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TNMCorps Project Webpage

The National Map Corps (TNMCorps) is an online crowdsourcing mapping project with volunteers successfully editing structures data in all 50 States, Puerto Rico, and the U.S. Virgin Islands. Structures include schools, hospitals, post offices, police stations, cemeteries, and other important public buildings. By updating and verifying structures data, volunteers are making significant contributions to the USGS National Structures Dataset, The National Map, and ultimately U.S. Topo Maps!


Anyone with an interest in contributing can volunteer. It is easy to sign up and get started! All you need is access to the internet, an email address, and a willingness to learn. “How to” documentation including a comprehensive User Guide and a Quick Start Guide will have you up and editing quickly. 

TNMCorps Web Editor


Volunteers earn virtual badges for participating and are recognized for their contributions (with permission) via USGS and National Map social media.


Not Sure where to start editing?
Begin editing in your own hometown or anywhere in the U.S., Puerto Rico, and the U.S. Virgin Islands.

Our Mapping Challenges focus on a structure type within specific region and are a fun way for volunteers to have their contributions recognized.

Still not sure where to edit?  Our Structure Finder is an interactive web map that randomly selects a point for you to edit or review.

TNMCorps Structure Finder



Project Updates

12/12/19 ------------------------

EXCITING NEWS!!  Mapping Challenges are Moving!

Please note that, after today's updates (see below), Mapping Challenge updates will no longer be posted on this website.  For the most recent information, visit our new website at https://www.usgs.gov/core-science-systems/ngp/tnm-corps.

Mapping Challenge updates will appear either in the News section or on a designed Mapping Challenges page:

New Mapping Challenges location

12/12/19 ------------------------

Challenge for OH/WV Closes!  Another Challenge Opens!

Topo maps in the West will be updated soon, so we've closed OH/WV and opened another!  

Check out our new Mapping Challenges page for more information.

12/12/19 ------------------------

Mapping Challenge Update: City/Town Halls in Michigan

Here is the weekly update for this challenge! 

Check out our new Mapping Challenges page for more information.

Click Here to check out more Project Updates


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