EPSG
General Directorate of Land, http://www.dgterritorio.pt/
2013-04-10
Geodesy, engineering survey, topographic mapping.
Orthometric heights.
Definition: JSON
{ "$schema": "https://proj.org/schemas/v0.7/projjson.schema.json", "type": "VerticalReferenceFrame", "name": "Cais da Vila do Porto", "scope": "Geodesy, engineering survey, topographic mapping.", "area": "Portugal - eastern Azores onshore - Santa Maria, Formigas.", "bbox": { "south_latitude": 36.87, "west_longitude": -25.26, "north_latitude": 37.34, "east_longitude": -24.72 }, "id": { "authority": "EPSG", "code": 1109 } }