Paul, The GPS data is from Scout (US as well as Skobbler / Global) users. It is collected during navigation sessions as well as in Scout Global ‘free drive’ mode.
The fact that you see incomplete sets is to do with pretty high thresholds we set for the validity of a tile as a whole. We want to prevent that we present too many false positives that would make the experience frustrating. It turns out that Scout is in fact used a fair bit by commercial drivers, so you’ll see a bunch of tiles depicting access=private service roads on factory lots and so on. There’s not really a great way for us to filter those out up front, other than convincing drivers to shut down their nav session before they enter a private road ;) If you look closely you’ll also see traces from trains, airplanes etc. People use Scout in some places we had not really imagined! We try to filter these out based on speed and we’re improving the algorithm to filter out traces that match to railways in the future as well. Thanks for sharing your observations! Martijn > On Sep 30, 2015, at 12:40 PM, Paul Johnson <ba...@ursamundi.org> wrote: > > On Wed, Sep 30, 2015 at 10:11 AM, Martijn van Exel <m...@rtijn.org > <mailto:m...@rtijn.org>> wrote: > Our OSM team cooked up something new. A missing roads plugin for JOSM. I > think it's pretty nice but I would really like to hear what you think. > > Neat, has potential. > > You can read some more about it on my diary (http://bit.ly/missingroads > <http://bit.ly/missingroads>) but it's basically what it says on the tin. The > plugin will show where we think roads are missing from OSM based on GPS data > so you can add them :) > > Based on whose GPS data from where? I trust the source in this question is > completely halal, kosher, gluten-free, vegan, organic, free-range, > all-natural data, but some of the output I'm getting from it is rather odd. > Take, for example, this screenshot in JOSM near node 148319848 > <http://www.openstreetmap.org/node/148319848#map=14/36.1758/-95.8591> in my > neighborhood. > > <Screenshot - 09302015 - 01:28:10 PM.png> > > Other than highlighting my own inadvertently selective blindness (what with > having not mapped the large and aging chain link fence factory on the > northeast corner of the intersection; Brinks behind my favorite QuikTrip > <http://www.openstreetmap.org/way/360912244#map=16/36.1769/-95.8668> only > recently appeared on Bing), I do find two things remarkable about this > plugin's output: > It seems to have picked out an incomplete set based on the paths relative to > imagery. > I have no way of being able to survey the exact location of the GPS output > from the plugin from the ground (it's inside a fence factory, of course it's > fenced off!), so I can only assume the GPS was located on one of those big > diesel-powered forklifts. > > _______________________________________________ > Talk-us mailing list > Talk-us@openstreetmap.org > https://lists.openstreetmap.org/listinfo/talk-us
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