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[mkgmap-dev] Data / routing issue - Vancouver, BC ferries

From Samuel Longiaru longiaru at shaw.ca on Wed Jun 14 01:17:59 BST 2017

Thanks for getting back...

1) --keep-complete in splitter - yes.  I figured with the long routes
and few nodes that this could be a possible point of failure so I made
sure to add it.

2) iWowik sent a PM suggesting that some of the important tags were
incorrect and/or missing and he was addressing some of them.  One
suggestion of his was to use Key:ferry to help maintain connectivity to
the roads.  Wiki states "With route
<http://wiki.openstreetmap.org/wiki/Tag:route%3Dferry>, this tag can
take the highway <http://wiki.openstreetmap.org/wiki/Key:highway>=*
classification of the roads it connects, like a bridge."  So the service
/ trunk_link issue Andrzej noted is very interesting.  If not given,
what road classification does the routing engine see for the ferry?

3) I made sure to untick the Toll Road avoidance thinking this may be an
issue as well, but no change.

OK... so it looks like there may be several issues at work here.  I
didn't realize that ferries were such a can of worms both from a mapping
and a routing perspective.   I expect that this service road issue is a
common problem with ferry mapping. Also, given the impact that ferries
can have on travel distance and time, unless explicitly avoided, perhaps
ferries should always be given a pretty high priority in routing?
They're more than just a stretch of 30km/hr highway.

Thanks for looking into this!

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