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 • 11:00am - 11:30am
Geoconflating the Rhode Island 1:5K Hydrography: Blackstone River Watershed Case Study

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Alisa Morrison, URI Coastal Institute

The GeoConflation process is used to migrate attribute information from a source database to a target database in order to maintain reachcodes contained in source data. The source data, obtained from 1:24k NHD, is compared to the target data (1:5k). Where geometries match, attribution is automatically transferred. Close matches are flagged. If the feature exists in the original, but not in the target, the source feature is removed. Where the feature exists in the target but not the source, a new ReachCode is applied to the feature.The majority of the work in geoconflation done during the preprocessing stage. The end result of the process is a dataset consisting of the new geometry with reach codes and unique identifiers. All changes to the original data are tracked and the target data must pass required QA/QC checks. The objective of our project was to utilize the geoconflation process on a pilot area in Rhode Island, the Blackstone River Watershed. The 24k NHD was conflated to the local 1:5,000 hydrography database, compiled from 1997 1:5,000 orthophotography. We used LIDAR and orthoimagery to improve spatial accuracy to the maximum extent possible.


Alisa Morrison

URI Coastal Institute

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

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