North American Datum of 1927
E859783
The North American Datum of 1927 is a geodetic reference system that long served as the standard coordinate framework for mapping and surveying in North America before being superseded by more modern datums.
All labels observed (2)
| Label | Occurrences |
|---|---|
| North American Datum (for engineering and mapping) | 1 |
| North American Datum of 1927 canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T10378010 — 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 1927 Context triple: [North American Datum of 1983, replaced, North American Datum of 1927]
-
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.
North American Vertical Datum of 1988
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.
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C.
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.
-
D.
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.
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E.
WGS84
WGS84 is the global geodetic reference system and standard coordinate framework used for GPS and most modern mapping applications.
- 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 1927 Target entity description: The North American Datum of 1927 is a geodetic reference system that long served as the standard coordinate framework for mapping and surveying in North America before being superseded by more modern datums.
-
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.
North American Vertical Datum of 1988
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.
-
C.
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.
-
D.
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.
-
E.
WGS84
WGS84 is the global geodetic reference system and standard coordinate framework used for GPS and most modern mapping applications.
- F. None of above. chosen
Statements (48)
| Predicate | Object |
|---|---|
| instanceOf |
geodetic datum
ⓘ
geodetic reference system ⓘ horizontal datum ⓘ |
| abbreviation | NAD27 NERFINISHED ⓘ |
| basis | classical ground-based triangulation networks ⓘ |
| category |
cartography
ⓘ
geodesy ⓘ geographic information systems ⓘ |
| centeredOn | North American continent NERFINISHED ⓘ |
| continentUsedIn | North America NERFINISHED ⓘ |
| coordinateDifferencesMagnitude | tens of meters ⓘ |
| coordinateDifferencesRelativeTo | NAD83 ⓘ |
| coordinateSystemDimension | 2D horizontal ⓘ |
| coordinateSystemType | geodetic coordinate system ⓘ |
| datumType | local datum ⓘ |
| definedBy | U.S. Coast and Geodetic Survey NERFINISHED ⓘ |
| ellipsoid | Clarke 1866 NERFINISHED ⓘ |
| epoch | 1927 ⓘ |
| governingBodyForTransitionInUS | National Geodetic Survey NERFINISHED ⓘ |
| hasManyLocalAdjustments | true ⓘ |
| introducedInYear | 1927 ⓘ |
| notEarthCentered | true ⓘ |
| predecessorOf | North American Datum of 1983 NERFINISHED ⓘ |
| realizationOf | Clarke 1866 ellipsoid NERFINISHED ⓘ |
| referencePoint | Meades Ranch triangulation station NERFINISHED ⓘ |
| referencePointCountry | United States NERFINISHED ⓘ |
| referencePointLocation | Kansas NERFINISHED ⓘ |
| replacedInUSBy | NAD83 NERFINISHED ⓘ |
| status | obsolete for most official uses ⓘ |
| stillUsedFor |
historical GIS datasets
ⓘ
legacy mapping data ⓘ |
| supersededBy |
NAD83
ⓘ
North American Datum of 1983 NERFINISHED ⓘ |
| timePeriodOfPrimaryUse | 20th century ⓘ |
| usedFor |
cadastral surveys
ⓘ
engineering surveys ⓘ land surveying ⓘ mapping ⓘ topographic mapping ⓘ |
| usedInCountry |
Canada
ⓘ
Caribbean countries ⓘ Central American countries ⓘ Greenland NERFINISHED ⓘ Mexico ⓘ United States of America ⓘ
surface form:
United States
|
| usedWithMapProjections |
Albers Equal-Area Conic
NERFINISHED
ⓘ
Lambert Conformal Conic NERFINISHED ⓘ Transverse Mercator NERFINISHED ⓘ |
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 1927 Description of subject: The North American Datum of 1927 is a geodetic reference system that long served as the standard coordinate framework for mapping and surveying in North America before being superseded by more modern datums.
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.
California State Route 1 (within district boundaries)
→
coordinateSystem
→
North American Datum of 1927
ⓘ
this entity surface form:
North American Datum (for engineering and mapping)