North American Vertical Datum of 1988
E246427
The North American Vertical Datum of 1988 (NAVD 88) is the primary geodetic reference system used across North America to define consistent elevations above mean sea level for mapping, surveying, and engineering.
All labels observed (2)
| Label | Occurrences |
|---|---|
| North American Vertical Datum of 1988 canonical | 3 |
| NAVD88 vertical datum | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T2209726 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: North American Vertical Datum of 1988 Context triple: [National Spatial Reference System, historicalComponent, North American Vertical Datum of 1988]
-
A.
North American Datum of 1983
North American Datum of 1983 is a geodetic reference system used across North America to define precise locations on the Earth's surface for mapping, surveying, and navigation.
-
B.
National Spatial Reference System
The National Spatial Reference System is the official coordinate framework used in the United States to define precise locations, elevations, and boundaries for mapping, surveying, and navigation.
-
C.
National Geodetic Survey
The National Geodetic Survey is the U.S. federal agency responsible for defining, maintaining, and providing access to the national coordinate system used for mapping, charting, and navigation.
-
D.
WGS84
WGS84 is the global geodetic reference system and standard coordinate framework used for GPS and most modern mapping applications.
-
E.
International Terrestrial Reference System
The International Terrestrial Reference System is a globally standardized, Earth-centered coordinate framework used for precise positioning, navigation, and geodetic measurements.
- F. None of above. chosen
- G. Unsure - the case is ambiguous/there is not enough information to decide.
NED2
Entity disambiguation (via description)
gpt-5-mini-2025-08-07
Target entity: North American Vertical Datum of 1988 Target entity description: The North American Vertical Datum of 1988 (NAVD 88) is the primary geodetic reference system used across North America to define consistent elevations above mean sea level for mapping, surveying, and engineering.
-
A.
North American Datum of 1983
North American Datum of 1983 is a geodetic reference system used across North America to define precise locations on the Earth's surface for mapping, surveying, and navigation.
-
B.
National Spatial Reference System
The National Spatial Reference System is the official coordinate framework used in the United States to define precise locations, elevations, and boundaries for mapping, surveying, and navigation.
-
C.
National Geodetic Survey
The National Geodetic Survey is the U.S. federal agency responsible for defining, maintaining, and providing access to the national coordinate system used for mapping, charting, and navigation.
-
D.
WGS84
WGS84 is the global geodetic reference system and standard coordinate framework used for GPS and most modern mapping applications.
-
E.
International Terrestrial Reference System
The International Terrestrial Reference System is a globally standardized, Earth-centered coordinate framework used for precise positioning, navigation, and geodetic measurements.
- F. None of above. chosen
Statements (47)
| Predicate | Object |
|---|---|
| instanceOf |
geodetic reference system
ⓘ
vertical datum ⓘ |
| abbreviation | NAVD 88 ⓘ |
| alsoKnownAs |
NAVD 88
ⓘ
surface form:
NAVD88
|
| applicationDomain |
cartography
ⓘ
civil engineering ⓘ geodesy ⓘ hydrology ⓘ |
| continentUsedIn | North America ⓘ |
| coordinateComponent | vertical coordinate ⓘ |
| coordinateReferenceSystemType | vertical coordinate reference system ⓘ |
| countryUsedIn |
Canada
ⓘ
Mexico ⓘ United States of America ⓘ
surface form:
United States
|
| datumType | orthometric datum ⓘ |
| defines | orthometric heights ⓘ |
| definesHeightsRelativeTo | mean sea level ⓘ |
| epoch | 1988 ⓘ |
| heightType | orthometric height ⓘ |
| isSuccessorOf | National Geodetic Vertical Datum of 1929 ⓘ |
| maintainedBy |
National Geodetic Survey
ⓘ
National Oceanic and Atmospheric Administration ⓘ
surface form:
U.S. National Oceanic and Atmospheric Administration
|
| measurementUnit | meter ⓘ |
| plannedToBeReplacedBy | modernized geopotential datum by National Geodetic Survey ⓘ |
| referenceFrameRealization | network of leveling benchmarks ⓘ |
| referenceSurface | geopotential surface ⓘ |
| referenceType | mean sea level–based vertical reference ⓘ |
| region |
Alaska
ⓘ
continental United States ⓘ parts of Canada ⓘ parts of Mexico ⓘ |
| replaced | National Geodetic Vertical Datum of 1929 ⓘ |
| scope |
elevation control
ⓘ
height determination ⓘ |
| standardizedBy | federal geodetic control standards in the United States ⓘ |
| status |
primary vertical datum in much of North America
ⓘ
primary vertical datum in the United States ⓘ |
| usedFor |
engineering
ⓘ
mapping ⓘ surveying ⓘ |
| usedIn |
coastal engineering
ⓘ
construction surveying ⓘ floodplain mapping ⓘ infrastructure design ⓘ topographic mapping ⓘ transportation infrastructure planning ⓘ |
| usedWith | North American Datum of 1983 ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: North American Vertical Datum of 1988 Description of subject: The North American Vertical Datum of 1988 (NAVD 88) is the primary geodetic reference system used across North America to define consistent elevations above mean sea level for mapping, surveying, and engineering.
Referenced by (4)
Full triples — surface form annotated when it differs from this entity's canonical label.
subject surface form:
National Geodetic Survey
this entity surface form:
NAVD88 vertical datum