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Welcome to the interactive web schedule for the 2018 Fall NEARC Conference! To return to the NEARC website, go to: https://www.northeastarc.org/fall-nearc.html

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Hydrography [clear filter]
Tuesday, October 30


Hydrography Track. Introduction to the National Hydrography Dataset and Stewardship
AUTHORS: Tatyana Dimascio, USGS

ABSTRACT: The National Hydrography Dataset (NHD) is a comprehensive set of digital spatial data that represents the surface water of the United States. Ongoing maintenance of the NHD is essential. The collaborative data stewardship program with State and local governments, Federal agencies, and other users of the data helps improve the NHD. Updates to the NHD are made by stewards, transmitted to the USGS, processed, and made available in the national dataset for distribution. This presentation will provide a high-level overview of the NHD and stewardship process.

Tuesday October 30, 2018 8:30am - 9:00am
Broadway 1&2


Hydrography Track. Artificial Paths and Connector Features in the National Hydrography Dataset: The Pennsylvania Experience
AUTHORS: Scott Hoffman, USGS, Pennsylvania Water Science Center

ABSTRACT: The National Hydrography Dataset (NHD) is a digital geospatial dataset that maps the surface water of the United States. The NHD High Resolution (HR), at 1:24,000-scale or better, is the most up-to-date and detailed hydrography dataset for the nation, supported and maintained by the U.S. Geological Survey. The NHD medium resolution, at 1:100,000-scale, is a legacy dataset with the US EPA acting as the primary custodian supporting modeling applications. Both datasets are part the national framework for NHDPlus: NHDPlus_Version2 at the 1:100,000 scale, and NHDPlusHR at the 1:24,000 scale. Critical to the accuracy and function of each dataset is the correct geometry of the stream network. Errors in the network cause miscalculations for various parameters including drainage area and stream miles. The incorrect placement of Artificial Path or Connector features can be the main cause for stream network errors in NHDPlus datasets used in state-specific StreamStats applications. In Pennsylvania, the impact of geometry errors in NHDPlus_Version2 and NHDPlusHR will be discussed with selected examples from both datasets. Also shared will be some of the terminology used in the recently released NHDPlusHR Mark-up Tool to submit corrections into the NHD database.

Tuesday October 30, 2018 9:00am - 9:30am
Broadway 1&2


Hydrography Track. The National Hydrography Dataset (NHD) and National Hydrography Dataset Plus High Resolution (NHDPlus HR)
AUTHORS: Peter Steeves, USGS

ABSTRACT: The National Hydrography Dataset (NHD) is the U.S. Geological Survey’s geospatial dataset used to portray surface water in The National Map. The NHD represents the drainage network with features such as rivers, streams, canals, lakes, ponds, coastline, dams, and streamgages. The NHD also includes a linear referencing system based on reach codes that functions like a street address, and network connectivity information that enable analysis and discovery of information upstream or downstream of a point of interest.
The National Hydrography Dataset Plus (NHDPlus) enhances the NHD by incorporating two other USGS datasets; seamless elevation data from the 3D Elevation Program (3DEP), and delineations of drainage divides from the Watershed Boundary Dataset (WBD). The NHDPlus comprises an integrated suite of hydrologic geospatial data sets, including a hydrographic stream network, polygonal catchment areas representing incremental drainage areas for each stream network element, and Digital Elevation Model (DEM) derivatives including flow direction and flow accumulation grids. The USGS and U.S. Environmental Protection Agency (USEPA) collaborated to produce two versions of the NHDPlus (V1 and V2) using the Medium-Resolution NHD at 1:100,000 scale, 30-meter elevation data from 3DEP, and WBD. Now the USGS is working on NHDPlus HR, which uses techniques and software from NHDPlus V2 with the NHD High Resolution (1:24,000-scale or better), 10-meter elevation data from 3DEP, and WBD. Many applications have been built upon the previous versions of NHDPlus, which we anticipate will expand with the NHDPlus HR. This presentation will provide an introduction to both NHD and NHDPlus HR.

Tuesday October 30, 2018 9:30am - 10:00am
Broadway 1&2