This document introduces OpenHistoricalMap.org (OHM), a project to map historical objects and places in OpenStreetMap. OHM maintains a separate database from OSM to store historical data with start and end dates. Examples are given of areas mapped in both historical and current times. Contributors can add historical data by importing archive data from OSM, tracing from historical maps, or directly editing in OHM with normal OSM tags plus start/end dates. Future goals include more map layers, timesliders, and better tracing tools to make OHM data more accessible and usable.

1. Tim Waters
SOTMS15 Oct 2015
“Chippy” @tim_waters tim@geothings.net

2. What it isn't (quite)
Historical Objects in OSM

3. What is it? (The logo is a hint)

4. OpenHistoricalMap.org
Most modest mapping project EVER!
Everything that has ever existed
World's most out of date map.

5. OSM Stack
Separate Server
Separate Database
Planet
Overpass API
http://overpass.openhistoricalmap.org

6. Examples

7. Hunterston Scotland 19C

8. Hunterston Scotland Now

9. Saeby – Denmark 18C

10. Saeby – Denmark Now

11. Roman Roads

12. Roman Mainz

13. WWI Trenches, Artillery positions etc

14. Paris 19C

15. Snows Infected Pump

16. Snows Infected Pump

17. in OHM

18. Burning Man 2008/9

19. OHM OSM
20C Treasure Island - SF Bay

20. Manhattan
1854

21. How to add stuff to OHM

22. A very old garmin

23. Imports
Archive from OSM
Tracing from Historical Maps

24. WikiMedia Commons - Wikimaps

25. Wikimaps

30. Editing
● Tags – normal OSM ones
● start_date end_date
– YYYY / YYYY-MM-DD
● Note of source map would be nice

31. Simple?
● Rabbit hole
● Cart before horse?
● Gregorian dates.
● Vagueness / fuzzy

32. imho
● OSM way -
– good enough is better than perfect.
● Contributors not historical GIS “experts”
● Do whatever and let the renderers sort it out!

33. Future
● More Map layers
● Timesliders.
● Vector tiles
● Better tracing tools
OpenHistoricalMap.org
#ohm on irc.oftc.net
https://lists.openstreetmap.org/listinfo/historic
https://github.com/openhistoricalmap/
“Chippy” @tim_waters tim@geothings.net