Change of height to a different vertical reference surface.
Well Datum datum plane is 4.25m above PWD datum plane.
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Definition: OGC Well Known Text 2 (2019)
COORDINATEOPERATION["KOC WD depth to Kuwait PWD height (1)", VERSION["KOC-Kwt"], SOURCECRS[ VERTCRS["KOC WD depth", VDATUM["KOC Well Datum"], CS[vertical,1], AXIS["depth (D)",down, LENGTHUNIT["metre",1]], ID["EPSG",5789]]], TARGETCRS[ VERTCRS["Kuwait PWD height", VDATUM["Kuwait PWD"], CS[vertical,1], AXIS["gravity-related height (H)",up, LENGTHUNIT["metre",1]], ID["EPSG",5788]]], METHOD["Vertical Offset", ID["EPSG",9616]], PARAMETER["Vertical Offset",4.25, LENGTHUNIT["metre",1], ID["EPSG",8603]], OPERATIONACCURACY[0.1], USAGE[ SCOPE["Change of height to a different vertical reference surface."], AREA["Kuwait - onshore."], BBOX[28.53,46.54,30.09,48.48]], ID["EPSG",5455], REMARK["Well Datum datum plane is 4.25m above PWD datum plane."]]
Definition: JSON
{ "$schema": "https://proj.org/schemas/v0.7/projjson.schema.json", "type": "Transformation", "name": "KOC WD depth to Kuwait PWD height (1)", "source_crs": { "type": "VerticalCRS", "name": "KOC WD depth", "datum": { "type": "VerticalReferenceFrame", "name": "KOC Well Datum" }, "coordinate_system": { "subtype": "vertical", "axis": [ { "name": "Depth", "abbreviation": "D", "direction": "down", "unit": "metre" } ] }, "id": { "authority": "EPSG", "code": 5789 } }, "target_crs": { "type": "VerticalCRS", "name": "Kuwait PWD height", "datum": { "type": "VerticalReferenceFrame", "name": "Kuwait PWD" }, "coordinate_system": { "subtype": "vertical", "axis": [ { "name": "Gravity-related height", "abbreviation": "H", "direction": "up", "unit": "metre" } ] }, "id": { "authority": "EPSG", "code": 5788 } }, "method": { "name": "Vertical Offset", "id": { "authority": "EPSG", "code": 9616 } }, "parameters": [ { "name": "Vertical Offset", "value": 4.25, "unit": "metre", "id": { "authority": "EPSG", "code": 8603 } } ], "accuracy": "0.1", "scope": "Change of height to a different vertical reference surface.", "area": "Kuwait - onshore.", "bbox": { "south_latitude": 28.53, "west_longitude": 46.54, "north_latitude": 30.09, "east_longitude": 48.48 }, "id": { "authority": "EPSG", "code": 5455 }, "remarks": "Well Datum datum plane is 4.25m above PWD datum plane." }
Definition: Mapnik
<?xml version="1.0" encoding="utf-8"?> <Map srs="+proj=geogoffset +dh=4.25"> <Layer srs="+proj=geogoffset +dh=4.25"> </Layer> </Map>