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Hydrography Dataset Events
InterMountain GIS 2014NHD Workshop
April 7, 2014
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Examples of events• Essentially any water-related data
that can be given a location:• Aquatic species habitat• Stream gage• Water quality station• Temperature measurement• Water rights• Recreation designations• Fish distribution• Wildlife sightings• Pollution control classifications• A study or news article• … many more
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Reachcodes and measures provide an “address” for events
Figure source: “USGS National Hydrography Dataset- Linear Referencing”, online PDF
EVENT
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Like a house address
Figure source: “USGS National Hydrography Dataset- Linear Referencing”, online PDF
ZIPCODE STREET
House Number
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Events add intelligence to the Hydrography Dataset
Figure source: “USGS National Hydrography Dataset- Linear Referencing”, online PDF
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Take Home Messages
• The NHD provides a universal system for linking, or addressing, data (linear referencing)
• Addressing water data (events) to the NHD integrates your data with other data, facilitates data discovery, and increases sharing opportunities
• Linear referencing adds intelligence to your data (and, vice versa, your data add intelligence to the NHD)
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USGS Video
• Linear Referencing (4:21)– http://nhd.usgs.gov/
videos_demos.html#.U07AuFcVAwA• HEM tools (3:43)– http://gallery.usgs.gov/videos/453#.UzXJRVemX5M