Map of top 50 mappers by number of changesets (= edits) committed to OpenStreetMap between January 1st 2012 and March 29th 2013. Each yellow dot on the map corresponds to the centerpoint of a single changeset.

This map does not include accounts that are exclusively used for programmatic edits (= bots).

Source for changeset data: OpenStreetMap Planet (changesets-latest.osm.bz2)

Source for aerial imagery: MapBox

Find the source code for the web application, maps and data processing on GitHub.

OpenStreetMap US – April 17, 2013