Geographic Information Systems (GIS) Services Frequently Asked Questions:

_{How do I download data from the USGS Seamless Data Distribution Center?}

• National Elevation Dataset (NED): seamless, national digital elevation data with 30m spatial resolution
• 1/3 and 1/9 NED available for some areas (~10m and ~3.3m)
• Elevation data updated bi-monthly
• High-resolution Orthoimagery for many cities, including 2002 imagery for Chapel Hill, Raleigh, & Durham
• 1992 and 2001 National Land Cover Data
• DRGs (Digital Raster Graphics), Scanned USGS topo maps- listed under "Orthoimagery"

Watch the movie and see below for step-by-step instructions on using the USGS Seamless site.

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For more GIS assistance,
Please contact Amanda C. Henley, GIS Librarian
amanda.henley@unc.edu
(919) 962-1151