[GraphHopper] Duration tag

[Peter]

Hi,

there is already duration support via the second approach Andreas
mentioned in AbstractFlagEncoder.handleFerryTags

Not all strings are supported though, see the comments in the code.
Please submit a simple unit test showing that the duration handling or
parsing does not work, this way we can faster fix it.

Regards,
Peter

On 06.05.2015 11:46, Andreas Wolf wrote:
> 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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