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

See all posts

Not just a pipe dream: scaling up OpenStreetMap validation

Jun 8, 2024 · Marc Farra and Wille Marcel

This talk introduces the new OpenStreetMap data pipeline that has been built for OSMCha and has now been migrated to the OSM US organization. We will talk about real-changesets, one of the...

OSMCha has a new home at OpenStreetMap US

Mar 12, 2024 · Wille Marcel

At the beginning of 2023 we announced OSMCha as a charter project of OpenStreetMap US. After almost 10 years of being generously hosted by Mapbox, OSMCha moved to a new home at...

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...