Ordnance Survey trig pillar
E513602
An Ordnance Survey trig pillar is a concrete triangulation point used in the United Kingdom’s national mapping system to provide precise reference locations for surveying and map-making.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Ordnance Survey trig pillar canonical | 2 |
How this entity was disambiguated
This entity first appeared as the object of triple T5344280 — 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: Ordnance Survey trig pillar Context triple: [Kinder Low, mapFeature, Ordnance Survey trig pillar]
-
A.
Nelson's Pillar
Nelson's Pillar was a prominent 19th-century monument in central Dublin, dedicated to Admiral Horatio Nelson and later destroyed in 1966.
-
B.
Wainhouse Tower
Wainhouse Tower is a prominent Victorian-era folly and observation tower in Halifax, England, noted for its ornate design and status as one of the tallest structures of its kind in the world.
-
C.
Ward's Stone
Ward's Stone is a prominent gritstone fell in Lancashire, England, known for its expansive moorland plateau and extensive views over the surrounding countryside.
-
D.
Ayer Mill Clock Tower
The Ayer Mill Clock Tower is a historic mill clock tower in Lawrence, Massachusetts, known for its large clock faces and as a prominent symbol of the city’s industrial past.
-
E.
Folkestone White Horse
Folkestone White Horse is a large hillside chalk figure of a horse carved into Cheriton Hill overlooking the town of Folkestone in Kent, England.
- 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: Ordnance Survey trig pillar Target entity description: An Ordnance Survey trig pillar is a concrete triangulation point used in the United Kingdom’s national mapping system to provide precise reference locations for surveying and map-making.
-
A.
Nelson's Pillar
Nelson's Pillar was a prominent 19th-century monument in central Dublin, dedicated to Admiral Horatio Nelson and later destroyed in 1966.
-
B.
Wainhouse Tower
Wainhouse Tower is a prominent Victorian-era folly and observation tower in Halifax, England, noted for its ornate design and status as one of the tallest structures of its kind in the world.
-
C.
Ward's Stone
Ward's Stone is a prominent gritstone fell in Lancashire, England, known for its expansive moorland plateau and extensive views over the surrounding countryside.
-
D.
Ayer Mill Clock Tower
The Ayer Mill Clock Tower is a historic mill clock tower in Lawrence, Massachusetts, known for its large clock faces and as a prominent symbol of the city’s industrial past.
-
E.
Folkestone White Horse
Folkestone White Horse is a large hillside chalk figure of a horse carved into Cheriton Hill overlooking the town of Folkestone in Kent, England.
- F. None of above. chosen
Statements (49)
| Predicate | Object |
|---|---|
| instanceOf |
concrete pillar
ⓘ
geodetic triangulation station ⓘ survey marker ⓘ |
| constructedFor | Retriangulation of Great Britain ⓘ |
| coordinateSystem | British National Grid ⓘ |
| country | United Kingdom ⓘ |
| documentedIn |
Ordnance Survey databases
ⓘ
linked to:
Ordnance Survey
trigpointing websites ⓘ |
| foundIn |
England
ⓘ
Isle of Man ⓘ
linked to:
Isle of Man (crown dependency)
Northern Ireland ⓘ Scotland ⓘ Wales ⓘ |
| hasAlternativeName |
triangulation pillar
ⓘ
trig pillar ⓘ trig point ⓘ |
| hasComponent |
brass flush bracket
ⓘ
central mark ⓘ mounting plate for theodolite ⓘ triangulation plate ⓘ |
| hasFunction |
define fixed survey control points
ⓘ
enable accurate angle measurement between stations ⓘ |
| hasIdentifier |
OS trig number
ⓘ
flush bracket number ⓘ |
| hasPurpose |
geodetic control
ⓘ
map-making ⓘ surveying ⓘ triangulation ⓘ |
| hasShape | truncated square pyramid ⓘ |
| hasTopFeature |
metal mounting plate with three threaded holes
ⓘ
reference mark for instrument centring ⓘ |
| heritageStatus | many examples considered historic structures ⓘ |
| introducedIn | 1930s ⓘ |
| locatedOn |
hilltops
ⓘ
mountain summits ⓘ prominent landscape points ⓘ |
| material | concrete ⓘ |
| networkType | first-order triangulation network ⓘ |
| partOf | Ordnance Survey national triangulation network ⓘ |
| replacedBy | GPS survey control ⓘ |
| status | largely superseded by satellite geodesy ⓘ |
| typicalBaseWidth | about 0.8 metres ⓘ |
| typicalHeight | about 1.2 metres ⓘ |
| usedBy | Ordnance Survey ⓘ |
| usedWith |
optical plummet
ⓘ
theodolite ⓘ |
| visitedBy |
hillwalkers
ⓘ
trigpoint enthusiasts ⓘ walkers ⓘ |
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: Ordnance Survey trig pillar Description of subject: An Ordnance Survey trig pillar is a concrete triangulation point used in the United Kingdom’s national mapping system to provide precise reference locations for surveying and map-making.
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.