OpenStreetMap US

The ultimate OpenStreetMap validator

What are people mapping? OSMCha is an advanced (yet easy-to-use) tool to analyze bundles of OpenStreetMap edits, called changesets. Advanced filters, vandalism detection, and on-map visualization help you find and verify the changesets you care about.

Meet the team

News and talks

The state of OSMCha

Jun 10, 2023 · Wille Marcel

OSMCha is one of the main validation tools for OSM. It was created as an open-source software project in the spare time of a single developer. Then Mapbox supported its development and...

OSMCha Overview

Mar 29, 2023 · Wille Marcel

Mappy Hour is back! Join us this month to hear from Wille Marcel about OSMCha: a validation tool for OpenStreetMap.

Welcoming OSMCha as an OSM US Charter Project

Feb 17, 2023 · OpenStreetMap US Staff

OpenStreetMap US is excited to announce our latest Charter Project - OSMCha! OSMCha is an open-source software project started in 2015 focusing on reporting, inspecting, and validating changes to OpenStreetMap. Its mission...

A highway to OSMCha

Apr 2, 2022 · Wille Marcel

OSMCha is the main OpenStreetMap validation tool. It’s used both by corporate and community mappers. After many years being maintained exclusively by Mapbox, OSMCha is now entering a new phase. As Development...

What's new on OSMCha?

May 21, 2021 · Wille Marcel

The last months have been very active on the OSMCha development. This talk will show some main new features and what we have in mind for the future of OSMCha.