EPSG:5498 - NAD83 + NAVD88 height

{
  "$schema": "https://proj.org/schemas/v0.7/projjson.schema.json",
  "type": "CompoundCRS",
  "name": "NAD83 + NAVD88 height",
  "components": [
    {
      "type": "GeographicCRS",
      "name": "NAD83",
      "datum": {
        "type": "GeodeticReferenceFrame",
        "name": "North American Datum 1983",
        "ellipsoid": {
          "name": "GRS 1980",
          "semi_major_axis": 6378137,
          "inverse_flattening": 298.257222101
        }
      },
      "coordinate_system": {
        "subtype": "ellipsoidal",
        "axis": [
          {
            "name": "Geodetic latitude",
            "abbreviation": "Lat",
            "direction": "north",
            "unit": "degree"
          },
          {
            "name": "Geodetic longitude",
            "abbreviation": "Lon",
            "direction": "east",
            "unit": "degree"
          }
        ]
      }
    },
    {
      "type": "VerticalCRS",
      "name": "NAVD88 height",
      "datum": {
        "type": "VerticalReferenceFrame",
        "name": "North American Vertical Datum 1988"
      },
      "coordinate_system": {
        "subtype": "vertical",
        "axis": [
          {
            "name": "Gravity-related height",
            "abbreviation": "H",
            "direction": "up",
            "unit": "metre"
          }
        ]
      }
    }
  ],
  "scope": "Engineering survey, topographic mapping.",
  "area": "United States (USA) - CONUS and Alaska - onshore - Alabama; Alaska mainland; 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": 24.41,
    "west_longitude": -168.26,
    "north_latitude": 71.4,
    "east_longitude": -66.91
  },
  "id": {
    "authority": "EPSG",
    "code": 5498
  }
}

{'crs_wkt': 'COMPOUNDCRS["NAD83 + NAVD88 height",GEOGCRS["NAD83",DATUM["North '
            'American Datum 1983",ELLIPSOID["GRS '
            '1980",6378137,298.257222101,LENGTHUNIT["metre",1]]],PRIMEM["Greenwich",0,ANGLEUNIT["degree",0.0174532925199433]],CS[ellipsoidal,2],AXIS["geodetic '
            'latitude '
            '(Lat)",north,ORDER[1],ANGLEUNIT["degree",0.0174532925199433]],AXIS["geodetic '
            'longitude '
            '(Lon)",east,ORDER[2],ANGLEUNIT["degree",0.0174532925199433]]],VERTCRS["NAVD88 '
            'height",VDATUM["North American Vertical Datum '
            '1988"],CS[vertical,1],AXIS["gravity-related height '
            '(H)",up,LENGTHUNIT["metre",1]]],USAGE[SCOPE["Engineering survey, '
            'topographic mapping."],AREA["United States (USA) - CONUS and '
            'Alaska - onshore - Alabama; Alaska mainland; 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[24.41,-168.26,71.4,-66.91]],ID["EPSG",5498]]',
 'geographic_crs_name': 'NAD83',
 'geopotential_datum_name': 'North American Vertical Datum 1988',
 'grid_mapping_name': 'latitude_longitude',
 'horizontal_datum_name': 'North American Datum 1983',
 'inverse_flattening': 298.257222101,
 'longitude_of_prime_meridian': 0.0,
 'prime_meridian_name': 'Greenwich',
 'reference_ellipsoid_name': 'GRS 1980',
 'semi_major_axis': 6378137.0,
 'semi_minor_axis': 6356752.314140356}