Humboldt meridian
E43870
The Humboldt meridian is a principal survey meridian used as a reference line for land surveying and mapping in parts of northern California.
All labels observed (3)
| Label | Occurrences |
|---|---|
| Humboldt Base Line | 1 |
| Humboldt Principal Meridian | 1 |
| Humboldt meridian canonical | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T343600 — 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: Humboldt meridian Context triple: [Mount Diablo meridian, relatedTo, Humboldt meridian]
-
A.
San Bernardino meridian
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.
-
B.
Prime Meridian
The Prime Meridian is the internationally recognized zero-degree line of longitude from which all other longitudes and global time zones are measured.
-
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.
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.
- 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: Humboldt meridian Target entity description: The Humboldt meridian is a principal survey meridian used as a reference line for land surveying and mapping in parts of northern California.
-
A.
San Bernardino meridian
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.
-
B.
Prime Meridian
The Prime Meridian is the internationally recognized zero-degree line of longitude from which all other longitudes and global time zones are measured.
-
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.
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.
- F. None of above. chosen
Statements (20)
| Predicate | Object |
|---|---|
| instanceOf |
principal meridian
ⓘ
survey meridian ⓘ |
| administeredBy |
Bureau of Land Management
ⓘ
linked to:
U.S. Bureau of Land Management
|
| appliesTo | public lands in northern California ⓘ |
| coordinateSystem | rectangular survey system ⓘ |
| country |
United States
ⓘ
linked to:
United States of America
|
| hasType | north–south line ⓘ |
| isReferenceFor | legal land descriptions in northern California ⓘ |
| locatedIn |
California
ⓘ
linked to:
California, United States
northern California ⓘ |
| namedAfter |
Humboldt County, California
ⓘ
linked to:
Humboldt County
|
| partOf |
California principal meridian network
ⓘ
Public Land Survey System ⓘ |
| referenceLineFor |
range surveys
ⓘ
township surveys ⓘ |
| regionServed |
Humboldt County, California
ⓘ
linked to:
Humboldt County
adjacent areas of northern California ⓘ |
| systemRole | principal reference for cadastral surveys in its region ⓘ |
| usedFor |
land mapping
ⓘ
land surveying ⓘ |
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: Humboldt meridian Description of subject: The Humboldt meridian is a principal survey meridian used as a reference line for land surveying and mapping in parts of northern California.
Referenced by (3)
Full triples — surface form annotated when it differs from this entity's canonical label.
linked to: Humboldt meridian
linked to: Humboldt meridian