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Hi Dominic,<br>
<br>
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 ... <br>
<br>
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.<br>
<br>
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.<br>
<br>
regards,<br>
<br>
ratrun<br>
<br>
[1] <a class="moz-txt-link-abbreviated" href="http://www.gpsies.com/trackList.do">www.gpsies.com/trackList.do</a> <br>
<br>
<div class="moz-cite-prefix">Am 30.04.2015 um 11:23 schrieb Dominic
Keller:<br>
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cite="mid:CACgJAnrPqhq3kJhn2dY6xqmTihoRUcLVmzyYUNjkhn+ME5J7mw@mail.gmail.com"
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<div>Thank you for your information, Peter.<br>
<br>
</div>
If I get some nice results, I will inform you!<br>
<br>
</div>
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?<br>
<br>
</div>
Kind regards,<br>
</div>
Dominic<br>
</div>
<div class="gmail_extra"><br>
<div class="gmail_quote">2015-04-30 11:14 GMT+02:00 Peter <span
dir="ltr"><<a moz-do-not-send="true"
href="mailto:graphhopper@gmx.de" target="_blank">graphhopper@gmx.de</a>></span>:<br>
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<div>Hi Dominik,<br>
<br>
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<br>
<br>
Keep in mind that these speeds are not max speeds but
average speeds. The maxspeed tag is handled differently
in applyMaxSpeed.<br>
<br>
Kind Regards,<br>
Peter
<div>
<div class="h5"><br>
<br>
On 30.04.2015 11:06, Dominic Keller wrote:<br>
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<div class="h5">
<div dir="ltr">Hi all,<br>
<br>
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.<br>
<br>
I have seen, that graphhopper uses a list of
maxspeed parameter in <span
style="background-color:rgb(255,255,255)"><a
moz-do-not-send="true"
href="https://github.com/graphhopper/graphhopper/blob/master/core/src/main/java/com/graphhopper/routing/util/BikeCommonFlagEncoder.java"
target="_blank">B<span
style="background-image:none;background-repeat:repeat">ikeCommonFlagEncoder</span>.java</a>,
like</span><br>
<blockquote>setSurfaceSpeed("gravel", 12);<br>
setHighwaySpeed("service", 14); <br>
</blockquote>
How did you defined these values? Are they just
guesses? How did you guessed them? Or could you
find them somewhere in literature?<br>
<div><br>
</div>
<div>Thank you for your information!<br>
</div>
<div>Regards, Dominic<br>
</div>
</div>
<br>
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