OpenStreetMap

OSM Contributor Analysis - Entry 2: Annual Summaries of User Edits

Posted by Jennings Anderson on 6 July 2016 in English (English)

Over the past two weeks I have been trying out some new methods to uncover user focus on the map. Investigating this idea of user focus includes questions like:

  • Are there areas where a specific user edits more frequently or regularly?
  • Are there multiple contributors who focus on the same areas?
  • Do these activities correlate to “map gardening”?

To answer these questions, I’ve put together an interactive map, similar to How Did You Contribute to OSM by Pascal Neis , but with the addition of being able to compare multiple users through the years.

Check it out Here: OSM Annual User Summary Map

Please Note: Requires recent versions of Google Chrome (recommended) or Firefox (>=35).

How does it work?

Using the annual snapshots osm-qa tiles, I have calculated the following statistics for each user’s visible edits at the end of each year on a per-tile basis:

  • of total edits

  • of buildings

  • of amenities

  • kilometers of roads

With this information, we can look at areas of specific focus for a given user by applying minimum thresholds. For example, here are most of the tiles edited by seven different users in 2011: 7 Users No Filter When we increase the threshold for minimum percent of edits, we see that though this particular user has thousands of edits all over the Country, 70% of his edits are on this one tile! 7 Users FIltered

Just by playing around with this map, it seems that even users with millions of edits always have a handful of tiles where they seem to be significantly more active. Of course this begs the question, “is this the user’s hometown?” or perhaps even more importantly, “is this user contributing local knowledge to these particular tiles?”

When you zoom in close, you can click on any given tile and get a list of the top 100 contributors on that tile for the year. Clicking on any user in that list will load their edits onto the map. List of Users

What’s Next?

This is just the first step of many to come in doing community detection in OSM through social network analysis!

More to come! Jennings

Location: The Hill, Boulder, Boulder County, Colorado, 80802, United States

Comment from Max Vasilev on 7 July 2016 at 09:11

Not work.

Comment from RobJN on 7 July 2016 at 23:02

It does for me. You need to click “Next” to change the “Edits in” year to something more recent for most mappers (those who weren’t editing in the early years of OSM).

Comment from bdiscoe on 9 July 2016 at 04:00

This is really useful, thanks! It allowed me to solve some mysteries, for example, there was an account named “lks1” which did a ton of edits in west-central Poland, but then they suddenly disappeared. Using this tool, I was able query that area of Poland, to find that the account is now known as “lks1[konto usunięte]”, i.e. lks1[account deleted].

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