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mappy-hour-2020.pdf

  1. 1. Richard Welty Mappy Hour - 2020-07-08 Open Historical Map
  2. 2. The Goal … is to create the world's most universal, detailed, and out-of-date map
  3. 3. The Reality • There is much blank space in OHM • There is more than enough of history after all • There are some very detailed areas
  4. 4. Projects https://wiki.openstreetmap.org/wiki/Open_Historical_Map/Projects
  5. 5. Projects
  6. 6. What’s the same as OSM? • The database schema • Editing API • The editors • Fork of iD on the Open Historical Map website • Easy to con fi gure JOSM to access OHM instead of OSM • Our own instance of Overpass, unmodi fi ed • OSM tagging largely relevant
  7. 7. What’s Different? • Mapping things that no longer exist is encouraged • Mixed licensing model (license tag) • CC0 encouraged • CC-BY-SA is ok • mass copying from OSM is a bad idea because of the way ODbL works • start_date and end_date tagging is important • Care with sourcing - we are acting as Public Historians • Documentation of active projects in the Wiki is encouraged
  8. 8. What’s Different? • Vector tiles with the Time Slider • new with the recent reconstruction of the site • Time Slider uses start_date and end_date to determine what to display • start_date & end_date • currently ISO date formats supported (yyyy-mm-dd) • will be extensions in the future
  9. 9. Timeslider demo
  10. 10. Editing • When all of history is in front of you in a map editor, information density can become insane, or at least a bit unwieldy • JOSM fi lters o ff er some help • compare start & end dates to particular years • iD may have fi lter support coming to help • not ideal in current form, but usable
  11. 11. Tagging Experimentation • no equivalent to OSM tagging list and tag voting • we are on a learning curve with respect to historical tagging • currently working with relations as ways to show di ff erent con fi gurations over time • use of street relation proposal or associatedStreet relation as ways of grouping ways in to streets that may have changed name, paving condition, classi fi cation, or status over time • use multipolygon same way for areas that change over time
  12. 12. Sourcing • modern sources (Bing, Mapbox, ESRI, etc.) of limited value • permissions may not extend to OHM • Mapbox and ESRI have responded positively to our requests • most importantly, stu ff we want to map is often not in modern imagery • historic sources are everywhere • Libraries, Universities, Historical Societies, Museums • May or may not be geo referenced • mapwarper.net • for maps and aerial imagery that is not available in georeferenced form (TMS, WMS, WTMS URLs)
  13. 13. Sourcing Dates • Easy to say “start_date” and “end_date”, harder to do • maps and aerials o ff er point-in-time information • use external written documentation where found • build date ranges by referencing multiple sources • in Albany, I’m looking at a wealth of maps at various points in time • access your local historical community
  14. 14. OHM project mindset • long and medium term projects • can’t fi nish it quickly by looking at bing and maybe driving out for a ground survey • plan on gradual improvement as knowledge develops • wikipedia can be a research start point - but probably never an end point • follow and verify citations • when you fi nd problems in wikipedia, you do actually have the power to address them - if you’ve done the research
  15. 15. Examples - military history • Munin project • WWI fi eld forti fi cations • American Civil War • Gettysburg • Antietam • potential for driving animations
  16. 16. Examples • Diversity • Seneca Village (NYC) • Rapp Road Historic District (Albany NY) • Potential diversity projects • Tulsa OK - Black Wall Street as it was • other majority minority communities of note • deed restrictions
  17. 17. Examples • OHM-OSM synthesis • Monument/Statues • migrate monuments/statues to OHM as they are removed • document start & end dates, other properties • Ghost Tracks • race tracks of the past
  18. 18. Online presence • historic@openstreetmap.org mailing list • OSM US Slack • OSM Discord • @OpenHistMap twitter • OpenHistoryMap Facebook group • #ohm on irc.oftc.net • may be retiring irc channel

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