Hydrography, drilling.
Approximate because not specific to any location or epoch. Users are advised to not use this generic CRS but instead use one with a specific datum origin (e.g. "Mean Sea Level at xxx during yyyy-yyyy") or defined through a specified geoid/hydroid model.
45.13 -129.02
15.56 -65.69
74.71 167.65
167.65 15.56
-65.69 74.71
Definition: OGC Well Known Text 2 (2019)
VERTCRS["MSL depth (ftUS)", VDATUM["Mean Sea Level"], CS[vertical,1], AXIS["depth (D)",down, LENGTHUNIT["US survey foot",0.304800609601219]], USAGE[ SCOPE["Hydrography, drilling."], AREA["United States (USA) - onshore and offshore."], BBOX[15.56,167.65,74.71,-65.69]], ID["EPSG",8053]]
Definition: JSON
{ "$schema": "https://proj.org/schemas/v0.7/projjson.schema.json", "type": "VerticalCRS", "name": "MSL depth (ftUS)", "datum": { "type": "VerticalReferenceFrame", "name": "Mean Sea Level" }, "coordinate_system": { "subtype": "vertical", "axis": [ { "name": "Depth", "abbreviation": "D", "direction": "down", "unit": { "type": "LinearUnit", "name": "US survey foot", "conversion_factor": 0.304800609601219 } } ] }, "scope": "Hydrography, drilling.", "area": "United States (USA) - onshore and offshore.", "bbox": { "south_latitude": 15.56, "west_longitude": 167.65, "north_latitude": 74.71, "east_longitude": -65.69 }, "id": { "authority": "EPSG", "code": 8053 } }
Definition: Mapnik
<?xml version="1.0" encoding="utf-8"?> <Map srs="+vunits=us-ft +no_defs +type=crs"> <Layer srs="+vunits=us-ft +no_defs +type=crs"> </Layer> </Map>
Definition: SQL (PostGIS)
INSERT into spatial_ref_sys (srid, auth_name, auth_srid, proj4text, srtext) values ( 8053, 'EPSG', 8053, '+vunits=us-ft +no_defs +type=crs', 'VERT_CS["MSL depth (ftUS)",VERT_DATUM["Mean Sea Level",2005,AUTHORITY["EPSG","5100"]],UNIT["US survey foot",0.304800609601219,AUTHORITY["EPSG","9003"]],AXIS["Depth",DOWN],AUTHORITY["EPSG","8053"]]');