GRS80
E859784
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.
All labels observed (1)
| Label | Occurrences |
|---|---|
| GRS80 canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T10378011 — 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: GRS80 Context triple: [North American Datum of 1983, basedOnEllipsoid, GRS80]
-
A.
WGS84
WGS84 is the global geodetic reference system and standard coordinate framework used for GPS and most modern mapping applications.
-
B.
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.
-
C.
Global Geodetic Observing System
The Global Geodetic Observing System is an international framework that integrates various space-geodetic and ground-based measurement techniques to monitor and understand changes in the Earth’s shape, rotation, and gravity field.
-
D.
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.
-
E.
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.
- 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: GRS80 Target entity description: 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.
-
A.
WGS84
WGS84 is the global geodetic reference system and standard coordinate framework used for GPS and most modern mapping applications.
-
B.
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.
-
C.
Global Geodetic Observing System
The Global Geodetic Observing System is an international framework that integrates various space-geodetic and ground-based measurement techniques to monitor and understand changes in the Earth’s shape, rotation, and gravity field.
-
D.
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.
-
E.
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.
- F. None of above. chosen
Statements (48)
| Predicate | Object |
|---|---|
| instanceOf |
Earth ellipsoid model
ⓘ
geodetic reference ellipsoid ⓘ |
| abbreviation | GRS 80 NERFINISHED ⓘ |
| angularVelocity | 7.292115e-5 rad/s ⓘ |
| basisFor |
ETRS89
ⓘ
NAD83 ⓘ many modern national datums ⓘ |
| category |
geodesy
ⓘ
reference systems ⓘ |
| coordinateSystem |
geocentric Cartesian
ⓘ
geodetic latitude-longitude-height ⓘ |
| datumRole | ellipsoid for global reference systems ⓘ |
| definedInYear | 1980 ⓘ |
| definingOrganization |
IAG
NERFINISHED
ⓘ
International Association of Geodesy NERFINISHED ⓘ |
| dynamicalFormFactorJ2 | 0.00108263 ⓘ |
| epoch | 1980.0 ⓘ |
| equatorialRadius | 6378137.0 m ⓘ |
| flattening | 0.00335281068118 ⓘ |
| flatteningDefinition | (a−b)/a ⓘ |
| fullName | Geodetic Reference System 1980 NERFINISHED ⓘ |
| geocentricGravitationalConstant | 3.986005e14 m^3/s^2 ⓘ |
| hasParameter |
angular velocity
ⓘ
geocentric gravitational constant ⓘ inverse flattening ⓘ normal gravity formula ⓘ semi-major axis ⓘ |
| inverseFlattening | 298.257222101 ⓘ |
| normalGravityAtEquator | 9.7803267715 m/s^2 ⓘ |
| normalGravityAtPole | 9.8321863685 m/s^2 ⓘ |
| polarRadius | 6356752.314140356 m ⓘ |
| referenceFrameUsage | global geodesy ⓘ |
| region | Earth NERFINISHED ⓘ |
| relatedStandard | IAG Geodetic Reference System 1980 resolution NERFINISHED ⓘ |
| replaced | GRS67 ⓘ |
| scope | global ⓘ |
| semiMajorAxis | 6378137.0 m ⓘ |
| semiMajorAxisUnit | metre ⓘ |
| semiMinorAxis | 6356752.314140356 m ⓘ |
| semiMinorAxisUnit | metre ⓘ |
| similarTo | WGS84 ellipsoid NERFINISHED ⓘ |
| status | current ⓘ |
| symmetry | axisymmetric ⓘ |
| type | oblate spheroid ⓘ |
| usedFor |
coordinate reference systems
ⓘ
geodetic computations ⓘ mapping ⓘ 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: GRS80 Description of subject: 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.
Referenced by (1)
Full triples — surface form annotated when it differs from this entity's canonical label.