Cobb Estate
E368437
Cobb Estate is a historic property and popular hiking trailhead in Altadena, California, known for its ruins, wooded grounds, and access to the Sam Merrill Trail into the San Gabriel Mountains.
All labels observed (1)
| Label | Occurrences |
|---|---|
| Cobb Estate canonical | 2 |
How this entity was disambiguated
This entity first appeared as the object of triple T3554540 — 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: Cobb Estate Context triple: [Altadena, hasLandmark, Cobb Estate]
-
A.
Brooks Estate
Brooks Estate is a historic 19th-century estate and conservation area in Medford, Massachusetts, known for its preserved mansion, carriage house, and surrounding open space.
-
B.
Isabella Plantation
Isabella Plantation is a renowned ornamental woodland garden in London’s Richmond Park, celebrated for its vibrant azaleas, rhododendrons, and tranquil ponds.
-
C.
Stately Oaks Plantation
Stately Oaks Plantation is a historic antebellum home and museum in Jonesboro, Georgia, known for its Greek Revival architecture and ties to the Old South.
-
D.
Shadwell plantation
Shadwell plantation was the 18th-century Virginia estate best known as the birthplace and early home of Thomas Jefferson.
-
E.
Landsford Plantation
Landsford Plantation was a historic Southern plantation estate in South Carolina associated with Revolutionary War officer and statesman William R. Davie.
- 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: Cobb Estate Target entity description: Cobb Estate is a historic property and popular hiking trailhead in Altadena, California, known for its ruins, wooded grounds, and access to the Sam Merrill Trail into the San Gabriel Mountains.
-
A.
Brooks Estate
Brooks Estate is a historic 19th-century estate and conservation area in Medford, Massachusetts, known for its preserved mansion, carriage house, and surrounding open space.
-
B.
Isabella Plantation
Isabella Plantation is a renowned ornamental woodland garden in London’s Richmond Park, celebrated for its vibrant azaleas, rhododendrons, and tranquil ponds.
-
C.
Stately Oaks Plantation
Stately Oaks Plantation is a historic antebellum home and museum in Jonesboro, Georgia, known for its Greek Revival architecture and ties to the Old South.
-
D.
Shadwell plantation
Shadwell plantation was the 18th-century Virginia estate best known as the birthplace and early home of Thomas Jefferson.
-
E.
Landsford Plantation
Landsford Plantation was a historic Southern plantation estate in South Carolina associated with Revolutionary War officer and statesman William R. Davie.
- F. None of above. chosen
Statements (47)
| Predicate | Object |
|---|---|
| instanceOf |
hiking trailhead
ⓘ
historic estate ⓘ public open space ⓘ |
| accesses |
Echo Mountain
NERFINISHED
ⓘ
Inspiration Point (San Gabriel Mountains) ⓘ |
| atFootOf | San Gabriel Mountains ⓘ |
| category |
Altadena, California, United States
ⓘ
surface form:
Altadena, California
Hiking trails in California ⓘ Parks in Los Angeles County, California ⓘ San Gabriel Mountains ⓘ |
| country |
United States of America
ⓘ
surface form:
United States
|
| hasFeature |
network of informal paths
ⓘ
parking area at trailhead ⓘ ruins of former mansion ⓘ stone entry gate ⓘ wooded grounds ⓘ |
| hasUse |
hiking
ⓘ
historical exploration ⓘ nature observation ⓘ recreation ⓘ |
| hasVegetation |
chaparral shrubs
ⓘ
oak trees ⓘ pine trees ⓘ |
| historicalUse |
private estate
ⓘ
residential mansion grounds ⓘ |
| locatedIn |
Altadena, California, United States
ⓘ
surface form:
Altadena, California
Los Angeles County ⓘ
surface form:
Los Angeles County, California
United States of America ⓘ
surface form:
United States
|
| managedAs | public open space ⓘ |
| near | Angeles National Forest boundary ⓘ |
| notableFor | gateway to Sam Merrill Trail into the San Gabriel Mountains ⓘ |
| openTo |
dog walkers
ⓘ
general public ⓘ hikers ⓘ |
| overlooks | Los Angeles Basin ⓘ |
| ownedBy | U.S. Forest Service ⓘ |
| partOf | front range of the San Gabriel Mountains ⓘ |
| popularFor |
local neighborhood walks
ⓘ
night hiking ⓘ sunset views ⓘ |
| region | San Gabriel Valley ⓘ |
| status | ruins of former built structures ⓘ |
| streetAccess | Lake Avenue, Altadena ⓘ |
| trailConnectsTo |
Echo Mountain ruins
ⓘ
Inspiration Point trail network ⓘ |
| trailheadFor | Sam Merrill Trail ⓘ |
| trailSystem |
Sam Merrill Trail
ⓘ
surface form:
Sam Merrill Trail 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: Cobb Estate Description of subject: Cobb Estate is a historic property and popular hiking trailhead in Altadena, California, known for its ruins, wooded grounds, and access to the Sam Merrill Trail into the San Gabriel Mountains.
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.
subject surface form:
Altadena, California