US Geological Survey
The mapping crowd-sourcing program, known as The National Map Corps (TNMCorps), encourages citizens to collect structures data by adding new features and/or correcting existing data within The National Map database. Structures being mapped in the project include schools, hospitals, post offices, police stations and other important public buildings.
The 16 recently added states needing help with structures are: Alabama, Arizona, California, Connecticut, Florida, Illinois, Louisiana, Massachusetts, Mississippi, Nebraska, Nevada, New Hampshire, Rhode Island, South Dakota, Vermont, and Wyoming, bringing the total number of states available for updating to 35. The final release of states by the end of the year will open up the entire country for volunteer structures enhancement.
Preliminary results of the effort have been very promising. As part of the project pilot, The National Map Corps had 143 volunteers who improved data for more than 6,400 structures in Colorado. The quality of the volunteer data collected met the USGS standards for position, attribution, and completeness.
The release of 19 states last April resulted in an increase of 154 new citizen geographers who have contributed their skills and local knowledge to The National Map.
Continue reading at USGS.gov