----- Original Message -----
From: "Frank Steggink" <[email protected]>
To: <[email protected]>
Sent: Thursday, November 17, 2011 7:03 PM
Subject: Re: [OSM-talk] Argh, Canvec imports
On 17-11-2011 18:13, David Groom wrote:
----- Original Message ----- From: "Michal Migurski" <[email protected]>
To: "Talk Openstreetmap" <[email protected]>
Sent: Thursday, November 17, 2011 7:40 AM
Subject: [OSM-talk] Argh, Canvec imports
A cry of frustration:
I do bimonthly runs of the worldwide coastlines
(http://metro.teczno.com/#coastline), and Canada seems to be a recurring
source of problems. What the heck is going on up there? I consistently
see
new imports of what seems to be Canvec data screwing up coastlines and
making for some deeply broken renders:
http://mike.teczno.com/img/broken-coast.png
Most of that junk in the Atlantic Ocean is newly introduced within the
last
few weeks, and is making it difficult to get out a clean coastline
suitable
for rendering. It shows up in the main OSM mapnik tiles in Hudson Bay,
too:
http://www.openstreetmap.org/?lat=55.7&lon=-83.6&zoom=5&layers=M
I've been trying to fix problems as I encounter them and I've managed to
fix
invalid coastilnes around Baltimore, Houston, Tampa and the dreaded
Montréal
area in an effort to generate a usable map of North America, but this
Canvec
stuff is absolutely killing me.
-mike.
I know, this just looks so wrong to me:
http://www.openstreetmap.org/browse/relation/1619985
http://www.openstreetmap.org/browse/relation/1613190
http://www.openstreetmap.org/browse/relation/1618562
and although these relations are not in themselves creating problems,
there's an error at
http://www.openstreetmap.org/?lat=45.11737&lon=-66.52564&zoom=15 , which
is difficult to fix without knowing how the ways making up these
relations are eventually going to end up.
Although over the last few months I've been going round trying to fix
coastline errors in the rest of the world, I'm afraid that I've virtually
given up trying to do anything in Canada
David
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Hi David,
Did you already contact that user?
Frank
I haven't contacted the user, because from reading
http://wiki.openstreetmap.org/wiki/Canvec I could not find enough
information to tell him what he should be doing.
I will however now contact him and copy the information you have given
below, and suggest he ask on talk-ca if he has any other problems
Regards
David
This error is caused because the prepared Canvec OSM files also contain
waterbodies (natural=water) for areas which are actually in the ocean.
Someone importing Canvec is supposed to convert the boundaries to
coastlines (except for the sheet boundaries), and replace them with the
existing coastline, joining up at the sheet boundaries.
Frank
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