The National Map Corps


TNMCorps is an online crowdsourcing mapping project with volunteers successfully editing structures in all 50 States, Puerto Rico, and the U.S. Virgin Islands

Click here to go to the The National Map Corps Editor

As part of The National Map, 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 USGS National Structures Database, 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. Begin editing in your own hometown or anywhere in the U.S., Puerto Rico, and the U.S. Virgin Islands.

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

Follow us on Twitter @USGSTNM or #TNMCorps or LIKE us on Facebook!


Click here for TNMCorps Newsletters




Date published: March 26, 2020

TNMCorps Newsletter – March 2020

The National Map Corps March 2020 Newsletter (Vol. 6, Issue 2) is now available.

Date published: March 23, 2020

Mapping Challenge Update (03/23/2020): Schools in GA & SC

Our volunteers are truly amazing with 550 edits coming in for this challenge since it was launched!

Date published: March 23, 2020

Mapping Challenge Update (03/23/2020): City / Town Hall Structures in GA & SC

This challenge is coming along nicely with almost 60 points added since it was launched!