> From: steve@parabola.me.uk
> Date: Fri, 11 Oct 2013 23:21:59 +0100
> To: mkgmap-dev@lists.mkgmap.org.uk
> Subject: Re: [mkgmap-dev] [Patch v1] Don't write useless data to NET file
>
>
>
>
> >@Steve: I assume that the Garmin maps contain also
> >data for lower resolutions in NET, so maybe they also
> >have NOD data that points to this while we have not?
>
> I doubt that the data is useless, since that is how the maps are meant to be. I do not know what it is for, but I would guess it would be only used on a GPS device and that it would have nothing directly to do with auto-routing, since it is NOD that controls that.
>
> It could be just used as an optimisation, rather than being essential. Or it may not be used on modern devices. Anyway lots of investigation needed before declaring it un-used.
>
> I've noticed that we only ever seem to have one road segment in one NET entry, whereas there can be more than one. (And I thought at one time there really was multiple segment combined.)
>
> Having a single NET entry containing multiple road lines might help routing by reducing the number of entries in NOD
>
> Of course if we are writing the wrong thing then that is kind of useless :-) and I would not be surprised if there were several bugs.
>
> ..Steve
>
>
>
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