[mkgmap-dev] Roundabout checks

Wed Aug 3 09:06:34 BST 2016

Hi Mike,

I've tried to collect special cases reg. this. I've seen places with a  road going straight through a roundabout .

I assume one is not allowed to enter the roundabout from these roads, but I don't know how this is

correctly mapped. Such a road might be split into multiple OSM ways. The wiki about roundabouts doesn't

mention this case, maybe because it isn't a roundabout in this case?

Another problem: A way may not end at the roundabout, it may build some kind of v-shape only touching the roundabout.

I think this is not correct mapping and should be flagged.

Do you see others?

Gerd

________________________________
Von: mkgmap-dev <mkgmap-dev-bounces at lists.mkgmap.org.uk> im Auftrag von Gerd Petermann <GPetermann_muenchen at hotmail.com>
Gesendet: Mittwoch, 27. Juli 2016 14:33:38
An: Development list for mkgmap
Betreff: Re: [mkgmap-dev] Roundabout checks

Hi Mike,

yes, I can reproduce the problem. I just wonder if mkgmap can fix the problem as well,

not only report it. Maybe it also depends on oneway attributes on the roads joining onto

the roundabout.

I'll have a closer look later.

Gerd

________________________________
Von: mkgmap-dev <mkgmap-dev-bounces at lists.mkgmap.org.uk> im Auftrag von Mike Baggaley <mike at tvage.co.uk>
Gesendet: Mittwoch, 27. Juli 2016 14:16:14
An: 'Development list for mkgmap'
Betreff: Re: [mkgmap-dev] Roundabout checks

I have rebuilt this area of the map with the default style, and the result is the same.

Regards,
Mike

From: Mike Baggaley [mailto:mike at tvage.co.uk]
Sent: 27 July 2016 13:14
To: 'Development list for mkgmap' <mkgmap-dev at lists.mkgmap.org.uk>
Subject: RE: [mkgmap-dev] Roundabout checks

HI Gerd, at roundabout way 336004297, if you route from way 52026730 (Manor Court Street), which has a common point on the roundabout with way 208232611 (Newcastle Road), to way 48846175 (St. Thomas Place), BaseCamp says :

1. Manor Court Street, N53° 00.034' W2° 11.801'
2. Get on Manor Court Street and ride north, 0 m, 0 m, 180.0° true, N53° 00.034' W2° 11.801'
3. Enter roundabout Roundabout, 63 m, 9 s, 63 m, 9 s, 7.1° true, N53° 00.068' W2° 11.795'
4. Take the 1st left onto St. Thomas Place, 17 m, 13 s, 81 m, 22 s, 50.3° true, N53° 00.076' W2° 11.791'
5. St. Thomas Place, 22 m, 6 s, 102 m, 28 s, 0.0° true, N53° 00.087' W2° 11.786'

Point 4 should be the 2nd left.

I am using my own style, but do not think this will make any difference.

Regards,
Mike

From: Gerd Petermann [mailto:GPetermann_muenchen at hotmail.com]
Sent: 27 July 2016 11:40
To: Development list for mkgmap <mkgmap-dev at lists.mkgmap.org.uk<mailto:mkgmap-dev at lists.mkgmap.org.uk>>
Subject: Re: [mkgmap-dev] Roundabout checks

Hi Mike,

I think you cannot do those checks in the style.

Do you have example cases for wrong exit numbers

with the default style? Or with a style that I can try as well?

I think I also saw this problem during my last cycling tour

through Italy, but was too lazy to stop and note any details,

in the meanwhile Minko changed the style rules for roundabouts,

so I stoped thinking about it.

Gerd

________________________________
Von: mkgmap-dev <mkgmap-dev-bounces at lists.mkgmap.org.uk<mailto:mkgmap-dev-bounces at lists.mkgmap.org.uk>> im Auftrag von Mike Baggaley <mike at tvage.co.uk<mailto:mike at tvage.co.uk>>
Gesendet: Mittwoch, 27. Juli 2016 12:26:31
An: 'Development list for mkgmap'
Betreff: [mkgmap-dev] Roundabout checks

Hi, I wonder whether we could add a check that any highways joining onto a roundabout only do so at the end of way, and that no more than one way joins the roundabout at any given node? This would highlight roundabouts that do not adhere to the rule of having a separate node for each entrance and exit - I believe these cause the GPS to display the incorrect exit number when routing. I suspect this check would  too complex to be done in a style file.

Regards,
Mike
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