International Terrestrial Reference System

E242103

geodetic reference system terrestrial reference system

The International Terrestrial Reference System is a globally standardized, Earth-centered coordinate framework used for precise positioning, navigation, and geodetic measurements.

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All labels observed (7)

Label	Occurrences
International Terrestrial Reference Frame	12
International Terrestrial Reference System canonical	8
Global Geodetic Reference Frame	2
IERS ITRS Centre	1
ITRF	1
ITRF2000	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	IERS ⓘ linked to: International Earth Rotation and Reference Systems Service
abbreviationOfStandardizer	IUGG ⓘ linked to: International Union of Geodesy and Geophysics
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 ⓘ GNSS ⓘ linked to: Global Navigation Satellite System Infrastructure SLR ⓘ VLBI ⓘ linked to: Very Long Baseline Interferometry
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	ITRF2014 ⓘ linked to: International Terrestrial Reference System ITRF2020 ⓘ
realizedBy	International Terrestrial Reference Frame ⓘ linked to: International Terrestrial Reference System
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