EPSG:5103

North American Vertical Datum 1988

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Definition: OGC Well Known Text

VERT_DATUM["North American Vertical Datum 1988",2005,
    AUTHORITY["EPSG","5103"]]

Definition: OGC Well Known Text 2 (2019)

VDATUM["North American Vertical Datum 1988",
    ID["EPSG",5103]]

Definition: ESRI Well Known Text

VDATUM["North_American_Vertical_Datum_1988"]

Definition: JSON

{
    "$schema": "https://proj.org/schemas/v0.5/projjson.schema.json",
    "type": "VerticalReferenceFrame",
    "name": "North American Vertical Datum 1988",
    "scope": "Geodesy, topographic mapping.",
    "area": "Mexico - onshore. United States (USA) - CONUS and Alaska - onshore - Alabama; Alaska; Arizona; Arkansas; California; Colorado; Connecticut; Delaware; Florida; Georgia; Idaho; Illinois; Indiana; Iowa; Kansas; Kentucky; Louisiana; Maine; Maryland; Massachusetts; Michigan; Minnesota; Mississippi; Missouri; Montana; Nebraska; Nevada; New Hampshire; New Jersey; New Mexico; New York; North Carolina; North Dakota; Ohio; Oklahoma; Oregon; Pennsylvania; Rhode Island; South Carolina; South Dakota; Tennessee; Texas; Utah; Vermont; Virginia; Washington; West Virginia; Wisconsin; Wyoming.",
    "bbox": {
        "south_latitude": 14.51,
        "west_longitude": 172.42,
        "north_latitude": 71.4,
        "east_longitude": -66.91
    },
    "id": {
        "authority": "EPSG",
        "code": 5103
    }
}

Definition: GeoServer

5103-datum=VERT_DATUM["North American Vertical Datum 1988",2005,AUTHORITY["EPSG","5103"]]