[mkgmap-dev] Duplicate roads added by default style

Mon May 10 15:56:18 BST 2021

HI Gerd,

I would ideally like a new mkgmap tag that if found would remove the
duplicated way or part of a way. This could get tricky when the part to be
deleted is in the middle of the way, as it would need to produce two ways.
Something like:

railway=platform {set mkgmap:removeoverlap=true} [0x16 road_class=0
road_speed=0 resolution 23]

The code would need to check that the access of the overlapping way and
could merge the accesses if necessary. A decision would also have to be made
what to do if two overlapping ways both have the tag set.

Cheers,
Mike

-----Original Message-----
From: Gerd Petermann [mailto:gpetermann_muenchen at hotmail.com] 
Sent: 10 May 2021 10:21
To: Development list for mkgmap <mkgmap-dev at lists.mkgmap.org.uk>
Subject: Re: [mkgmap-dev] Duplicate roads added by default style

Hi Felix,

sure, I meant roads which RoadMerger would combine. Roadmerger checks a lot
more attributes.
Multiple (different) routable ways for one OSM way are quite normal, esp.
with the --make-opposite-cycleways option.

I think it's worth to log a warning for each.

Gerd

________________________________________
Von: mkgmap-dev <mkgmap-dev-bounces at lists.mkgmap.org.uk> im Auftrag von
Felix Hartmann <extremecarver at gmail.com>
Gesendet: Montag, 10. Mai 2021 11:16
An: Development list for mkgmap
Betreff: Re: [mkgmap-dev] Duplicate roads added by default style

It makes the style very complicated to try to remove any identical copies -
I do this by setting loads of temporary keys, that are checked later for
existing or not existing and based on that add or not add other lines.  I
guess some actual duplicates will still happen.

On Mon, 10 May 2021 at 17:14, Felix Hartmann
<extremecarver at gmail.com<mailto:extremecarver at gmail.com>> wrote:
hmm no, please no warning. This can be very beneficial. As long as the type
OR road_speed OR road_class OR oneway plus direction is different. The above
of course makes no sense, as it will set exactly the same road twice.

On Mon, 10 May 2021 at 16:49, Gerd Petermann
<GPetermann_muenchen at hotmail.com<mailto:GPetermann_muenchen at hotmail.com>>
wrote:
Hi all,

while double checking patch for the RoadMerger I wondered what might happen
if the style adds two or more identical roads for the same OSM way.
Of course this makes no sense but to my surprise I found out that this
really happens with the default style.
A way with e.g. highway=footway and railway=platform is added twice
...
highway=footway {set tmp:stopMopUp=yes} [0x16 road_class=0 road_speed=0
resolution 23 continue with_actions]
...
railway=platform [0x16 road_class=0 road_speed=0 resolution 23]

Of course the default style should be fixed to avoid that but I think mkgmap
can detect this easily and should print a warning when the style does that?

Gerd
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--
Felix Hartman - Openmtbmap.org & VeloMap.org

--
Felix Hartman - Openmtbmap.org & VeloMap.org