NEARC Fall 2015 has ended

Welcome to the technical sessions schedule for the 2015 Annual Fall NEARC Conference. 

 The technical schedule is capable of being sorted by date (i.e, Monday, Nov. 9) or track (i.e. USGS Hydro). You can also search for a presentation title (i.e. Harmonizing the NHD and WBD Datasets in Maine), key term (i.e. NHD), or presenter last name (i.e. O’Neil-Dunne). The sort and search functions can be found on the navigation panel on the right side of this page. If you hover over the "Schedule" button, you’ll also see different schedule view options (i.e. Grid or Simple). Try selecting each of them to see which view you prefer. 

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Monday, November 9 • 11:30am - 12:00pm
Harmonizing the NHD and WBD Datasets in Maine

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Martha G. Nielsen, USGS New England Water Science Center

In 2013, the USGS-New England Water Science Center began preparing datasets for the creation of a Maine StreamStats application. The data preparation involved using a snapshot of the National Hydrography Dataset (NHD) flow line feature dataset (“NHDFlowline”) and the Watershed Boundary Dataset (WBD) and conducting a detailed QC analysis of the two datasets. Hydrologically, the NHDFlowline features should intersect with the WBD lines at very few places – only where there are legitimate inflowing tributaries for a given hydrologic accounting unit (or HUC) boundary, and only one outflow point. Using relatively simple analysis tools, errors and inconsistencies between the two datasets were located and cataloged. Using an editing environment which allowed for viewing the data in their hydrographic context (USGS topographic map DRGs overlaid on a shaded relief image of the digital elevation model) was crucial to the evaluation of potential errors in both the NHDFlowline features and the watershed boundaries. The analysis showed that both datasets (WBD and NHDFlowlines) needed correcting, because of incorrect digitizing of flowlines, improper interpretation of hydrologic connections in the NHDFlowline features, incorrect watershed boundary locations, or a combination of these. By the end of 2015, all the identified errors will be addressed and the NHD and WBD will be harmonized in Maine.


Monday November 9, 2015 11:30am - 12:00pm EST
VT Conference Room
  USGS Hydro

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