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Stewardship of the
National Hydrography Dataset (NHD)
2010 West Virginia GIS ConferenceHuntington, West Virginia – June 9, 2010
Dave ArnoldNHD Partner Support for Region 5
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Origins of the NHD
Nationwide 100K NHD Completed in 2001
EPA Reach File
Version 3 (RF3)Completed in 1992
USGS,EPA, and USFS
Collaborationin 1997
USGS 100K Digital
Line Graph (DLG)Completed in 1988
GeographicNames
InformationSystem (GNIS)
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History of the NHD
• 2002 – USGS, USFS, and others begin work to produce 24K NHD.
• 2003 – Feature Operational Database (FOD) was retired and the enterprise geodatabase came online.
• 2007 – Conversions and conflation of nationwide 24K geodatabase completed.
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From Past to Present
Original Focus of the NHD:
• Defining the data model.
• Building a navigable stream network.
• Creating tools and procedures to enforce the data model.
Current Focus of the NHD:
• Improved accuracy with local resolution data.
• Building the stewardship program.
• Data maintenance.
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The NHD Geodatabase Model
• Expansible model based on the needs of end-users.
• Contains hydrography, hydrologic units, and tables.
• Relationships among tables and features.
• Includes change management to track history.
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Data ModelNHD Model version 1.06, on the left, versus version 2.0, which is still in draft form, but will be released
within in the next few weeks.
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Role of the USGS
• Provides direction and overall management.
• Maintains and develops the NHD model.
• Develops tools to standardize editing of the database.
• Hosts and distributes the database.
• Provides training to the stewards.
• Quality control to enforce national continuity of the dataset.
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Role of the State Stewards
Principal Steward:
• Focal point of stewardship within the state.
• Signatory on the Memorandum of Understanding.
• Approve and submit all NHD updates.
• Interacts directly with the USGS Technical Point of Contact.
Sub-Stewards:
• Provide local knowledge for their area of expertise.
• May edit the NHD and submit it through the principal steward.
• Offer input on improvements for the NHD.
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Role of the USGS Partner Support
• Works with 8 to 10 states and territories.
• Advocate for the NHD.
• Technology expert that supports applications.
• Provides training on the NHD and editing tools.
• Coordinates overall activity for one of six regions.
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NHD Quality Control
• State steward runs quality control checks.
• USGS point of contact runs quality control checks.
• Database team in Denver runs the final quality control checks.
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NHD Stewardship Regions
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Memorandum of Understanding Status
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Resolutions of NHD Data
Medium
• 1:100,000 scale
• Lower 48 + HI
High
• 1:24K (1:63K AK)
• 50 States + PR/USVI
Local
• Higher than 24k
• Increasing number
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100K “Medium” Resolution – Providence Creek Headwaters in Delaware
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20K “Local” Resolution – Providence Creek Headwaters in Delaware
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100K “Medium” Resolution – Sarasota Bay Subbasin in Florida
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24K “High” Resolution – Sarasota Bay Subbasin in Florida
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Future of the NHD
• Watershed Boundary Dataset (WBD) Integration.
• GNIS Database Integration.
• Completely Revised NHDGeoEdit tool.
• Expansion of the NHD Model.
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Questions? – http://nhd.usgs.gov