Geodesy, engineering survey.
In Vietnam replaces Ha Tien height (CRS code 5726) from 1992.
Definition: OGC Well Known Text 2 (2019)
VERTCRS["Hon Dau 1992 height", VDATUM["Hon Dau 1992"], CS[vertical,1], AXIS["gravity-related height (H)",up, LENGTHUNIT["metre",1]], USAGE[ SCOPE["Geodesy, engineering survey."], AREA["Vietnam - mainland onshore."], BBOX[8.33,102.14,23.4,109.53]], ID["EPSG",5727]]
Definition: JSON
{ "$schema": "https://proj.org/schemas/v0.7/projjson.schema.json", "type": "VerticalCRS", "name": "Hon Dau 1992 height", "datum": { "type": "VerticalReferenceFrame", "name": "Hon Dau 1992" }, "coordinate_system": { "subtype": "vertical", "axis": [ { "name": "Gravity-related height", "abbreviation": "H", "direction": "up", "unit": "metre" } ] }, "scope": "Geodesy, engineering survey.", "area": "Vietnam - mainland onshore.", "bbox": { "south_latitude": 8.33, "west_longitude": 102.14, "north_latitude": 23.4, "east_longitude": 109.53 }, "id": { "authority": "EPSG", "code": 5727 } }
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 ( 5727, 'EPSG', 5727, '+vunits=m +no_defs +type=crs', 'VERT_CS["Hon Dau 1992 height",VERT_DATUM["Hon Dau 1992",2005,AUTHORITY["EPSG","5126"]],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AXIS["Gravity-related height",UP],AUTHORITY["EPSG","5727"]]');