[OSM-talk] Argh, Canvec imports

David Groom reviews at pacific-rim.net
Thu Nov 17 17:13:32 GMT 2011

> ----- Original Message ----- 
> From: "Michal Migurski" <mike at stamen.com>
> To: "Talk Openstreetmap" <talk at openstreetmap.org>
> 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:


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


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