[Talk-ca] Municipal boundaries

Tue Mar 7 15:36:44 UTC 2017

James, it looks to me those differences are the result of a simplification
applied on the processing side.

And I also agree that good enough is usually more problems down the road.
We should adopt a standard. The only one I know of for the country is the
SGC and Paul is pointing out to an example of how Provinces have defined
boundaries.

We probably should look at a standard though if we wish to produce OSM
analysis that is consistent and reproducible. The problem I foresee with
the use of different and variable boundaries is that it will make OSM data
use inconsistent and not accurate.

What I understand form our discussion is that I should do more research on
what provinces are using and document this before doing anything and report
here. Thanks everyone for the feedback! Any more thoughts?

On Tue, Mar 7, 2017 at 10:11 AM, James <james2432 at gmail.com> wrote:

> Quebec's Open Data portal just points to the city portals which each have
> their own license....(usually CC-BY)
>
> https://www.donneesquebec.ca/fr/
>
> On Tue, Mar 7, 2017 at 9:42 AM, James <james2432 at gmail.com> wrote:
>
>> We also have to think if we are going with "good enough".... when we want
>> better the work that will be doubled to make the boundaries better.
>>
>> On Tue, Mar 7, 2017 at 9:38 AM, Paul Ramsey <pramsey at cleverelephant.ca>
>> wrote:
>>
>>> Municipalities are creatures of the provinces, the most likely source of
>>> complete, correct municipal boundaries will be the provincial government,
>>> though each municipality will generally know theirs (and sometimes disagree
>>> with neighbours, hence the utility of using a provincial file if available).
>>>
>>> Matching of CSDs with municipal boundaries is something StatsCan will
>>> attempt to achieve, but it's by no means a guarantee. If the goal is "good
>>> enough", CSDs are good enough. If the goal is to reflect reality,
>>> provincial data will always be preferable.
>>>
>>> e.g. https://catalogue.data.gov.bc.ca/dataset/municipalities
>>> -legally-defined-administrative-areas-of-bc
>>>
>>> P
>>>
>>>
>>> On Tue, Mar 7, 2017 at 6:31 AM, James <james2432 at gmail.com> wrote:
>>>
>>>> In purple/black CSD 2016, in gold Gatineau's city limits from their
>>>> open data portal:
>>>> http://i.imgur.com/undefined.png
>>>>
>>>> The CSDs do not match up with actual city bounds
>>>>
>>>> On Tue, Mar 7, 2017 at 9:20 AM, Bjenk Ellefsen <
>>>> bjenk.ellefsen at gmail.com> wrote:
>>>>
>>>>> Just to make sure we are talking about the same thing: Census
>>>>> Divisions are higher level and more regional boundaries. CSDs are municipal
>>>>> boundaries (in OSM, level 8).  http://www.statcan.gc.ca/eng/s
>>>>> ubjects/standard/sgc/2011/sgc-intro
>>>>>
>>>>> Can you give me an example of city limits that don't match a CSD or is
>>>>> not in the SGC? Usually, the standard for municipal boundaries are the
>>>>> CSDs. At least, as far as I know, this is the standard geography. When
>>>>> referring to actual city limits, which geographical classification is it
>>>>> referring to?
>>>>>
>>>>> Sorry for the questions, I am trying to understand what is the
>>>>> classification used if its not the CSDs.
>>>>>
>>>>> On Tue, Mar 7, 2017 at 9:11 AM, James <james2432 at gmail.com> wrote:
>>>>>
>>>>>> Bernie, I've also noticed that StatsCan boundaries seem to be a
>>>>>> generalization of an area vs the actual city limits
>>>>>>
>>>>>> On Tue, Mar 7, 2017 at 9:02 AM, Bernie Connors <
>>>>>> berniejconnors at gmail.com> wrote:
>>>>>>
>>>>>>> Bjenk,
>>>>>>>
>>>>>>>       In NB there are issues with some census boundaries not
>>>>>>> matching with our administrative boundaries. The issue I am aware of was
>>>>>>> with the county boundaries. The census data that is analogous to our county
>>>>>>> boundaries included some significant deviations to prevent a municipality
>>>>>>> from being bisected by a county boundary. Please be careful that there is
>>>>>>> not a similar issue with the CSD boundaries. NB municipal boundaries can be
>>>>>>> downloaded from the GeoNB Data Catalogue For comparison to the CSD data.
>>>>>>>
>>>>>>> Bernie.
>>>>>>>
>>>>>>> Sent from my BlackBerry 10 smartphone on the Bell network.
>>>>>>> *From: *Bjenk Ellefsen
>>>>>>> *Sent: *Tuesday, March 7, 2017 9:51 AM
>>>>>>> *To: *talk-ca at openstreetmap.org
>>>>>>> *Subject: *[Talk-ca] Municipal boundaries
>>>>>>>
>>>>>>> Hello,
>>>>>>>
>>>>>>> Municipal boundaries correspond to census subdivisions (CSD). I have
>>>>>>> seen that many municipalities do not have a boundary yet. Is it ok if I
>>>>>>> start adding some boundaries based on CSDs? Having the boundaries is
>>>>>>> important to make extractions and analysis at the municipal level.
>>>>>>>
>>>>>>> Bjenk
>>>>>>>
>>>>>>>
>>>>>>> _______________________________________________
>>>>>>> Talk-ca mailing list
>>>>>>> Talk-ca at openstreetmap.org
>>>>>>> https://lists.openstreetmap.org/listinfo/talk-ca
>>>>>>>
>>>>>>>
>>>>>>
>>>>>>
>>>>>> --
>>>>>> 外に遊びに行こう！
>>>>>>
>>>>>
>>>>>
>>>>
>>>>
>>>> --
>>>> 外に遊びに行こう！
>>>>
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>>>> Talk-ca at openstreetmap.org
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>>>>
>>>>
>>>
>>
>>
>> --
>> 外に遊びに行こう！
>>
>
>
>
> --
> 外に遊びに行こう！
>
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