San Bernardino meridian
E9583
The San Bernardino meridian is a principal survey meridian used as a reference line for land surveying and mapping in Southern California and parts of Nevada.
All labels observed (4)
| Label | Occurrences |
|---|---|
| San Bernardino meridian canonical | 2 |
| California principal meridian | 1 |
| San Bernardino Base Line | 1 |
| San Bernardino Principal Meridian | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T71560 — 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: San Bernardino meridian Context triple: [California–Nevada border, hasCoordinateReference, San Bernardino meridian]
-
A.
Mount Diablo meridian
The Mount Diablo meridian is a principal survey meridian in California used as a reference line for land surveying and mapping across much of the state and parts of Nevada.
-
B.
Tropic of Cancer
The Tropic of Cancer is the northernmost latitude on Earth where the sun can appear directly overhead, marking the boundary of the tropical zone in the Northern Hemisphere.
-
C.
Tropic of Capricorn
The Tropic of Capricorn is the southernmost latitude where the sun can appear directly overhead, marking an important boundary of the Earth's tropical zone.
-
D.
Equator
The Equator is an imaginary line encircling the Earth at equal distance from the poles, dividing the planet into Northern and Southern Hemispheres and marking 0° latitude.
-
E.
Paso de San Francisco
Paso de San Francisco is a high-altitude Andean mountain pass on the Argentina–Chile border, known as a key access route to the Ojos del Salado volcano and surrounding desert landscapes.
- 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: San Bernardino meridian Target entity description: The San Bernardino meridian is a principal survey meridian used as a reference line for land surveying and mapping in Southern California and parts of Nevada.
-
A.
Mount Diablo meridian
The Mount Diablo meridian is a principal survey meridian in California used as a reference line for land surveying and mapping across much of the state and parts of Nevada.
-
B.
Tropic of Cancer
The Tropic of Cancer is the northernmost latitude on Earth where the sun can appear directly overhead, marking the boundary of the tropical zone in the Northern Hemisphere.
-
C.
Tropic of Capricorn
The Tropic of Capricorn is the southernmost latitude where the sun can appear directly overhead, marking an important boundary of the Earth's tropical zone.
-
D.
Equator
The Equator is an imaginary line encircling the Earth at equal distance from the poles, dividing the planet into Northern and Southern Hemispheres and marking 0° latitude.
-
E.
Paso de San Francisco
Paso de San Francisco is a high-altitude Andean mountain pass on the Argentina–Chile border, known as a key access route to the Ojos del Salado volcano and surrounding desert landscapes.
- F. None of above. chosen
Statements (28)
| Predicate | Object |
|---|---|
| instanceOf |
principal meridian
ⓘ
survey meridian ⓘ |
| appliesToRegion |
Southern California
ⓘ
parts of Nevada ⓘ |
| coordinateSystemRole |
basis for township and range surveys
ⓘ
reference line for land descriptions ⓘ |
| country |
United States
ⓘ
linked to:
United States of America
|
| governingAuthority |
United States Bureau of Land Management
ⓘ
linked to:
U.S. Bureau of Land Management
|
| hasMeridianCategory |
California principal meridian
ⓘ
linked to:
San Bernardino meridian
|
| hasNameOrigin |
San Bernardino, California
ⓘ
linked to:
San Bernardino
|
| hasType | principal survey meridian ⓘ |
| isReferenceFor |
federal land surveys in its region
ⓘ
range boundaries in Southern California ⓘ township boundaries in Southern California ⓘ |
| locatedIn |
California
ⓘ
linked to:
California, United States
Nevada ⓘ |
| partOf | network of principal meridians in the United States ⓘ |
| referenceSystem | Public Land Survey System ⓘ |
| system |
United States rectangular survey system
ⓘ
linked to:
Public Land Survey System
|
| usedBy |
land managers
ⓘ
mapping agencies ⓘ surveyors ⓘ |
| usedFor |
cadastral surveying
ⓘ
land surveying ⓘ public land survey system ⓘ |
| usedInDiscipline |
cartography
ⓘ
geodesy ⓘ land administration ⓘ |
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: San Bernardino meridian Description of subject: The San Bernardino meridian is a principal survey meridian used as a reference line for land surveying and mapping in Southern California and parts of Nevada.
Referenced by (5)
Full triples — surface form annotated when it differs from this entity's canonical label.
linked to: San Bernardino meridian
linked to: San Bernardino meridian
linked to: San Bernardino meridian