On 05/05/2014 17:26, Martin Koppenhoefer wrote:
no, this was not about overlaying 2 graphical layers but about joining the data into one layer (necessary I guess, in order to perform routing). [..]
Usage may be different, but the data is the same: ways with an hypothetical 'speed' attribute added to them in the persistent database of your choice. Whether you use that joined data to perform Dijkstra stunts or just render it graphically does not change its nature. In either case, no Openstreetmap data is altered in any way - only extended thus meeting the definition of a Collective Database.
To give a counter-example, if the speed data was used to guess maxspeed=* or change some of the highway=* classification according to detected speeds, then Openstreetmap data would be altered and there would be a Derivative Database.
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