[Talk-ca] Floating Island Error

Adam Martin s.adam.martin at gmail.com
Mon Jan 6 21:19:38 UTC 2014


Based on an earlier discussion on the OSM Canada board, I've been trying to
figure out what is the best way of correcting the floating island error
that has been plaguing the Province of Newfoundland and Labrador.

Specifically, the error occurs from two directions. The first is localized
on the Cape Breton island area of Nova Scotia (for example,
http://keepright.ipax.at/report_map.php?schema=104&error=25004109) and the
other is located along the northern coast of Quebec (for example,
http://keepright.ipax.at/report_map.php?schema=20&error=5357196).

>From the prior discussion, I decided to wait a couple of weeks in order to
ensure that the floating island errors were real and not some sort of
processing error. The problem has proved to be persistent. From reviewing
the areas in ID and Potlach 2, they seem to relate somehow to the
importation of CanVec v6.0 data into the map. In each case, the line
separating the "connected" from the "disconnected" is an arbitrary one
represented by a polygon area designated as "wood".

Interestingly, the error is ignored in the navigation application I tried.
Inverness routes south to Port Hawkesbury without any problems. This points
to the issue being on Keeprights side and not the actual map. If that is
the case, then there is little problem, other than that keepright cannot be
relied upon to identify floating island within Newfoundland, Labrador, part
of Quebec and part of Nova Scotia. I'm not sure if potentially rolling back
the imports would make a difference. In that case, I would ask a more
seasoned mapper with experience with reversions and imports to actually
perform such a thing.

Let me know what you think.

Adam
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.openstreetmap.org/pipermail/talk-ca/attachments/20140106/58b6cd8b/attachment.html>


More information about the Talk-ca mailing list