[Talk-ca] Multipolygon problems

[Begin Daniel]

Bonjour all

Concerning Canvec data and multipolygon relations,

The problem of multipolygon relations having the feature tag also associated with the outer ring may appear over all multipolygon relations (water, wood, whatever…) and on all currently available version of the Canvec product (6-10).

However, using the example provided by Stewart, I have not been able to reproduce the problem with the latest version of FME so the writer must have been corrected since. According to FME’s documentation “the multipolygon relation that is written out follows the rules and examples described in http://wiki.openstreetmap.org/wiki/Relation:multipolygon.”

Consequently, if a new version of Canvec is ever made available, I expect it should respect the OSM schema, at least on this aspect. In any case, one must conform to the general imports rules and to what has been said about Canvec data on this list.

Cheers,
Daniel
From: Begin Daniel [mailto:jfd553 at hotmail.com]
Sent: Monday, 3 July, 2017 16:00
To: Alan Richards; Stewart C. Russell
Cc: talk-ca at openstreetmap.org
Subject: Re: [Talk-ca] Multipolygon problems

Thanks everyone,
Stewart sent me an example I can use ☺
Daniel

From: Begin Daniel [mailto:jfd553 at hotmail.com]
Sent: Monday, 3 July, 2017 09:53
To: Alan Richards; Stewart C. Russell
Cc: talk-ca at openstreetmap.org<mailto:talk-ca at openstreetmap.org>
Subject: Re: [Talk-ca] Multipolygon problems

If someone could provide me with an example of a relatively small, untouched multipolygon imported directly from Canvec having the problem, I could make some tests and sent it to FME to have their translator corrected if I can reproduce the problem.

Daniel

From: Alan Richards [mailto:alarobric at gmail.com]
Sent: Monday, 3 July, 2017 00:51
To: Stewart C. Russell
Cc: talk-ca at openstreetmap.org<mailto:talk-ca at openstreetmap.org>
Subject: Re: [Talk-ca] Multipolygon problems

Thanks for a good workflow - I cleared up 8 so far pretty quickly around Hope, BC. There's a bunch in a cluster around Merritt too. I'm guessing it's certain imports or import authors vs others that makes the difference.

alarobric

On Sun, Jul 2, 2017 at 3:40 PM, Stewart C. Russell <scruss at gmail.com<mailto:scruss at gmail.com>> wrote:
On 2017-07-02 04:41 PM, Begin Daniel wrote:
>
> However, since the same translator was used for all the polygons, the
> problem should also appear on water bodies, etc. The problem may have
> been related to the complexity of the polygons to convert.

Hi Daniel - yes, I'm seeing a bunch of water relations with the same
problem, such as on the Grand River
<https://www.openstreetmap.org/relation/576317> and also parts of the
Speed near Guelph. Some of these data were imported from Canvec 10.

> I also found that JOSM had similar problems with tag transfers a few
> years ago (1). Maybe some of the problems found result from merging
> nearby wooded areas?
>
> Daniel
>
> (1) https://josm.openstreetmap.de/ticket/9832.

Interesting, but I'm seeing a lot of the problem water relations
worldwide (well, Scotland and Germany) where JOSM wasn't involved. So
while the JOSM issue might have contributed a little, there were other
factors in play. Indeed, I've even seen changesets (such as 5735148 from
Sep 2010) where the editor had to duplicate the relation tag in the
outer way to get the inner features to render!

cheers,
 Stewart

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