Hi Dominic,
When you anyalyse the speed guesses in the graphhopper encoders you
should not look at any absolute values. These cannot be estimated
without knowing the physical strength and bike equipment of the
individual rider. It would be more interesting to look at the relation
of these values, e.g taking the 18 km/h value for highway=residential as
100%. It would be nice if you could provide some data and/or literature
in your thesis for this specific isolated issue, maybe also describing
what influence it has if cyclists and pedestrians need to share a way
and the width of the way ...
I think you need to forget the GPS tracks from osm for your purpose.
These are not even classified which kind of vehicle was used for
creating them. You might look at gpsies [1] using the "Extended search".
Under "More attributes" you need so select "GPS" recorded. Maybe you
find some useful data for your purpse there.
When you analyse the impacts of the infrastructure on cycle speed and
the features of routers, then one important missing graphhoper feature
is issue #75 (interpretation of traffic lights). Here it would be nice
to find information about average wait times for cyclists. Maybe you can
reference to literature for the wait times for cyclists and cars, the
average speeds and the influnce of the distances between the lights.
regards,
ratrun
[1] www.gpsies.com/trackList.do
Am 30.04.2015 um 11:23 schrieb Dominic Keller:
Thank you for your information, Peter.
If I get some nice results, I will inform you!
I dont know anything about useful gps-tracks available online, so I am
collecting data myself. The gps-tracks on planet GPX do not have
timestamps and no information about travelling mode, do they?
Kind regards,
Dominic
2015-04-30 11:14 GMT+02:00 Peter <[email protected]
<mailto:[email protected]>>:
Hi Dominik,
yes, just guesses from developers on the road and no literature
used. Would love to see some more solid ground for this e.g. using
OSM planet GPX
Keep in mind that these speeds are not max speeds but average
speeds. The maxspeed tag is handled differently in applyMaxSpeed.
Kind Regards,
Peter
On 30.04.2015 11:06, Dominic Keller wrote:
Hi all,
I am writing my master thesis about the influence of the
infrastructure on bicycle speed. Beside doing on-road experiments
I would like to give an overview, how routing algorithm calculate
the speed of bicyclist.
I have seen, that graphhopper uses a list of maxspeed parameter
in BikeCommonFlagEncoder.java
<https://github.com/graphhopper/graphhopper/blob/master/core/src/main/java/com/graphhopper/routing/util/BikeCommonFlagEncoder.java>,
like
setSurfaceSpeed("gravel", 12);
setHighwaySpeed("service", 14);
How did you defined these values? Are they just guesses? How did
you guessed them? Or could you find them somewhere in literature?
Thank you for your information!
Regards, Dominic
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