[mkgmap-dev] overlapping highways and route restrictions

Wed Apr 4 09:54:32 BST 2018

Hi Felix,

yes, 1) would handle the case in my example.
Just to make sure: I meant turn restrictions, not route relations.

Gerd

________________________________________
Von: mkgmap-dev <mkgmap-dev-bounces at lists.mkgmap.org.uk> im Auftrag von Felix Hartmann <extremecarver at gmail.com>
Gesendet: Mittwoch, 4. April 2018 10:48:20
An: Development list for mkgmap
Betreff: Re: [mkgmap-dev] overlapping highways and route restrictions

For my maps 1) is enough - and warning not even needed. I think it's hard to find out what the outcome should be.
The case of overlapping ways being part of different route relations on the other hand I've seen quite often - in that case I think it's best to just add all route relations to one way, and remove the other one.

The example you found here - I think is quite possible to solve - both restriction relations are identical - so one way including the restriction relation can be removed, the route relations copied over. If the restriction is having different rules - then however I don't think we can solve it correctly (well an exception is if we have overlapping ways in OSM which are oneway and opposite to each other - this is a rare case where overlapping ways are not to be removed I guess).

On 4 April 2018 at 10:39, Gerd Petermann <GPetermann_muenchen at hotmail.com<mailto:GPetermann_muenchen at hotmail.com>> wrote:
Hi all,

please help, I just try to make up my mind what mkgmap should do when it finds overlapping road segments and
one (or both) of the overlaps is a part of a (valid) restriction relation.  This doesn't happen very often, but it is possible.

The attached example contains these two overlapping ways, and both are members of (different) restriction relations:
https://www.openstreetmap.org/way/48218016
https://www.openstreetmap.org/way/48218008

(I did not try what the trunk version produces for this mess)

I see different possibilities:
1) ignore route restrictions when removing overlaps, remove those which are invalid after overlapping segments were removed and log a warning
2) ignore overlaps when the ways are members of restriction relations
3) complex: remove overlaps but try to "repair" the restriction

I am currently trying to implement 3) but it looks too complicated for such a rare case and in the end we have a clear case of wrong input data here.
What do you think?

Gerd

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