On 14 Feb 2010, at 21:31, Graham Jones wrote: > Hi, > I am wondering about the possibility of using the collected GPX traces in the > database to calculate the average travel time down sections of road (I am > thinking that this would be a useful thing from a routing point of view?). > Two questions: > Has this already been done? I can't find any discussion of it. > If not, is there an API method of getting the GPX traces within a given > bounding box (I can only find a way of getting points, and unfortunately they > do not include the trace ID). [If it is not possible, what is the process I > would need to follow to get a change to the API agreed and implemented?] > My idea is that for a given segment of road you do a query to get the GPX > traces that are near to the road segment, filter them to decide which ones > are on the road, then work out the velocity for each trace along the road. > There will be some statistics involved to separate bicycle from car travel, > then use the average as a best estimate of the travel time for that section > of road (if we had enough traces you could even work it out by time of day). > This will be of no use in towns where many of the traces will have been > collected on foot or by bike, but on main roads I think it might give useful > results, as there are likely to be multiple traces for the various sections > of road. > > Any thoughts would be appreciated - I am thinking this may be a nice little > student project if I do not get around to doing it. >
You need more meta data such as which vehicle the person was traveling for this to be easy. Also many of the tracks that are available, will be biased towards a mapping pattern, which is slower and more stop/start than normal a to b journeys Where users have set the recently added permission to make their track identifiable, the track info will be included in the information returned by the points API call. Shaun > Regards > > Graham. > > -- > Dr. Graham Jones > Hartlepool, UK > email: [email protected] > _______________________________________________ > dev mailing list > [email protected] > http://lists.openstreetmap.org/listinfo/dev
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