[mkgmap-dev] Bug in Road Merging - actually doubling roads.

Thu Mar 15 08:53:49 GMT 2018

Hi Felix,

further thoughts about this: Up to now we concentrate on problems caused by rouding errors when OSM (~32 bit) coordinates
are placed on the 24 Garmin raster.
What about places where OSM data already contains overlapping highways?
I think there is currently no code in mkgmap to handle this properly. Don't know if we can find rules to handle this,
if not we should print warning messages, as it is likely to cause trouble.
Overlapping can mean :
* two different OSM ways with identical sequences of 2 or more nodes, e.g. a-b-c-d and x-b-c-y
* two different OSM ways with identical sequences of 2 or more nodes, but in reversed order, e.g. a-b-c-d and x--d-c-y

My understanding is that these are mapping errors, but as said before there is no code to detect this. There might be
warnings, e.g. in the housenumber code.

Gerd

________________________________________
Von: mkgmap-dev <mkgmap-dev-bounces at lists.mkgmap.org.uk> im Auftrag von Gerd Petermann <gpetermann_muenchen at hotmail.com>
Gesendet: Mittwoch, 14. März 2018 17:25:22
An: mkgmap-dev at lists.mkgmap.org.uk
Betreff: Re: [mkgmap-dev] Bug in Road Merging - actually doubling roads.

Hi Felix,
yes, change it to a gigher value first.

Gerd

Felix Hartmann-2 wrote
> Hi Gerd,
>
> I get a huge huge list - and the ones I tried seemed to be quite alright -
> but the couple that I checked where simply ways that my styles inserts at
> least 3-4 times (usually ways with hiking/mtb route). Should I increase
> the
> counter in the patch to 5 (I guess still alright) or to 6 (I'm pretty sure
> I get routing errors then)?
>
> Felix

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