North American Datum of 1983
E244555
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.
All labels observed (4)
| Label | Occurrences |
|---|---|
| North American Datum of 1983 canonical | 3 |
| NAD 83 | 1 |
| NAD83 | 1 |
| NAD83(CORS96) | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T2209724 — 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 Datum of 1983 Context triple: [National Spatial Reference System, historicalComponent, North American Datum of 1983]
-
A.
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.
-
B.
WGS84
WGS84 is the global geodetic reference system and standard coordinate framework used for GPS and most modern mapping applications.
-
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.
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.
-
E.
San Bernardino meridian
The San Bernardino meridian is a principal survey meridian used as a reference line for land surveying and mapping in Southern California and parts of Nevada.
- 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 Datum of 1983 Target entity description: 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.
-
A.
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.
-
B.
WGS84
WGS84 is the global geodetic reference system and standard coordinate framework used for GPS and most modern mapping applications.
-
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.
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.
-
E.
San Bernardino meridian
The San Bernardino meridian is a principal survey meridian used as a reference line for land surveying and mapping in Southern California and parts of Nevada.
- F. None of above. chosen
Statements (50)
| Predicate | Object |
|---|---|
| instanceOf |
geodetic datum
ⓘ
reference system ⓘ |
| abbreviation |
NAD83
ⓘ
linked to:
North American Datum of 1983
|
| accountsFor | tectonic plate motion ⓘ |
| approximateAlignment | WGS84 ⓘ |
| basedOnEllipsoid | GRS80 ⓘ |
| continentUsedIn | North America ⓘ |
| coordinateSystem |
geodetic 2D
ⓘ
geodetic 3D ⓘ |
| coordinateUnit | degree ⓘ |
| countryUsedIn |
Canada
ⓘ
Mexico ⓘ United States ⓘ
linked to:
United States of America
|
| datumType | horizontal datum ⓘ |
| defines |
ellipsoidal height
ⓘ
geodetic coordinates ⓘ horizontal positions ⓘ latitude ⓘ longitude ⓘ |
| epoch | 1983.0 ⓘ |
| hasRealization |
NAD83(1986)
ⓘ
NAD83(2011) ⓘ NAD83(CORS96) ⓘ
linked to:
North American Datum of 1983
NAD83(HARN) ⓘ NAD83(NSRS2007) ⓘ |
| introducedToReplace | local-astronomic NAD27 framework ⓘ |
| maintainedBy |
National Geodetic Survey
ⓘ
Natural Resources Canada ⓘ |
| plateFixedTo |
North American tectonic plate
ⓘ
linked to:
North American Plate
|
| realizationOf |
Earth-centered Earth-fixed reference frame
ⓘ
linked to:
Earth-centered Earth-fixed
|
| referenceFrameType | geocentric ⓘ |
| referenceSurface | reference ellipsoid ⓘ |
| regionCovered |
Alaska
ⓘ
Canada ⓘ Caribbean ⓘ Central America ⓘ Mexico ⓘ continental United States ⓘ
linked to:
contiguous United States
|
| relatedTo |
World Geodetic System 1984
ⓘ
linked to:
WGS84
|
| replaced | North American Datum of 1927 ⓘ |
| supportsProjection |
State Plane Coordinate System
ⓘ
UTM ⓘ |
| timeDependent | true ⓘ |
| usedBy |
GIS professionals
ⓘ
federal mapping agencies in the United States ⓘ provincial and federal mapping agencies in Canada ⓘ surveyors ⓘ |
| usedFor |
mapping
ⓘ
navigation ⓘ surveying ⓘ |
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 Datum of 1983 Description of subject: 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.
Referenced by (6)
Full triples — surface form annotated when it differs from this entity's canonical label.
linked to: North American Datum of 1983
linked to: North American Datum of 1983
linked to: North American Datum of 1983