Great Trigonometrical Survey of India
E54302
The Great Trigonometrical Survey of India was a 19th-century British surveying project that precisely mapped the Indian subcontinent and measured major peaks of the Himalayas, including identifying and calculating the heights of mountains such as K2 and Everest.
All labels observed (2)
| Label | Occurrences |
|---|---|
| Great Trigonometrical Survey of India canonical | 13 |
| Bengal Survey | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T427484 — 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: Great Trigonometrical Survey of India Context triple: [K2, namedDuring, Great Trigonometrical Survey of India]
-
A.
Kisan Ghat
Kisan Ghat is a memorial in Delhi dedicated to Indian farmers, located near the Raj Ghat complex.
-
B.
Kamarajar Salai
Kamarajar Salai is a prominent seaside arterial road in Chennai, India, running along the Marina Beach and hosting several important educational and governmental landmarks.
-
C.
Ghat
Ghat is a remote oasis town in southwestern Libya, historically significant as a Saharan caravan hub and gateway to the surrounding desert landscapes.
-
D.
India Gate
India Gate is a prominent war memorial in New Delhi, India, commemorating Indian soldiers who died in World War I and other conflicts.
-
E.
Jantar Mantar, New Delhi
Jantar Mantar, New Delhi is an 18th-century astronomical observatory built by Maharaja Jai Singh II, featuring large masonry instruments used for precise naked-eye observations of celestial bodies.
- 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: Great Trigonometrical Survey of India Target entity description: The Great Trigonometrical Survey of India was a 19th-century British surveying project that precisely mapped the Indian subcontinent and measured major peaks of the Himalayas, including identifying and calculating the heights of mountains such as K2 and Everest.
-
A.
Kisan Ghat
Kisan Ghat is a memorial in Delhi dedicated to Indian farmers, located near the Raj Ghat complex.
-
B.
Kamarajar Salai
Kamarajar Salai is a prominent seaside arterial road in Chennai, India, running along the Marina Beach and hosting several important educational and governmental landmarks.
-
C.
Ghat
Ghat is a remote oasis town in southwestern Libya, historically significant as a Saharan caravan hub and gateway to the surrounding desert landscapes.
-
D.
India Gate
India Gate is a prominent war memorial in New Delhi, India, commemorating Indian soldiers who died in World War I and other conflicts.
-
E.
Jantar Mantar, New Delhi
Jantar Mantar, New Delhi is an 18th-century astronomical observatory built by Maharaja Jai Singh II, featuring large masonry instruments used for precise naked-eye observations of celestial bodies.
- F. None of above. chosen
Statements (49)
| Predicate | Object |
|---|---|
| instanceOf |
British colonial project
ⓘ
geodetic survey ⓘ scientific expedition ⓘ |
| beganUnder | William Lambton ⓘ |
| chiefSurveyor |
Andrew Scott Waugh
ⓘ
George Everest ⓘ William Lambton ⓘ |
| continuedBy |
Government of British India
ⓘ
surface form:
British Raj government
|
| contributedTo |
definition of Indian standard datum
ⓘ
development of modern cartography in South Asia ⓘ global understanding of Earth’s shape ⓘ mapping of India on a uniform scale ⓘ |
| country | British India ⓘ |
| determinedHeightOf |
K2
ⓘ
Kangchenjunga ⓘ Mount Everest ⓘ |
| endTime | 1870s ⓘ |
| field |
cartography
ⓘ
geodesy ⓘ topographic surveying ⓘ |
| identifiedAsHighestPeak | Mount Everest ⓘ |
| initiatedBy | British East India Company ⓘ |
| laterDirectedBy |
Andrew Scott Waugh
ⓘ
George Everest ⓘ |
| legacy |
foundation of modern Survey of India maps
ⓘ
naming of Mount Everest after George Everest ⓘ |
| location | Indian subcontinent ⓘ |
| measured |
K2
ⓘ
Kangchenjunga ⓘ Mount Everest ⓘ Nanda Devi ⓘ |
| notableFeature |
measurement of a meridional arc over India
ⓘ
network of triangulation stations across India ⓘ |
| notableWork |
Great Arc of the Meridian
ⓘ
measurement of Himalayan peaks ⓘ measurement of K2 ⓘ measurement of Mount Everest ⓘ |
| operator | Survey of India ⓘ |
| originalNameOfEverest | Peak XV ⓘ |
| purpose |
establishing a geodetic framework for India
ⓘ
measurement of heights of Himalayan peaks ⓘ measurement of the curvature of the Earth ⓘ precise mapping of the Indian subcontinent ⓘ |
| scale | subcontinental ⓘ |
| startTime | 1802 ⓘ |
| usedInstrument |
baseline measuring apparatus
ⓘ
theodolite ⓘ |
| usedMethod |
geodetic surveying
ⓘ
triangulation ⓘ |
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: Great Trigonometrical Survey of India Description of subject: The Great Trigonometrical Survey of India was a 19th-century British surveying project that precisely mapped the Indian subcontinent and measured major peaks of the Himalayas, including identifying and calculating the heights of mountains such as K2 and Everest.
Referenced by (14)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
Bengal Survey