OSMCha

OSMCha is short for OpenStreetMap Changeset Analyser. It is a web tool to help visualise and analyse edits made by mappers on OpenStreetMap (OSM). OSMCha was originally written by Wille Marcel in 2015 to validate changesets. After almost 10 years being supported by Mapbox, OSMCha became an OpenStreetMap US charter project in 2023.

Why use OSMCha?

• OpenStreetMap is a crowdsourced project, and it is necessary to have user friendly tools for the community, to guide new contributors to make a great map.
• Any given day, around 30,000 changesets containing additions, modifications, and deletions to the data make their way into OSM, which is driven by a strong community.
• With new users signing up on OSM every day, it is likely that the mapping guides/wikis on tagging scheme, general practices are not uniformly followed by every contributor, resulting in accidental edits, and in rare cases intentional vandalism that breaks the map.
• OSMCha is designed to be an integrated tool that can address various validation requirements of the community. OSMCha is also supported by an open source edit recognition project called OSM-Compare which can be used for suggesting manual verification.
• This tool offers advanced filtering options that can help you filter changesets based on various OSM metatags and attributes. (Ex: All changesets with hashtags, user specific changesets, etc.).