Geodesy, engineering survey, topographic mapping.
38.58 -28.72
38.46 -28.9
38.7 -28.54
-28.9 38.46
-28.54 38.7
Definition: OGC Well Known Text 2 (2019)
VERTCRS["Horta height", VDATUM["Horta"], CS[vertical,1], AXIS["gravity-related height (H)",up, LENGTHUNIT["metre",1]], USAGE[ SCOPE["Geodesy, engineering survey, topographic mapping."], AREA["Portugal - central Azores - Faial island onshore."], BBOX[38.46,-28.9,38.7,-28.54]], ID["EPSG",6181]]
Definition: JSON
{ "$schema": "https://proj.org/schemas/v0.7/projjson.schema.json", "type": "VerticalCRS", "name": "Horta height", "datum": { "type": "VerticalReferenceFrame", "name": "Horta" }, "coordinate_system": { "subtype": "vertical", "axis": [ { "name": "Gravity-related height", "abbreviation": "H", "direction": "up", "unit": "metre" } ] }, "scope": "Geodesy, engineering survey, topographic mapping.", "area": "Portugal - central Azores - Faial island onshore.", "bbox": { "south_latitude": 38.46, "west_longitude": -28.9, "north_latitude": 38.7, "east_longitude": -28.54 }, "id": { "authority": "EPSG", "code": 6181 } }
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 ( 6181, 'EPSG', 6181, '+vunits=m +no_defs +type=crs', 'VERT_CS["Horta height",VERT_DATUM["Horta",2005,AUTHORITY["EPSG","1104"]],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AXIS["Gravity-related height",UP],AUTHORITY["EPSG","6181"]]');