national geodetic vertical datum of 1929

{
  "id": "MLC-T-ENV-018160",
  "term": "national geodetic vertical datum of 1929",
  "field": "Environment",
  "definition": "A fixed reference adopted as a standard geodetic datum for elevations; it was determined by leveling networks across the United States and sea-level measurements at 26 coastal tide stations; this reference is now superseded by the North American vertical datum of 1988 (NAVD88).",
  "abbreviation": "NGVD29",
  "subject": "Water",
  "references": [
    "Coastal Sensitivity to Sea-level Rise Glossary and Acronyms"
  ],
  "url": "https://mlchart.com/terminology/environment/national-geodetic-vertical-datum-of-1929/"
}