Topographic mapping.
Black Sea datum is 0.4m below Baltic datum.
Definition: OGC Well Known Text 2 (2019)
VERTCRS["Black Sea height", VDATUM["Black Sea"], CS[vertical,1], AXIS["gravity-related height (H)",up, LENGTHUNIT["metre",1]], USAGE[ SCOPE["Topographic mapping."], AREA["Georgia - onshore."], BBOX[41.04,39.99,43.59,46.72]], ID["EPSG",5735]]
Definition: JSON
{ "$schema": "https://proj.org/schemas/v0.7/projjson.schema.json", "type": "VerticalCRS", "name": "Black Sea height", "datum": { "type": "VerticalReferenceFrame", "name": "Black Sea" }, "coordinate_system": { "subtype": "vertical", "axis": [ { "name": "Gravity-related height", "abbreviation": "H", "direction": "up", "unit": "metre" } ] }, "scope": "Topographic mapping.", "area": "Georgia - onshore.", "bbox": { "south_latitude": 41.04, "west_longitude": 39.99, "north_latitude": 43.59, "east_longitude": 46.72 }, "id": { "authority": "EPSG", "code": 5735 } }
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 ( 5735, 'EPSG', 5735, '+vunits=m +no_defs +type=crs', 'VERT_CS["Black Sea height",VERT_DATUM["Black Sea",2005,AUTHORITY["EPSG","5134"]],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AXIS["Gravity-related height",UP],AUTHORITY["EPSG","5735"]]');