Schwotzer, ThomasFretag,UlrikeFuchs-Kittowski, FrankHosenfeld, FriedhelmAbecker, AndreasWikarski, Dietmar2019-11-222019-11-222017https://dl.gi.de/handle/20.500.12116/30240OHDM is a platform that allows interested amateurs and professionals to store historical card data and location and time-related information. OHDM is open and free. It expands the idea of Open Street Map (OSM) by a temporal dimension and provides more ways of storing data. OHDM is part of the Open Data Movement.deText/Conference Paper