Hydrography and nautical charting.
Caspian Sea water levels are now offset appreciably from this datum.
42.16 50.44
37.35 46.95
46.97 53.93
46.95 37.35
53.93 46.97
Definition: OGC Well Known Text 2 (2019)
VERTCRS["Caspian depth", VDATUM["Caspian Sea"], CS[vertical,1], AXIS["depth (D)",down, LENGTHUNIT["metre",1]], USAGE[ SCOPE["Hydrography and nautical charting."], AREA["Azerbaijan - offshore; Kazakhstan - offshore; Russian Federation - Caspian Sea; Turkmenistan - offshore."], BBOX[37.35,46.95,46.97,53.93]], ID["EPSG",5706]]
Definition: JSON
{ "$schema": "https://proj.org/schemas/v0.7/projjson.schema.json", "type": "VerticalCRS", "name": "Caspian depth", "datum": { "type": "VerticalReferenceFrame", "name": "Caspian Sea" }, "coordinate_system": { "subtype": "vertical", "axis": [ { "name": "Depth", "abbreviation": "D", "direction": "down", "unit": "metre" } ] }, "scope": "Hydrography and nautical charting.", "area": "Azerbaijan - offshore; Kazakhstan - offshore; Russian Federation - Caspian Sea; Turkmenistan - offshore.", "bbox": { "south_latitude": 37.35, "west_longitude": 46.95, "north_latitude": 46.97, "east_longitude": 53.93 }, "id": { "authority": "EPSG", "code": 5706 } }
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 ( 5706, 'EPSG', 5706, '+vunits=m +no_defs +type=crs', 'VERT_CS["Caspian depth",VERT_DATUM["Caspian Sea",2005,AUTHORITY["EPSG","5106"]],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AXIS["Depth",DOWN],AUTHORITY["EPSG","5706"]]');