State of the Map Asia (SotM-Asia) is the annual regional conference of OpenStreetMap (OSM) organized by OSM communities in Asia. First SotM-Asia was organized in Jakarta, Indonesia in 2015, and the second was organized in Manila, Philippines in 2016. This year’s conference, third in the series, was organized in Kathmandu, Nepal on September 23 – 24, 2017 at Park Village Resort, Budhanilkantha, Kathmandu, Nepal. We brought nearly 200 Open Mapping enthusiasts from Asia and beyond to this year’s SotM-Asia. The event provided an opportunity to share knowledge and experience among mappers; expand their network; and generate ideas to expand map coverage and effective use of OSM data in Asian continent. We chose ‘from creation to use of OSM data’ as the theme of this year’s conference, emphasizing on the effective use of OSM data. We also brought together a government panel from four different countries in this year’s SotM-Asia. We believe this event will deepen the bond and enhance collaboration among OSM communities across Asia. More information about the conference can be found on: http://stateofthemap.asia.

1. Past holds the mirror to the future
How previous mistakes are paving way for newer techniques to prevent them.
Poornima Badrinath
Mapbox

2. OPEN SOURCE

4. Amazing details
Live updates
Advantages

6. Map breakages
Wrong data
Disadvantages

8. 21%
of incoming changesets are not good
An average of

9. From June 1st to August 31st
- All Reviewed changesets: 24,089
- Bad changesets: 5,074
- Critical: 148
- High: 740

10. How bad are bad
changesets?

11. -Critical
-Not critical

12. Critical changesets
Seriously breaking the map

13. Renders breaking

14. Fake cities added on the oceans

15. Country name or City name being shown incorrectly

16. Popular tourism destinations being vandalised

17. Harmful
Not critical but not needed on the map

18. Tons of unwanted viewpoints, amenities, shops, pois

19. Random parks and water bodies added

20. Random roads added: footways, paths etc

21. How or why does it happen?
Unintentional - Inexperience, by mistake
Intentional - fully aware of the bad changes

22. Unintentional
New users
New to the mapping concept
Not aware of the community
Not aware of the tagging/editing rules of OpenStreetMap
When editing - deleting/editing another feature by mistake

25. Intentional
Adding wrong data on purpose
Fully aware of the changes being made

26. Merry Christmas and a Happy New Year!

27. Virus mapping in Vietnam

28. Beautifully added unwanted highways

29. How can they be corrected?
To correct/prevent, first the error needs to be found and
analysed why it happened.

30. Three questions to ask!
What/why/how did it happen?
How was it corrected
How to make sure that it doesn’t happen again

31. Tools available

32. Validate your own edits: JOSM Validator

33. OSM Changeset Analyser

34. Detectors and Compare functions
How they help in catching the unwanted edits

35. What is a compare function or a filter

36. Comparisons between 2 versions

38. What can it do?
- Able to filter out changesets based on a few characteristics
- Flags the potentially harmful changesets based on the compare function
- Easy to keep an eye on a particular area based on the bbox.

40. How a compare function or filter is developed
FLOWCHART:
A bad
changeset
Analysing why
it happened
Checking the
features it
affected
Writing a
compare
function to flag
those edits
Using the
compare
function to flag
similar edits!

41. How the OSM community has
responded!

42. Changeset reverts

43. Feature editing

44. How you can do it
● Keep an eye on the area you are
familiar with
● Use tools like OSMCha to find
changesets in the area you are
interested in.
● Various other tools that flags
harmful changesets

45. How you can contribute?

46. Help in writing compare functions or new filters to catch
harmful edits
Check out the osm compare repository:
https://github.com/mapbox/osm-compare

47. Use OSMCha to filter out the incoming changesets
https://osmcha.mapbox.com/

48. Keep an eye on the changes happening around your area

49. Connect with the community members by changeset
comments, osm diaries, osm irc chat
https://www.openstreetmap.org/user/nammala/diary/41413

50. Help out new mappers in correcting their edits and sharing
guides and tutorials that would help them understand
https://www.mapbox.com/mapping/validating-osm/

51. Happy Validating! :)