[GraphHopper] Cannot flush graph

[Tuan Nguyen]

Hi Peter,

Thanks for the clarification on speed unit.

My validation logic was to check if getSpeed() in current graph EXACTLY
match the double value that I set before. This usually does not match as
you said, "due to the limited resolution".

Btw, can you elaborate a bit on the use of speedBits, speedFactor when
storing speed? I know how to update speed through your blog posts but I
cannot understand internally how it works. Or if you can point me to
another resource, that would be much appreciated.


Kind Regards,
Tuan.

On 3 July 2015 at 17:21, Peter <graphhopper at gmx.de> wrote:

>  Hi,
>
> good that you solved the problem but would you elaborate a bit on this:
> "They are always different as the way Graphhopper processes double value."
>
> Do you mean that getSpeed returns two different values before and after
> flush? Or just the speed you are expecting vs. what getSpeed returns -
> then, yes this is expected due to limited resolution which you can tune in
> the flagencoder.
>
> And the speed is km/h ... We even do not support mile in the UI (yet)
> https://github.com/graphhopper/graphhopper/issues/396
>
> Peter
>
>
> On 03.07.2015 07:53, Emux wrote:
>
> On 03/07/2015 05:12 πμ, Tuan Nguyen wrote:
>
> By the way, is the speed used in Graphhopper km/hour or mile/hour?
>
>
> I expect it to be units based on the SI system.
>
> --
> Emux
> Cruiser <http://wiki.openstreetmap.org/wiki/Cruiser> - Atlas
> <http://wiki.openstreetmap.org/wiki/Atlas_%28navigation_application%29>
>
>
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