Introduction to The National Map Corps (TNMCorps)

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Welcome to The National Map Corps!


As part of the National Geospatial Technical Operations Center (NGTOC), The National Map Corps (TNMCorps) is a crowd-sourced mapping project that relies on volunteers to assist the U.S. Geological Survey's (USGS) National Geospatial Program by collecting and editing man-made structures data.


The structure feature types that volunteers are currently collecting include schools, colleges and universities, fire and EMS stations, law enforcement, prisons and correctional facilities, hospitals, ambulance services, cemeteries, and post offices. Volunteers can collect and update the 10 different structure feature types in all 50 states, as well as in Puerto Rico and the U.S. Virgin Islands.


Similar to how OpenStreetMap® allows anyone to collect, edit, and use geographic data through an online map editor, the USGS has developed a customized online editor to allow volunteers to participate in the collection and verification of structures data. After going through a tiered quality assurance process the structures data gets incorporated into the USGS' The National Map.


For more information on The National Map Corps and volunteered geographic information, visit our project website.




For additional information, see the following topic:


What would I be doing if I participate?