[talk-ph] gps traces from a delivery service company

[Eugene Alvin Villar]

Caveats: most GPX traces uploaded to OSM *are not* suitable for determining
traffic data. In most cases, the fact that one is surveying affects how one
drives and so the GPX data records how one surveys, not how one actually
drives.

Also, unless there's a fixed folksonomy, you cannot determine whether a GPX
track is from a motorcycle, a car, a van, or a bicycle. Most OSMers simply
tag their GPXs by the location.

In addition, some people anonymize their GPX data by randomizing the
timestamps or even by shifting the time data by an offset amount.

In conclusion, determining traffic data from GPX will only be successful if
there is a concerted effort to collect pristine uncorrupted data.
Unfortunately, OSM does not (yet) encourage this method of collection. I
think this has been discussed at the main OSM mailing list a few times
already.


On Wed, Jun 10, 2009 at 11:59 PM, maning sambale <emmanuel.sambale at gmail.com
> wrote:

> On Wed, Jun 10, 2009 at 2:27 PM, maning
> sambale<emmanuel.sambale at gmail.com> wrote:
> > analyze timestamps and point intervals, to interpolate traffic and
> > average speed at certain times of the day.
>
> Just want to share this, my average cycle speed (km/h) when mapping:
> http://farm4.static.flickr.com/3610/3613512951_c2bd08838b_o.png
>
> Imagine if we scale this metro manila gps traces collected by cars, we
> have an empirical data on the average traffic speed in the metro.
>
>
> --
> cheers,
> maning
> ------------------------------------------------------
> "Freedom is still the most radical idea of all" -N.Branden
> wiki: http://esambale.wikispaces.com/
> blog: http://epsg4253.wordpress.com/
> ------------------------------------------------------
>
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