metre
EPSG
GDA2020 Technical Manual v1.4 and Australian Vertical Working Surface (AVWS) Technical Implementation Plan v1.2 (http://www.icsm.gov.au).
2020-10-21
Cadastre, engineering surveying applications over distances up to 10km.
Appropriate for cadastral and local engineering survey including construction or mining. Only suitable onshore. AVWS height (CRS code 9458) is more accurate than AHD height for applications over distances greater than 10 km and also extends offshore.
Definition: OGC Well Known Text 2 (2019)
VERTCRS["AHD height", VDATUM["Australian Height Datum"], CS[vertical,1], AXIS["gravity-related height (H)",up, LENGTHUNIT["metre",1]], USAGE[ SCOPE["Cadastre, engineering surveying applications over distances up to 10km."], AREA["Australia - Australian Capital Territory, New South Wales, Northern Territory, Queensland, South Australia, Tasmania, Western Australia and Victoria - onshore. Christmas Island - onshore. Cocos and Keeling Islands - onshore."], BBOX[-43.7,96.76,-9.86,153.69]], ID["EPSG",5711]]
Definition: JSON
{ "$schema": "https://proj.org/schemas/v0.7/projjson.schema.json", "type": "VerticalCRS", "name": "AHD height", "datum": { "type": "VerticalReferenceFrame", "name": "Australian Height Datum" }, "coordinate_system": { "subtype": "vertical", "axis": [ { "name": "Gravity-related height", "abbreviation": "H", "direction": "up", "unit": "metre" } ] }, "scope": "Cadastre, engineering surveying applications over distances up to 10km.", "area": "Australia - Australian Capital Territory, New South Wales, Northern Territory, Queensland, South Australia, Tasmania, Western Australia and Victoria - onshore. Christmas Island - onshore. Cocos and Keeling Islands - onshore.", "bbox": { "south_latitude": -43.7, "west_longitude": 96.76, "north_latitude": -9.86, "east_longitude": 153.69 }, "id": { "authority": "EPSG", "code": 5711 } }
Definition: Mapnik
<?xml version="1.0" encoding="utf-8"?> <Map srs="+vunits=m +no_defs +type=crs"> <Layer srs="+vunits=m +no_defs +type=crs"> </Layer> </Map>
Definition: SQL (PostGIS)
INSERT into spatial_ref_sys (srid, auth_name, auth_srid, proj4text, srtext) values ( 5711, 'EPSG', 5711, '+vunits=m +no_defs +type=crs', 'VERT_CS["AHD height",VERT_DATUM["Australian Height Datum",2005,AUTHORITY["EPSG","5111"]],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AXIS["Gravity-related height",UP],AUTHORITY["EPSG","5711"]]');