| snippet:
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The National Hydrography Dataset combines elements of the DLG and RF3: spatial
accuracy and comprehensiveness from the DLG and network relationships, names,
stream level, and a unique identifier (reach code) for surface water features
from RF3. The NHD supersedes DLG and RF3 by incorporating them, not by
replacing them. Users of DLG and RF3 will find the National Hydrography Dataset
both familiar and greatly expanded and refined. The NHD provides a national
framework for assigning reach addresses to water-related entities, such as
industrial dischargers, drinking water supplies, fish habitat areas, wild and
scenic rivers. Reach addresses establish the locations of these entities
relative to one another within the NHD surface water drainage network in a
manner similar to street addresses. Once linked to the NHD by their reach
addresses, the upstream/downstream relationships of these water-related
entities and any associated information about them can be analyzed using
software tools ranging from spreadsheets to geographic information systems
(GIS). GIS can also be used to combine NHD-based network analysis with other
data layers, such as soils, land use and population, to help better understand
and display their respective effects upon one another. Furthermore, because the
NHD provides a nationally consistent framework for addressing and analysis,
water-related information linked to reach addresses by one organization
(national, state, local) can be shared with other organizations and easily
integrated into many different types of applications to the benefit of all. The
National Hydrography Dataset is designed to provide comprehensive coverage of
hydrologic data for the U.S. While initially based on 1:100,000-scale data, the
NHD is designed to incorporate - and encourage the development of -
higher-resolution data required by many users. It will facilitate the improved
integration of water-related data in support of the application requirements of
a growing national user community and... |
| summary:
|
The National Hydrography Dataset combines elements of the DLG and RF3: spatial
accuracy and comprehensiveness from the DLG and network relationships, names,
stream level, and a unique identifier (reach code) for surface water features
from RF3. The NHD supersedes DLG and RF3 by incorporating them, not by
replacing them. Users of DLG and RF3 will find the National Hydrography Dataset
both familiar and greatly expanded and refined. The NHD provides a national
framework for assigning reach addresses to water-related entities, such as
industrial dischargers, drinking water supplies, fish habitat areas, wild and
scenic rivers. Reach addresses establish the locations of these entities
relative to one another within the NHD surface water drainage network in a
manner similar to street addresses. Once linked to the NHD by their reach
addresses, the upstream/downstream relationships of these water-related
entities and any associated information about them can be analyzed using
software tools ranging from spreadsheets to geographic information systems
(GIS). GIS can also be used to combine NHD-based network analysis with other
data layers, such as soils, land use and population, to help better understand
and display their respective effects upon one another. Furthermore, because the
NHD provides a nationally consistent framework for addressing and analysis,
water-related information linked to reach addresses by one organization
(national, state, local) can be shared with other organizations and easily
integrated into many different types of applications to the benefit of all. The
National Hydrography Dataset is designed to provide comprehensive coverage of
hydrologic data for the U.S. While initially based on 1:100,000-scale data, the
NHD is designed to incorporate - and encourage the development of -
higher-resolution data required by many users. It will facilitate the improved
integration of water-related data in support of the application requirements of
a growing national user community and... |
| accessInformation:
|
The names and definitions of all feature types, characteristics, and values are
in U.S. Geological Survey, 1999, Standards for National Hydrography Dataset:
Reston, Virginia, U.S.Geological Survey. The document is available online
through http://mapping.usgs.gov/standards/. Information about tables and fields
in the data are available from the user documentation for the National
Hydrography Dataset; Retrieved in 2020 from USGS TNM Downloader: https://apps.nationalmap.gov/downloader/#/ |
| thumbnail:
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| maxScale:
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NaN |
| typeKeywords:
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[] |
| description:
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The National Hydrography Dataset (NHD) is a feature-based database that interconnects and uniquely identifies the stream segments or reaches that comprise the nations surface water drainage system. It is based initially on the content of the U.S. Geological Survey 1:100,000-scale Digital Line Graph (DLG) hydrography data, integrated with reach-related information from the U.S. Environmental Protection Agency Reach File Version 3.0 (RF3). More specifically, it contains reach codes for networked features and isolated lakes, flow direction, names, stream level, and centerline representations for areal water bodies. Reaches are also defined to represent waterbodies and the approximate shorelines of the Great Lakes, the Atlantic and Pacific Oceans, and the Gulf of Mexico. The NHD also incorporates the National Spatial Data Infrastructure framework criteria set out by the Federal Geographic Data Committee. |
| licenseInfo:
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None. Acknowledgment of the originating agencies would be appreciated in products derived from these data. |
| catalogPath:
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| title:
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National Hydrology Dataset (NHD) Flowlines |
| type:
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| url:
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| tags:
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["Hydrography","Stream","River","Lake","Pond","Canal","Ditch","Reservoir","Spring","Seep","Swamp","March","Artificial Path","Reach"] |
| culture:
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en-US |
| portalUrl:
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| name:
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| guid:
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| minScale:
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NaN |
| spatialReference:
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