http://gallery.usgs.gov/images/logos/usgs_only.jpg http://gallery.usgs.gov/ en-us OC_Web@usgs.gov (Office of Communications Web Group) http://gallery.usgs.gov/images/USGS.gif http://gallery.usgs.gov/ http://gallery.usgs.gov/videos/554 Presents the findings of a study on the positional accuracy of the NHD.

]]> http://gallery.usgs.gov/videos/555 Presents the findings of a study on the positional accuracy of the NHD.

]]> http://gallery.usgs.gov/videos/514 Explanation of Hydrologic Unit Codes (HUCs) within the Watershed Boundary Dataset (WBD). The National Hydrography Dataset (NHD) is organized based on these units and subsequently viewing and downloading NHD data from The National Map Viewer is organized by these Hydrologic Units.

]]> http://gallery.usgs.gov/videos/515 Learn how to download a dynamic extract of National Hydrography Dataset GIS Data (NHD) from The National Map.

]]> http://gallery.usgs.gov/videos/516 Learn how to download a prestaged subregion of National Hydrography Dataset GIS Data (NHD) from The National Map.

]]> http://gallery.usgs.gov/videos/448 Understanding drainage systems also known as Hydrologic Units or HUCs in the National Hydrography Dataset.

]]> http://gallery.usgs.gov/videos/450 Describes how linear referencing is used within the National Hydrography Dataset (NHD) to associate information with the dataset by attaching it to the network.

]]> http://gallery.usgs.gov/videos/451 Describes the NHD Network; how it is built, attributed, and used for analysis and modeling.

]]> http://gallery.usgs.gov/videos/452 Describes the way the National Hydrography Dataset (NHD) maintains the millions of features within the dataset. Talks about the roles of Points of Contacts (POCs) and of NHD Stewards, be them state, federal or local agencies.

]]> http://gallery.usgs.gov/videos/453 Describes the Hydrography Event Management Tools (HEM); what types of data the tool creates and how one can use them to attach information to the National Hydrography Dataset (NHD).

]]> http://gallery.usgs.gov/videos/454 Description of how to find events on the National Hydrography Dataset (NHD) network for analysis and modeling purposes.

]]> http://gallery.usgs.gov/videos/455 Provides an overview of the National Hydrography Dataset and of the National Map. Addresses topics such as the various applications of the NHD, watershed delineation, hydrologic units, ReachCodes, and the different features that make up the NHD.

]]> http://gallery.usgs.gov/videos/456 Provides an overview of the National Hydrography Dataset and of the National Map. Addresses topics such as the various applications of the NHD, watershed delineation, hydrologic units, ReachCodes, and the different features that make up the NHD.

]]> http://gallery.usgs.gov/videos/457 Explains how to download National Hydrography Data from The National Map Viewer and how to understand the data once downloaded. Also explains the Hydrologic Unit system (HUCs) and how they are composed.

]]> http://gallery.usgs.gov/videos/458 Displays and describes in detail the various features that make up the National Hydrography Dataset.

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