metre
Topographic mapping.
None
St Helena, Ascension and Tristan da Cunha - St Helena Island - onshore.
Data Source: EPSG v11.022 2024-11-05
Datum: Astro DOS 71
Coordinate System: cartesian
Projection: St. Helena Local Grid 1971
Geodetic CRS: Astro DOS 71
PROJCRS["Astro DOS 71 / SHLG71",
BASEGEOGCRS["Astro DOS 71",
DATUM["Astro DOS 71",
ELLIPSOID["International 1924",6378388,297,
LENGTHUNIT["metre",1]]],
PRIMEM["Greenwich",0,
ANGLEUNIT["degree",0.0174532925199433]],
ID["EPSG",4710]],
CONVERSION["St. Helena Local Grid 1971",
METHOD["Transverse Mercator",
ID["EPSG",9807]],
PARAMETER["Latitude of natural origin",-15.9666666666667,
ANGLEUNIT["degree",0.0174532925199433],
ID["EPSG",8801]],
PARAMETER["Longitude of natural origin",-5.71666666666667,
ANGLEUNIT["degree",0.0174532925199433],
ID["EPSG",8802]],
PARAMETER["Scale factor at natural origin",1,
SCALEUNIT["unity",1],
ID["EPSG",8805]],
PARAMETER["False easting",300000,
LENGTHUNIT["metre",1],
ID["EPSG",8806]],
PARAMETER["False northing",2000000,
LENGTHUNIT["metre",1],
ID["EPSG",8807]]],
CS[Cartesian,2],
AXIS["(E)",east,
ORDER[1],
LENGTHUNIT["metre",1]],
AXIS["(N)",north,
ORDER[2],
LENGTHUNIT["metre",1]],
USAGE[
SCOPE["Topographic mapping."],
AREA["St Helena, Ascension and Tristan da Cunha - St Helena Island - onshore."],
BBOX[-16.08,-5.85,-15.85,-5.59]],
ID["EPSG",7877]]
{
"$schema": "https://proj.org/schemas/v0.7/projjson.schema.json",
"type": "ProjectedCRS",
"name": "Astro DOS 71 / SHLG71",
"base_crs": {
"name": "Astro DOS 71",
"datum": {
"type": "GeodeticReferenceFrame",
"name": "Astro DOS 71",
"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": 4710
}
},
"conversion": {
"name": "St. Helena Local Grid 1971",
"method": {
"name": "Transverse Mercator",
"id": {
"authority": "EPSG",
"code": 9807
}
},
"parameters": [
{
"name": "Latitude of natural origin",
"value": -15.9666666666667,
"unit": "degree",
"id": {
"authority": "EPSG",
"code": 8801
}
},
{
"name": "Longitude of natural origin",
"value": -5.71666666666667,
"unit": "degree",
"id": {
"authority": "EPSG",
"code": 8802
}
},
{
"name": "Scale factor at natural origin",
"value": 1,
"unit": "unity",
"id": {
"authority": "EPSG",
"code": 8805
}
},
{
"name": "False easting",
"value": 300000,
"unit": "metre",
"id": {
"authority": "EPSG",
"code": 8806
}
},
{
"name": "False northing",
"value": 2000000,
"unit": "metre",
"id": {
"authority": "EPSG",
"code": 8807
}
}
]
},
"coordinate_system": {
"subtype": "Cartesian",
"axis": [
{
"name": "Easting",
"abbreviation": "E",
"direction": "east",
"unit": "metre"
},
{
"name": "Northing",
"abbreviation": "N",
"direction": "north",
"unit": "metre"
}
]
},
"scope": "Topographic mapping.",
"area": "St Helena, Ascension and Tristan da Cunha - St Helena Island - onshore.",
"bbox": {
"south_latitude": -16.08,
"west_longitude": -5.85,
"north_latitude": -15.85,
"east_longitude": -5.59
},
"id": {
"authority": "EPSG",
"code": 7877
}
}
{'crs_wkt': 'PROJCRS["Astro DOS 71 / SHLG71",BASEGEOGCRS["Astro DOS '
'71",DATUM["Astro DOS 71",ELLIPSOID["International '
'1924",6378388,297,LENGTHUNIT["metre",1]]],PRIMEM["Greenwich",0,ANGLEUNIT["degree",0.0174532925199433]],ID["EPSG",4710]],CONVERSION["St. '
'Helena Local Grid 1971",METHOD["Transverse '
'Mercator",ID["EPSG",9807]],PARAMETER["Latitude of natural '
'origin",-15.9666666666667,ANGLEUNIT["degree",0.0174532925199433],ID["EPSG",8801]],PARAMETER["Longitude '
'of natural '
'origin",-5.71666666666667,ANGLEUNIT["degree",0.0174532925199433],ID["EPSG",8802]],PARAMETER["Scale '
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'origin",1,SCALEUNIT["unity",1],ID["EPSG",8805]],PARAMETER["False '
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'northing",2000000,LENGTHUNIT["metre",1],ID["EPSG",8807]]],CS[Cartesian,2],AXIS["(E)",east,ORDER[1],LENGTHUNIT["metre",1]],AXIS["(N)",north,ORDER[2],LENGTHUNIT["metre",1]],USAGE[SCOPE["Topographic '
'mapping."],AREA["St Helena, Ascension and Tristan da Cunha - St '
'Helena Island - '
'onshore."],BBOX[-16.08,-5.85,-15.85,-5.59]],ID["EPSG",7877]]',
'false_easting': 300000.0,
'false_northing': 2000000.0,
'geographic_crs_name': 'Astro DOS 71',
'grid_mapping_name': 'transverse_mercator',
'horizontal_datum_name': 'Astro DOS 71',
'inverse_flattening': 297.0,
'latitude_of_projection_origin': -15.966666666666667,
'longitude_of_central_meridian': -5.716666666666667,
'longitude_of_prime_meridian': 0.0,
'prime_meridian_name': 'Greenwich',
'projected_crs_name': 'Astro DOS 71 / SHLG71',
'reference_ellipsoid_name': 'International 1924',
'scale_factor_at_central_meridian': 1.0,
'semi_major_axis': 6378388.0,
'semi_minor_axis': 6356911.9461279465}