International Terrestrial Reference System
E242103
The International Terrestrial Reference System is a globally standardized, Earth-centered coordinate framework used for precise positioning, navigation, and geodetic measurements.
All labels observed (5)
| Label | Occurrences |
|---|---|
| International Terrestrial Reference Frame | 4 |
| International Terrestrial Reference System canonical | 3 |
| Global Geodetic Reference Frame | 1 |
| IERS ITRS Centre | 1 |
| ITRF2014 | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T2184512 — 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: International Terrestrial Reference System Context triple: [International Earth Rotation and Reference Systems Service, maintains, International Terrestrial Reference System]
-
A.
International Earth Rotation and Reference Systems Service
The International Earth Rotation and Reference Systems Service (IERS) is an international organization that monitors Earth's rotation and maintains global reference systems used for precise timekeeping, navigation, and geodesy.
-
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.
WGS84
WGS84 is the global geodetic reference system and standard coordinate framework used for GPS and most modern mapping applications.
-
D.
Terrestrial Time
Terrestrial Time is a modern astronomical time standard used for precise calculations of planetary motion and ephemerides, defined in relation to atomic time rather than Earth's rotation.
-
E.
International Atomic Time
International Atomic Time is a high-precision time standard based on the combined output of atomic clocks worldwide, serving as the fundamental reference for modern civil and scientific timekeeping.
- 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: International Terrestrial Reference System Target entity description: The International Terrestrial Reference System is a globally standardized, Earth-centered coordinate framework used for precise positioning, navigation, and geodetic measurements.
-
A.
International Earth Rotation and Reference Systems Service
The International Earth Rotation and Reference Systems Service (IERS) is an international organization that monitors Earth's rotation and maintains global reference systems used for precise timekeeping, navigation, and geodesy.
-
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.
WGS84
WGS84 is the global geodetic reference system and standard coordinate framework used for GPS and most modern mapping applications.
-
D.
Terrestrial Time
Terrestrial Time is a modern astronomical time standard used for precise calculations of planetary motion and ephemerides, defined in relation to atomic time rather than Earth's rotation.
-
E.
International Atomic Time
International Atomic Time is a high-precision time standard based on the combined output of atomic clocks worldwide, serving as the fundamental reference for modern civil and scientific timekeeping.
- F. None of above. chosen
Statements (47)
| Predicate | Object |
|---|---|
| instanceOf |
geodetic reference system
ⓘ
terrestrial reference system ⓘ |
| abbreviation | ITRS ⓘ |
| abbreviationOfMaintainer |
International Earth Rotation and Reference Systems Service
ⓘ
surface form:
IERS
|
| abbreviationOfStandardizer |
International Union of Geodesy and Geophysics
ⓘ
surface form:
IUGG
|
| accuracyGoal | millimeter-level stability ⓘ |
| axisOrientation |
X axis pointing to intersection of equator and Greenwich meridian
ⓘ
Y axis completing right-handed system ⓘ Z axis aligned with mean Earth rotation axis ⓘ |
| category |
geodesy
ⓘ
reference systems ⓘ |
| coordinateAxes | X axis, Y axis, Z axis ⓘ |
| coordinateCenter | Earth’s center of mass ⓘ |
| coordinateType | Cartesian coordinates ⓘ |
| dataSources |
DORIS
ⓘ
Global Navigation Satellite System Infrastructure ⓘ
surface form:
GNSS
SLR ⓘ Very Long Baseline Interferometry ⓘ
surface form:
VLBI
|
| definedIn | IERS Conventions ⓘ |
| defines | global geocentric coordinate system ⓘ |
| dimension | three-dimensional ⓘ |
| hasOfficialWebsite | https://www.iers.org ⓘ |
| maintainedBy | International Earth Rotation and Reference Systems Service ⓘ |
| realizationExample |
International Terrestrial Reference System
self-linksurface differs
ⓘ
surface form:
ITRF2014
ITRF2020 ⓘ |
| realizedBy |
International Terrestrial Reference System
self-linksurface differs
ⓘ
surface form:
International Terrestrial Reference Frame
|
| referenceEpoch | defined at a conventional reference epoch ⓘ |
| referenceFrameType | Earth-centered Earth-fixed ⓘ |
| relatedSystem | International Celestial Reference System ⓘ |
| scaleDefinition | consistent with relativistic space-time conventions ⓘ |
| scope | global ⓘ |
| standardizedBy | International Union of Geodesy and Geophysics ⓘ |
| supports |
Earth system science
ⓘ
climate change monitoring ⓘ global geodetic observing system ⓘ |
| timeEvolutionModel |
accounts for Earth deformation
ⓘ
accounts for tectonic plate motion ⓘ accounts for tidal effects ⓘ |
| transformationTo | International Celestial Reference System ⓘ |
| usedFor |
Earth observation
ⓘ
GNSS positioning ⓘ geodetic measurements ⓘ navigation ⓘ precise positioning ⓘ satellite orbit determination ⓘ sea level monitoring ⓘ tectonic plate motion studies ⓘ |
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: International Terrestrial Reference System Description of subject: The International Terrestrial Reference System is a globally standardized, Earth-centered coordinate framework used for precise positioning, navigation, and geodetic measurements.
Referenced by (10)
Full triples — surface form annotated when it differs from this entity's canonical label.
International Earth Rotation and Reference Systems Service
→
maintains
→
International Terrestrial Reference System
ⓘ
International Earth Rotation and Reference Systems Service
→
maintains
→
International Terrestrial Reference System
ⓘ
this entity surface form:
International Terrestrial Reference Frame
International Earth Rotation and Reference Systems Service
→
hasComponent
→
International Terrestrial Reference System
ⓘ
this entity surface form:
IERS ITRS Centre
International Terrestrial Reference System
→
realizedBy
→
International Terrestrial Reference System
self-linksurface differs
ⓘ
this entity surface form:
International Terrestrial Reference Frame
International Terrestrial Reference System
→
realizationExample
→
International Terrestrial Reference System
self-linksurface differs
ⓘ
this entity surface form:
ITRF2014
this entity surface form:
International Terrestrial Reference Frame
this entity surface form:
Global Geodetic Reference Frame
this entity surface form:
International Terrestrial Reference Frame