National Hydrography Dataset
E855112
The National Hydrography Dataset is a comprehensive digital geospatial database that maps the surface water features of the United States, including streams, rivers, lakes, and related hydrologic information for analysis and cartography.
All labels observed (1)
| Label | Occurrences |
|---|---|
| National Hydrography Dataset canonical | 5 |
How this entity was disambiguated
This entity first appeared as the object of triple T10316803 — 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: National Hydrography Dataset Context triple: [United States Geological Survey hydrologic unit codes, partOf, National Hydrography Dataset]
-
A.
National Water Information System
The National Water Information System is a comprehensive U.S. database and platform that provides access to nationwide water resources data, including streamflow, groundwater levels, water quality, and water use.
-
B.
United States Geological Survey hydrologic unit codes
United States Geological Survey hydrologic unit codes are a standardized numerical system used to uniquely identify and organize the nation’s watersheds and drainage basins for hydrologic mapping and analysis.
-
C.
USGS National Map
The USGS National Map is a collaborative, online mapping platform that provides public access to high-quality, nationwide geospatial data and services for visualization, analysis, and download.
-
D.
USGS GloVis
USGS GloVis is an online portal provided by the U.S. Geological Survey for browsing, previewing, and downloading satellite imagery and other Earth observation data.
-
E.
National Water Center
The National Water Center is a research institution in the United Arab Emirates focused on advancing knowledge, technology, and policy for sustainable water resources management in arid regions.
- 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: National Hydrography Dataset Target entity description: The National Hydrography Dataset is a comprehensive digital geospatial database that maps the surface water features of the United States, including streams, rivers, lakes, and related hydrologic information for analysis and cartography.
-
A.
National Water Information System
The National Water Information System is a comprehensive U.S. database and platform that provides access to nationwide water resources data, including streamflow, groundwater levels, water quality, and water use.
-
B.
United States Geological Survey hydrologic unit codes
United States Geological Survey hydrologic unit codes are a standardized numerical system used to uniquely identify and organize the nation’s watersheds and drainage basins for hydrologic mapping and analysis.
-
C.
USGS National Map
The USGS National Map is a collaborative, online mapping platform that provides public access to high-quality, nationwide geospatial data and services for visualization, analysis, and download.
-
D.
USGS GloVis
USGS GloVis is an online portal provided by the U.S. Geological Survey for browsing, previewing, and downloading satellite imagery and other Earth observation data.
-
E.
National Water Center
The National Water Center is a research institution in the United Arab Emirates focused on advancing knowledge, technology, and policy for sustainable water resources management in arid regions.
- F. None of above. chosen
Statements (84)
| Predicate | Object |
|---|---|
| instanceOf |
United States government dataset
ⓘ
geospatial database ⓘ hydrographic dataset ⓘ |
| accessURL | https://www.usgs.gov/national-hydrography ⓘ |
| acronym | NHD ⓘ |
| containsAttribute |
GNIS identifiers
ⓘ
feature names ⓘ feature types ⓘ flow direction ⓘ flow network connectivity ⓘ permanent identifiers ⓘ reach codes ⓘ |
| coordinateReferenceSystem | geographic coordinates ⓘ |
| country |
United States
ⓘ
linked to:
United States of America
|
| coverageArea |
Alaska
ⓘ
Hawaii ⓘ Puerto Rico ⓘ U.S. Virgin Islands ⓘ conterminous United States ⓘ
linked to:
contiguous United States
other U.S. territories ⓘ |
| dataAccess | free ⓘ |
| dataFormat |
file geodatabase
ⓘ
geodatabase ⓘ shapefile ⓘ web services ⓘ |
| dataModel | feature-based vector model ⓘ |
| describes | surface water features ⓘ |
| developer | United States Geological Survey ⓘ |
| governedBy | USGS data standards ⓘ |
| hasScale |
1:100,000
ⓘ
1:2,000,000 ⓘ 1:24,000 ⓘ |
| includesFeatureType |
area features
ⓘ
artificial paths ⓘ bays ⓘ canals ⓘ coastline segments ⓘ dams ⓘ ditches ⓘ estuaries ⓘ flowlines ⓘ glaciers ⓘ hydrologic units ⓘ ice masses ⓘ inlets ⓘ lakes ⓘ levees ⓘ linear features ⓘ locks ⓘ marshes ⓘ outfalls ⓘ playas ⓘ point features ⓘ ponds ⓘ rapids ⓘ reservoirs ⓘ rivers ⓘ springs ⓘ streamgages ⓘ streams ⓘ swamps ⓘ water intakes ⓘ waterbodies ⓘ waterfalls ⓘ wells ⓘ |
| isPartOf |
National Map
ⓘ
linked to:
USGS National Map
|
| isRelatedTo |
NHDPlus
ⓘ
National Elevation Dataset ⓘ Watershed Boundary Dataset ⓘ |
| license | public domain ⓘ |
| publisher | United States Geological Survey ⓘ |
| supportsUseCase |
cartography
ⓘ
environmental management ⓘ flood risk assessment ⓘ hydrologic analysis ⓘ resource planning ⓘ water quality modeling ⓘ watershed delineation ⓘ |
| updateFrequency | periodic ⓘ |
| usedBy |
federal agencies
ⓘ
local governments ⓘ private sector ⓘ researchers ⓘ state agencies ⓘ |
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: National Hydrography Dataset Description of subject: The National Hydrography Dataset is a comprehensive digital geospatial database that maps the surface water features of the United States, including streams, rivers, lakes, and related hydrologic information for analysis and cartography.
Referenced by (5)
Full triples — surface form annotated when it differs from this entity's canonical label.