Fact Sheet 2011–3103
Since 1994, citizen volunteers have helped the U.S. Geological Survey improve its topographic maps. Through the Earth Science Corps program, citizens were able to "adopt a quad" and collect new information and update existing map features. Until its conclusion in 2001, as many as 30 volunteers annotated paper maps which were incorporated in to the USGS topographic-map revision process.
First posted October 24, 2011
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Wolf, E.B , Poore, B.S., Caro, H.K., and Matthews, G.D., 2011, Volunteer map data collection at the USGS: U.S. Geological Survey Fact Sheet 2011–3103, 2 p.