British chain (Sears 1922)
Engineering survey, topographic mapping.
None
Brunei - onshore and offshore; Malaysia - East Malaysia (Sabah; Sarawak) - onshore and offshore.
Data Source: EPSG v11.016 2024-08-31
Datum: Timbalai 1948
Coordinate System: cartesian
Projection: Rectified Skew Orthomorphic Borneo Grid (chain)
Geodetic CRS: Timbalai 1948
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 at projection centre",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 at projection centre",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]]
{
"$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 at projection centre",
"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 at projection centre",
"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
}
}
{'azimuth_of_central_line': 53.31582047222222,
'crs_wkt': '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 '
'at projection '
'centre",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 at projection '
'centre",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]]',
'false_easting': 29352.4763,
'false_northing': 22014.3572,
'geographic_crs_name': 'Timbalai 1948',
'grid_mapping_name': 'oblique_mercator',
'horizontal_datum_name': 'Timbalai 1948',
'inverse_flattening': 300.8017,
'latitude_of_projection_origin': 4.0,
'longitude_of_prime_meridian': 0.0,
'longitude_of_projection_origin': 115.0,
'prime_meridian_name': 'Greenwich',
'projected_crs_name': 'Timbalai 1948 / RSO Borneo (ch)',
'reference_ellipsoid_name': 'Everest 1830 (1967 Definition)',
'scale_factor_at_projection_origin': 0.99984,
'semi_major_axis': 6377298.556,
'semi_minor_axis': 6356097.550300896}