August 29th, 2009
A while ago, I made a visualisation showing which were the most widely-used editors for OpenStreetMap. This was based on the created_by tag, which isn’t an ideal way to do things because different editors treated that tag in different ways. Since the API 0.6 upgrade, there has been a better method: changesets.
Each pixel is coloured by what proportion of changesets intersecting that pixel were uploaded by that editor; red for JOSM, blue for Potlatch and green for Merkaartor. Don’t read too much into it, though, as the editors have different behaviour when opening and closing changesets.