Clarke 1866 ellipsoid
E1572540
UNEXPLORED
The Clarke 1866 ellipsoid is a historically important reference ellipsoid used as the geodetic basis for many 19th- and 20th-century national mapping systems, particularly in North America.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Clarke 1866 ellipsoid canonical | 2 |
How this entity was disambiguated
This entity first appeared as the object of triple T23185764 — 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: Clarke 1866 ellipsoid Context triple: [Bessel ellipsoid, comparedTo, Clarke 1866 ellipsoid]
-
A.
Airy 1830 ellipsoid
The Airy 1830 ellipsoid is a reference ellipsoid defined in the 19th century for geodetic calculations in Great Britain, forming the basis of traditional mapping systems such as the British National Grid.
-
B.
Bessel ellipsoid
The Bessel ellipsoid is a historical reference ellipsoid of the Earth defined in the 19th century for geodetic and cartographic purposes, particularly in Europe.
-
C.
GRS80
GRS80 is a geodetic reference ellipsoid defined in 1980 that serves as a standard mathematical model of the Earth's shape for modern mapping and surveying systems.
-
D.
Airy Modified ellipsoid
The Airy Modified ellipsoid is a slightly adjusted version of the Airy ellipsoid used as the reference surface for mapping and geodetic calculations in systems such as the Irish grid reference system.
-
E.
Lambert-93
Lambert-93 is a French national projected coordinate reference system based on the Lambert conformal conic projection, widely used for mapping and geospatial data across mainland France.
- 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: Clarke 1866 ellipsoid Target entity description: The Clarke 1866 ellipsoid is a historically important reference ellipsoid used as the geodetic basis for many 19th- and 20th-century national mapping systems, particularly in North America.
-
A.
Airy 1830 ellipsoid
The Airy 1830 ellipsoid is a reference ellipsoid defined in the 19th century for geodetic calculations in Great Britain, forming the basis of traditional mapping systems such as the British National Grid.
-
B.
Bessel ellipsoid
The Bessel ellipsoid is a historical reference ellipsoid of the Earth defined in the 19th century for geodetic and cartographic purposes, particularly in Europe.
-
C.
GRS80
GRS80 is a geodetic reference ellipsoid defined in 1980 that serves as a standard mathematical model of the Earth's shape for modern mapping and surveying systems.
-
D.
Airy Modified ellipsoid
The Airy Modified ellipsoid is a slightly adjusted version of the Airy ellipsoid used as the reference surface for mapping and geodetic calculations in systems such as the Irish grid reference system.
-
E.
Lambert-93
Lambert-93 is a French national projected coordinate reference system based on the Lambert conformal conic projection, widely used for mapping and geospatial data across mainland France.
- F. None of above. chosen
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.