Well noted. Maybe we could start a project out of it a later time with everyone in this thread. It will require research and preparation.
B Sent from my iPhone > On Mar 7, 2017, at 11:03 AM, Denis Carriere <[email protected]> wrote: > > I just want to re-enforce the comment that Kevin Farrugia made. > > Boundaries are one of the most complex features to add in OpenStreetMap. They > usually consist of relations that share borders with roads/rivers/other > boundaries. > > If ever there is an import of boundaries, the users doing the import have to > be VERY experienced with using relations and understand how they work. > > This goes way beyond adding simple building footprints :) > > I'm sure this can be accomplished with the group of people who replied to > this thread. > > Documentation is key for this type of work. > > ~~~~~~ > Denis Carriere > GIS Software & Systems Specialist > >> On Tue, Mar 7, 2017 at 10:36 AM, Bjenk Ellefsen <[email protected]> >> wrote: >> 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 <[email protected]> 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 <[email protected]> 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 <[email protected]> >>>>> 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 <[email protected]> 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 >>>>>>> <[email protected]> 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/subjects/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 <[email protected]> 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 >>>>>>>>> <[email protected]> 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: [email protected] >>>>>>>>> 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 >>>>>>>>> [email protected] >>>>>>>>> https://lists.openstreetmap.org/listinfo/talk-ca >>>>>>>>> >>>>>>>> >>>>>>>> >>>>>>>> >>>>>>>> -- >>>>>>>> 外に遊びに行こう！ >>>>>>> >>>>>> >>>>>> >>>>>> >>>>>> -- >>>>>> 外に遊びに行こう！ >>>>>> >>>>>> _______________________________________________ >>>>>> Talk-ca mailing list >>>>>> [email protected] >>>>>> https://lists.openstreetmap.org/listinfo/talk-ca >>>>>> >>>>> >>>> >>>> >>>> >>>> -- >>>> 外に遊びに行こう！ >>> >>> >>> >>> -- >>> 外に遊びに行こう！ >> >> >> _______________________________________________ >> Talk-ca mailing list >> [email protected] >> https://lists.openstreetmap.org/listinfo/talk-ca >> >
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