The National Map Corps (TNMCorps ) is a crowdsourcing mapping program with volunteers successfully editing structures in all 50 States, Puerto Rico, and the US Virgin Islands. Structures are one of the layers in The National Map and include schools, hospitals, post offices, police stations, cemeteries, and other important public buildings.
Using a web-based mapping editor TNMCorps volunteers collect and/or improve structures data by adding new features, removing obsolete points, and correcting existing data. ......continued ...