degree (supplier to define representation)
St. Helena Geodetic Datum 2015
EPSG
St. Helena Government, Environment and Natural Resources Directorate (ENRD).
2016-10-29
Engineering survey including Airport and Ruperts Wharf construction.
Closely aligned to SHGD2015 (CRS code xxxx) with difference attributable to different reference epoch and 10 cm difference in ellipsoid height.
St Helena, Ascension and Tristan da Cunha - St Helena Island - onshore.
-5.72 -15.96
-5.85 -16.08
-5.59 -15.85
-5.85 -16.08
-5.59 -15.85
Definition: OGC Well Known Text 2 (2019)
GEOGCRS["SHGD2015", DATUM["St. Helena Geodetic Datum 2015", ELLIPSOID["GRS 1980",6378137,298.257222101, LENGTHUNIT["metre",1]]], PRIMEM["Greenwich",0, ANGLEUNIT["degree",0.0174532925199433]], CS[ellipsoidal,3], AXIS["geodetic latitude (Lat)",north, ORDER[1], ANGLEUNIT["degree",0.0174532925199433]], AXIS["geodetic longitude (Lon)",east, ORDER[2], ANGLEUNIT["degree",0.0174532925199433]], AXIS["ellipsoidal height (h)",up, ORDER[3], LENGTHUNIT["metre",1]], USAGE[ SCOPE["Engineering survey including Airport and Ruperts Wharf construction."], AREA["St Helena, Ascension and Tristan da Cunha - St Helena Island - onshore."], BBOX[-16.08,-5.85,-15.85,-5.59]], ID["EPSG",7885]]
Definition: JSON
{ "$schema": "https://proj.org/schemas/v0.7/projjson.schema.json", "type": "GeographicCRS", "name": "SHGD2015", "datum": { "type": "GeodeticReferenceFrame", "name": "St. Helena Geodetic Datum 2015", "ellipsoid": { "name": "GRS 1980", "semi_major_axis": 6378137, "inverse_flattening": 298.257222101 } }, "coordinate_system": { "subtype": "ellipsoidal", "axis": [ { "name": "Geodetic latitude", "abbreviation": "Lat", "direction": "north", "unit": "degree" }, { "name": "Geodetic longitude", "abbreviation": "Lon", "direction": "east", "unit": "degree" }, { "name": "Ellipsoidal height", "abbreviation": "h", "direction": "up", "unit": "metre" } ] }, "scope": "Engineering survey including Airport and Ruperts Wharf construction.", "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": 7885 } }
Definition: Mapnik
<?xml version="1.0" encoding="utf-8"?> <Map srs="+proj=longlat +ellps=GRS80 +no_defs +type=crs"> <Layer srs="+proj=longlat +ellps=GRS80 +no_defs +type=crs"> </Layer> </Map>