Hi Martin, Thank you for your comments. Although 30 seconds are large interval, but when I aggregate all data in a period from 20,000 vehicles, the trajectory is very dense, and cover almost all the roads. For legal issue, I will investigate that. But definitely I am not going to upload the original GPS data.
J On Thu, May 23, 2013 at 3:28 PM, Martin Koppenhoefer <[email protected] > wrote: > > 2013/5/23 Jingmin Chen <[email protected]> > >> Dear all, >> >> I currently have access to 2 years, 20,000 taxi vehicles GPS trace (30sec >> interval) of a large city in China. The OSM data quality of that city is >> really bad. But uploading the raw GPS trace might have legal issues. Is it >> possible to process the data to roads before I upload to OSM? Thank you >> very much for any suggestion. >> > > > > Did you have a look at some examples whether this is useful data > (precision wise and because of the relatively low frequency)? I am not > aware of the average traffic speed in this town, but in 30 seconds in many > cities you could move quite "far". Another potential issue, which mappers > would have to keep in mind when deriving data from these traces, is that > taxis often have special traffic rules, so it is not given that any car > could take the same route than a taxi could. And lastly, there might be > legal issues (AFAIK mapping or registering GPS-traces is forbidden in > China, at least if you intend to publish them in a foreign country, not > sure whether you are operating from inside China or from abroad). > > cheers, > Martin > -- --------- Dr. Jingmin Chen Scientist Transport and Mobility Laboratory School of Architecture, Civil and Environmental Engineering EPFL - Ecole Polytechnique Fédérale de Lausanne http://transp-or.epfl.ch/personnal.php?Person=CHEN Phone: +41-21-693.2532 Fax: +41-21-693.8060
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