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: February 12, 2020

Mapping Challenge Update (02/12/2020): City / Town Hall Structures in MT, ND, & SD

This challenge is coming along nicely with another 30 points added and 50 edits submitted since last week!

Date published: February 12, 2020

New Mapping Challenge! Schools in Arkansas

As we continue to prepare states for Topo production, here is another challenge for Arkansas schools!  Features participating in this challenge include General Schools, Elementary Schools, Middle Schools, and High Schools.

Date published: February 12, 2020

New Mapping Challenge! City/Town Halls in Arkansas

TNMCorps mapping challenges are now transitioning to the southeast with a new challenge for city/town halls in Arkansas!