMETER["False_Northing",22014.3572],
    PARAMETER["Scale_Factor",0.99984],
    PARAMETER["Azimuth",53.3158204722222],
    PARAMETER["Longitude_Of_Center",115.0],
    PARAMETER["Latitude_Of_Center",4.0],
    PARAMETER["XY_Plane_Rotation",53.1301023611111],
    UNIT["British chain (Sears 1922)",20.1167651215526]]

Definition: PROJ.4

+proj=omerc +lat_0=4 +lonc=115 +alpha=53.3158204722222 +gamma=53.1301023611111 +k=0.99984 +x_0=590476.871463039 +y_0=442857.65309436 +ellps=evrstSS +towgs84=-679,669,-48,0,0,0,0 +to_meter=20.1167651215526 +no_defs +type=crs

Definition: JavaScript (Proj4js) 

proj4.defs("EPSG:29871","+proj=omerc +lat_0=4 +lonc=115 +alpha=53.3158204722222 +gamma=53.1301023611111 +k=0.99984 +x_0=590476.871463039 +y_0=442857.65309436 +ellps=evrstSS +towgs84=-679,669,-48,0,0,0,0 +to_meter=20.1167651215526 +no_defs +type=crs");

Definition: JSON

{
    "$schema": "https://proj.org/schemas/v0.7/projjson.schema.json",
    "type": "ProjectedCRS",
    "name": "Timbalai 1948 / RSO Borneo (ch)",
    "base_crs": {
        "name": "Timbalai 1948",
        "datum": {
            "type": "GeodeticReferenceFrame",
            "name": "Timbalai 1948",
            "ellipsoid": {
                "name": "Everest 1830 (1967 Definition)",
                "semi_major_axis": 6377298.556,
                "inverse_flattening": 300.8017
            }
        },
        "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": 4298
        }
    },
    "conversion": {
        "name": "Rectified Skew Orthomorphic Borneo Grid (chain)",
        "method": {
            "name": "Hotine Oblique Mercator (variant B)",
            "id": {
                "authority": "EPSG",
                "code": 9815
            }
        },
        "parameters": [
            {
                "name": "Latitude of projection centre",
                "value": 4,
                "unit": "degree",
                "id": {
                    "authority": "EPSG",
                    "code": 8811
                }
            },
            {
                "name": "Longitude of projection centre",
                "value": 115,
                "unit": "degree",
                "id": {
                    "authority": "EPSG",
                    "code": 8812
                }
            },
            {
                "name": "Azimuth of initial line",
                "value": 53.3158204722222,
                "unit": "degree",
                "id": {
                    "authority": "EPSG",
                    "code": 8813
                }
            },
            {
                "name": "Angle from Rectified to Skew Grid",
                "value": 53.1301023611111,
                "unit": "degree",
                "id": {
                    "authority": "EPSG",
                    "code": 8814
                }
            },
            {
                "name": "Scale factor on initial line",
                "value": 0.99984,
                "unit": "unity",
                "id": {
                    "authority": "EPSG",
                    "code": 8815
                }
            },
            {
                "name": "Easting at projection centre",
                "value": 29352.4763,
                "unit": {
                    "type": "LinearUnit",
                    "name": "British chain (Sears 1922)",
                    "conversion_factor": 20.1167651215526
                },
                "id": {
                    "authority": "EPSG",
                    "code": 8816
                }
            },
            {
                "name": "Northing at projection centre",
                "value": 22014.3572,
                "unit": {
                    "type": "LinearUnit",
                    "name": "British chain (Sears 1922)",
                    "conversion_factor": 20.1167651215526
                },
                "id": {
                    "authority": "EPSG",
                    "code": 8817
                }
            }
        ]
    },
    "coordinate_system": {
        "subtype": "Cartesian",
        "axis": [
            {
                "name": "Easting",
                "abbreviation": "E",
                "direction": "east",
                "unit": {
                    "type": "LinearUnit",
                    "name": "British chain (Sears 1922)",
                    "conversion_factor": 20.1167651215526
                }
            },
            {
                "name": "Northing",
                "abbreviation": "N",
                "direction": "north",
                "unit": {
                    "type": "LinearUnit",
                    "name": "British chain (Sears 1922)",
                    "conversion_factor": 20.1167651215526
                }
            }
        ]
    },
    "scope": "Engineering survey, topographic mapping.",
    "area": "Brunei - onshore and offshore; Malaysia - East Malaysia (Sabah; Sarawak) - onshore and offshore.",
    "bbox": {
        "south_latitude": 0.85,
        "west_longitude": 109.31,
        "north_latitude": 7.67,
        "east_longitude": 119.61
    },
    "id": {
        "authority": "EPSG",
        "code": 29871
    }
}

Definition: GeoServer

29871=PROJCS["Timbalai 1948 / RSO Borneo (ch)",GEOGCS["Timbalai 1948",DATUM["Timbalai_1948",SPHEROID["Everest 1830 (1967 Definition)",6377298.556,300.8017],TOWGS84[-679,669,-48,0,0,0,0]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4298"]],PROJECTION["Hotine_Oblique_Mercator_Azimuth_Center"],PARAMETER["latitude_of_center",4],PARAMETER["longitude_of_center",115],PARAMETER["azimuth",53.3158204722222],PARAMETER["rectified_grid_angle",53.1301023611111],PARAMETER["scale_factor",0.99984],PARAMETER["false_easting",29352.4763],PARAMETER["false_northing",22014.3572],UNIT["British chain (Sears 1922)",20.1167651215526],AXIS["Easting",EAST],AXIS["Northing",NORTH],AUTHORITY["EPSG","29871"]]

Definition: MapServer - MAPfile

PROJECTION
	"proj=omerc"
	"lat_0=4"
	"lonc=115"
	"alpha=53.3158204722222"
	"gamma=53.1301023611111"
	"k=0.99984"
	"x_0=590476.871463039"
	"y_0=442857.65309436"
	"ellps=evrstSS"
	"towgs84=-679,669,-48,0,0,0,0"
	"to_meter=20.1167651215526"
	"no_defs"
	"type=crs"
END

Definition: Mapnik

<?xml version="1.0" encoding="utf-8"?>
<Map srs="+proj=omerc +lat_0=4 +lonc=115 +alpha=53.3158204722222 +gamma=53.1301023611111 +k=0.99984 +x_0=590476.871463039 +y_0=442857.65309436 +ellps=evrstSS +towgs84=-679,669,-48,0,0,0,0 +to_meter=20.1167651215526 +no_defs +type=crs">
	<Layer srs="+proj=omerc +lat_0=4 +lonc=115 +alpha=53.3158204722222 +gamma=53.1301023611111 +k=0.99984 +x_0=590476.871463039 +y_0=442857.65309436 +ellps=evrstSS +towgs84=-679,669,-48,0,0,0,0 +to_meter=20.1167651215526 +no_defs +type=crs">
	</Layer>
</Map>

Definition: SQL (PostGIS)

INSERT into spatial_ref_sys (srid, auth_name, auth_srid, proj4text, srtext) values ( 29871, 'EPSG', 29871, '+proj=omerc +lat_0=4 +lonc=115 +alpha=53.3158204722222 +gamma=53.1301023611111 +k=0.99984 +x_0=590476.871463039 +y_0=442857.65309436 +ellps=evrstSS +towgs84=-679,669,-48,0,0,0,0 +to_meter=20.1167651215526 +no_defs +type=crs', 'PROJCS["Timbalai 1948 / RSO Borneo (ch)",GEOGCS["Timbalai 1948",DATUM["Timbalai_1948",SPHEROID["Everest 1830 (1967 Definition)",6377298.556,300.8017],TOWGS84[-679,669,-48,0,0,0,0]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4298"]],PROJECTION["Hotine_Oblique_Mercator_Azimuth_Center"],PARAMETER["latitude_of_center",4],PARAMETER["longitude_of_center",115],PARAMETER["azimuth",53.3158204722222],PARAMETER["rectified_grid_angle",53.1301023611111],PARAMETER["scale_factor",0.99984],PARAMETER["false_easting",29352.4763],PARAMETER["false_northing",22014.3572],UNIT["British chain (Sears 1922)",20.1167651215526],AXIS["Easting",EAST],AXIS["Northing",NORTH],AUTHORITY["EPSG","29871"]]');