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: January 21, 2020

TNMCorps Mapping Challenge Summary Results for City / Town Hall Structures in MI

This challenge is now complete!!  Thank you to everyone who contributed!  Here is a time lapse of our volunteer contributions for this challenge:

Date published: January 16, 2020

Mapping Challenge Update (01/16/2020): City / Town Hall Structures in WA & OR

This mapping challenge is moving along nicely with another 30 points added!

Date published: January 16, 2020

Mapping Challenge Update (01/16/2020): City / Town Hall Structures in UT, NM, & AZ

Calling all Peer Reviewers and Advanced Editors! This challenge is SO CLOSE to being finished!!