Mount Diablo meridian
E6889
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.
All labels observed (5)
| Label | Occurrences |
|---|---|
| Mount Diablo Base Line | 1 |
| Mount Diablo Principal Meridian | 1 |
| Mount Diablo baseline | 1 |
| Mount Diablo initial point monument | 1 |
| Mount Diablo meridian canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T71559 — 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: Mount Diablo meridian Context triple: [California–Nevada border, hasCoordinateReference, Mount Diablo meridian]
-
A.
Carson Pass
Carson Pass is a high mountain pass in California’s central Sierra Nevada, known for its scenic alpine landscapes, hiking trails, and historic role as a route for emigrant wagon trains.
-
B.
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.
-
C.
Donner Pass
Donner Pass is a historically significant mountain pass in California’s Sierra Nevada, known for its challenging terrain, transcontinental railroad route, and the ill-fated Donner Party.
-
D.
Tioga Pass
Tioga Pass is a high mountain pass in California’s Sierra Nevada, best known as the eastern entrance to Yosemite National Park and one of the highest paved roads in the state.
-
E.
Nevada Fall
Nevada Fall is a prominent and picturesque waterfall on the Merced River in Yosemite National Park, known for its powerful drop and dramatic granite surroundings.
- 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: Mount Diablo meridian Target entity description: 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.
-
A.
Carson Pass
Carson Pass is a high mountain pass in California’s central Sierra Nevada, known for its scenic alpine landscapes, hiking trails, and historic role as a route for emigrant wagon trains.
-
B.
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.
-
C.
Donner Pass
Donner Pass is a historically significant mountain pass in California’s Sierra Nevada, known for its challenging terrain, transcontinental railroad route, and the ill-fated Donner Party.
-
D.
Tioga Pass
Tioga Pass is a high mountain pass in California’s Sierra Nevada, best known as the eastern entrance to Yosemite National Park and one of the highest paved roads in the state.
-
E.
Nevada Fall
Nevada Fall is a prominent and picturesque waterfall on the Merced River in Yosemite National Park, known for its powerful drop and dramatic granite surroundings.
- F. None of above. chosen
Statements (45)
| Predicate | Object |
|---|---|
| instanceOf |
principal meridian
ⓘ
survey meridian ⓘ |
| appliesTo |
certain private lands derived from federal patents
ⓘ
public lands in California ⓘ |
| associatedBaseline |
Mount Diablo meridian
self-linksurface differs
ⓘ
surface form:
Mount Diablo baseline
|
| coordinateSystem |
Public Land Survey System
ⓘ
surface form:
Public Land Survey System rectangular survey
|
| country |
United States of America
ⓘ
surface form:
United States
|
| coversRegion |
large parts of central California
ⓘ
most of northern California ⓘ western Nevada ⓘ |
| datumRelation | tied to Mount Diablo initial point monument ⓘ |
| establishedFor |
legal land descriptions
ⓘ
subdivision of public lands ⓘ |
| governingAgency |
U.S. Bureau of Land Management
ⓘ
surface form:
United States Bureau of Land Management
|
| hasInitialPointMonument |
Mount Diablo meridian
self-linksurface differs
ⓘ
surface form:
Mount Diablo initial point monument
|
| initialPoint | Mount Diablo ⓘ |
| initialPointLocatedIn |
Contra Costa County
ⓘ
surface form:
Contra Costa County, California
|
| jurisdiction |
California, United States
ⓘ
surface form:
State of California
Nevada ⓘ
surface form:
State of Nevada
|
| legalSignificance |
controls description of federal land patents in its area
ⓘ
referenced in deeds and land titles ⓘ |
| locatedIn |
California, United States
ⓘ
surface form:
California
|
| mapRepresentation |
shown on BLM cadastral maps
ⓘ
shown on USGS topographic maps ⓘ |
| namingReason | named after Mount Diablo ⓘ |
| partOf | Public Land Survey System ⓘ |
| principalMeridianNumber | 37 ⓘ |
| referenceFor |
land surveying in California
ⓘ
land surveying in parts of Nevada ⓘ mapping in California ⓘ mapping in parts of Nevada ⓘ |
| relatedTo |
Humboldt meridian
ⓘ
San Bernardino meridian ⓘ |
| surveySystemType | rectangular survey system ⓘ |
| systemRole |
origin for range numbering in its survey area
ⓘ
origin for township numbering in its survey area ⓘ |
| usedBy |
cartographers
ⓘ
government land agencies ⓘ land surveyors ⓘ title companies ⓘ |
| usedFor |
cadastral mapping
ⓘ
property boundary definition ⓘ township and range descriptions ⓘ |
| usedIn |
California land survey system
ⓘ
Nevada land survey system ⓘ |
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: Mount Diablo meridian Description of subject: 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.
Referenced by (5)
Full triples — surface form annotated when it differs from this entity's canonical label.
this entity surface form:
Mount Diablo baseline
this entity surface form:
Mount Diablo initial point monument
this entity surface form:
Mount Diablo Principal Meridian
this entity surface form:
Mount Diablo Base Line