[GraphHopper] Duration tag

[Peter]

Hi Jean,

as Andreas already noted there are two options:

/1. add support for durations in addition to speed or//
//2. use the length of the ferry and the time to calculate a speed/

What exactly are the problems you were having and what did you try?
Increasing the precision should be just a matter of changing 5 to 0.5
for the factor of the encoded value.

Kind Regards,
Peter

On 11.05.2015 20:12, jean hilda wrote:
> Hi Peter,
>
> We have tried during the past days to make some change on the encoded
> value but unfortunately we didn't succeed ...
> To avoid that, I was wondering if there was a way to ask graphhopper
> to calculate the shortest way only with duration tags ? That means
> asking graphhopper to take in account only duration (not distance with
> speed). Is there a basic way to do that ?
>
> Thanks again
>
> Jean
>
> 2015-05-07 0:34 GMT+02:00 Peter <graphhopper at gmx.de
> <mailto:graphhopper at gmx.de>>:
>
>     Hi Jean,
>
>     the precision of an encoded value is defined per value and can be
>     also 'float' values. See the EncodedValue class and its usage e.g.
>     in CarFlagEncoder for speed.
>
>     Regards,
>     Peter
>
>     On 06.05.2015 14:18, jean hilda wrote:
>     > Hi,
>     >
>     > Thank you Andreas and Peter for your help. We have already tried
>     to solve the problem by defining a speed on the ferry routes (with
>     speed in km/h = Duration / Ferry route lenght). But we are facing
>     another difficulties : most of our ferry routes are very short
>     distance (around 200 meters) and for the duration, it's generally
>     around 50 minutes (because of waiting time / frequency of rotation
>     and so on). So we get speed for our ferry routes < 1 km (could be
>     0.2 Km / h). I believe speeds on Graphhopper has to be  strictly >
>     1 km /h (it has to be an integer). Is there a way to change that
>     somewhere in the code and authorize speed between 0 and 1 km /h
>     (not integer) ?
>     >
>     > Thanks a lot
>     >
>     > Jean
>     >
>     > 2015-05-06 11:46 GMT+02:00 Andreas Wolf <dev at a-w.io
>     <mailto:dev at a-w.io> <mailto:dev at a-w.io> <mailto:dev at a-w.io>>:
>     >
>
>>     Hi,
>>
>>     Am 05.05.2015 um 12:10 schrieb jean hilda:
>>     > We are testing graphhopper with the CarFlagEncoder. To do so, we
>>     > have created ways with highway=primary and maxspeed value and ways
>>     > with route=ferry and duration tags with value = "hh:mm:ss" (no
>>     > maxspeed for ferry).
>>
>>     > primary ways and ferry routes are connected with nodes belonging to
>>     > each others. With duration tag and no maxspeed tag on ferry
>>     > routes, Graphhopper can't find a route. With no duration tag and
>>     > maxspeed tag on ferry routes, Graphhopper is able to find a route.
>>
>>     > Are we missing something or maybe graphhopper don't work with
>>     > duration tags on ferry route ?
>>
>>     AFAIK, there is no support for durations currently. At least I have
>>     not seen it in the flag encoding, which is where it should
>>     normally be.
>>
>>     There are—in my eyes—two ways to add this:
>>
>>     1. add support for durations in addition to speed or
>>     2. use the length of the ferry and the time to calculate a speed
>>
>>     Approach 1 is definitely more work, especially in the routing part (I
>>     have not really dug into that, so I cannot tell you exact steps).
>>     Approach 2 OTOH might be rather inaccurate, as the speed is rounded
>>     with a given precision (I think 5 km/h by default) to save space.
>>     With
>>     an additional flag, you could probably turn off this rounding for
>>     some
>>     ways (at the expense of lower possible maximum speed, but ferries are
>>     rather slow anyways).
>>
>>     Regards
>>     Andreas
>>
>     >
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