This page is focused on outlining the issues considered when developing time-enabled editors for Historical OSM.
Time-enabled editing has difficulties not encountered or considered when editing and maintaining maps of the current-day world. Frankie Roberto's 2009 Mapping History on Open Street Map presentation is an excellent summary of the issues related to editing and tagging historical information.
The actual format to use for time is worthy of its own discussion: Historical Time Format.
Time-enabled Editing Workflow
This is just one concept (of many) for adding historical information to OSM:
- Bring up the historical editor
- Set some desired time period (time pixel?) for editing
- See... what? in the editor - existing Historical OSM info for time selected (t)? or earliest info after t? or latest info before t? or both? this needs to be clarified
- Ideally, have an ability to query historic maps from the selected bounding box and time box from something like http://www.mapwarper.net - see an example map from 1856 Seattle: http://mapwarper.net/maps/512
- All edits during this time might be auto-tagged for time t... or date of active map being traced?
- All edits during this time might be auto-tagged ++ for source=warped map?
Which Editor to Use
It is unclear which editor is best suited for adapting for use with historical OSM related information.
- Potlatch2 - easy to use, but legacy; Flash
- JOSM - less easy to use, but extensible; Java