[mkgmap-dev] type=through_route relations and mkgmap r3743

Tue Jan 10 11:22:33 GMT 2017

Hi Paul,

sorry , I still have no idea what the wanted effect is. If you think that my example is tagged correctly,
in what case should it change the routing hints and to what?
Or maybe point me to another example.

thanks,
Gerd
________________________________________
Von: mkgmap-dev <mkgmap-dev-bounces at lists.mkgmap.org.uk> im Auftrag von News <news at pointdee.co.uk>
Gesendet: Dienstag, 10. Januar 2017 11:55:06
An: mkgmap-dev at lists.mkgmap.org.uk
Betreff: Re: [mkgmap-dev] type=through_route relations and mkgmap r3743

If I remember correctly the idea of a through_route was first raised by
Mark Burton a few years ago. It was intended to solve the problem of
TOTSO's
(https://en.wikipedia.org/wiki/Glossary_of_road_transport_terms#TOTSO)
which is a situation where you have to turn off the carriageway you are
currently travelling on in order to stay on the same named road. In
these circumstances it is (almost) impossible for any routing engine to
deduce that it needs to give you a routing hint in order for you to stay
on the road that you are currently on. At the time I had a couple of
these near me where I knew that my Garmin was effectively missing a turn
and hence you would end up travelling in the wrong direction. Adding a
through_route at these places fixes this problem.

There is also a secondary use where a road e.g. Smith Road, bends 90
degrees and you are sometimes told to turn left/right to stay on Smith
Road even though there is no turning

A few years ago I tried to get this accepted into the list of official
tags however the vote resulted in a draw and I didn't have chance to
pursue it further.

I have now moved and there are none currently near me that I could use
to check if this is still working

See also......
http://www.mkgmap.org.uk/pipermail/mkgmap-dev/2013q2/017429.html
http://www.mkgmap.org.uk/pipermail/mkgmap-dev/2010q1/007028.html

Thanks

Paul

On 01/10/2017 08:31 AM, Gerd Petermann wrote:
> I found one that might be interesting:
> https://www.openstreetmap.org/relation/406379
>
> If I got that right the intention was to tell mkgmap that
> it should change the bearing (heading) values in the map so that the Garmin
> algo doesn't produce a
> hint like "Turn left onto Calle Botánico Rivas Mateos" when travelling from
> way 24647941 (Calle José Luis Cotallo) to way 24311294 (Calle Botánico Rivas
> Mateos).
> (this is what happens now)
>
> What would you want instead?
> @Carlos: You have created that relation in 2010, maybe you remember?
>
> Gerd
>
>
>
>
> Gerd Petermann wrote
>> Hi all,
>>
>> I've noticed that mkgmap still checks these relations for correctness but
>> they have no influence on the created map.
>> Part of the code that handled them was removed with r3649:
>> http://www.mkgmap.org.uk/websvn/revision.php?repname=mkgmap&rev=3649
>>
>> If your map was created with r3743 or later, please check if you find a
>> crossing with such a relation which where routing
>> hints are wrong. In that case I would try to add code for the support,
>> else some unused code can be removed.
>>
>> Gerd
>> _______________________________________________
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>
>> mkgmap-dev at .org
>
>> http://www.mkgmap.org.uk/mailman/listinfo/mkgmap-dev
>
>
>
>
>
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