[Talk-ca] Canvec source tags

[Frank Steggink]

On 19-12-2011 22:40, Frank Steggink wrote:
> On 19-12-2011 22:20, john whelan wrote:
>> But recently I noted that the CANVEC tags are being removed.  Two 
>> people in the talk-ca list mentioned recently they had done so.
>>
>> Cheerio John
> According to my mailbox the answers were different. Jonathan mentioned 
> that he used other data sources, so the data wasn't significantly 
> Canvec anymore. Gordon didn't mention he removed tags, he just offered 
> a possible reason. As to your question in that thread, and not knowing 
> the user you were referring to, I was just wondering whether you sent 
> him/her a PM and asked about the reason (but I didn't bother to post 
> that to the mailing list). So, did you ask that user directly?
>
> Also Bing has stated that they should be attributed. That is one of 
> the conditions they provided their imagery to OSM. Of course everyone 
> knows that the source tags aren't absolute guarantees. It is also not 
> practical to enforce them. If that would happen, OSM would not develop 
> as it does right now, so although I would oppose removing source tags 
> knowingly (when the data is not altered significantly), there are many 
> shades of grey. It is often hard to draw a boundary, so we have to 
> rely on the good intentions of the mappers. That makes a project like 
> OSM both challenging and charming :)
>
> Regards,
>
> Frank
>
John,

I've got a question for you. I'm planning to (finally) clean up the 
forests / residential areas in Quebec City for some time. [1] I'll 
probably do this around Christmas. For this task I'll rely on the Bing 
imagery. How should I tag the polygons I create / modify? Should I leave 
"Canvec" intact as a source, use "Bing", or should I cut up the polygons 
in two? The only difference between the new parts will be the attribution.

I usually use a mixed tag in such cases (like source=Canvec;Bing). But 
since OSM has many users, many which are not experienced and/or do not 
care about these issues, can you realistically expect that everyone will 
take care about attribution properly?

Regards,

Frank

[1] http://osm.org/go/cKZOMVgi-