I have recently discovered OHM and, whereas I understand the importance of displaying historical data and I acknowledge the importance of a crowdsorced approach like OSM, it is not clear to me how does OHM work and how it differs from regular OSM. As far as I know, the username, tagging system and even software (at least JOSM), work with OHM, but apparently, the database and infrastructure are completely different.
To make things more confusing, since I haven't seen any timeline or slider, I am wondering if the displayed data has to be focused on a specific period of time or not. That would explain the fact that I zoomed in some areas like Rome or Egypt which potentially may have historical data due to their long history, but could not see any data on the map. Regards, Carlos Cámara http://carloscamara.es
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