The Ottawa building outline import was done by the local Ottawa mappers to a standard they were happy with.
Cheerio John On Sun, 3 Feb 2019 at 14:42, Pierre Béland <pierz...@yahoo.fr> wrote: > De tes exemples sortis du chapeau ne font pas avancer la discussion. > > J'attends la démonstration de John que les données d'import pour Ottawa > représentent bien le contour des bâtiments et sont des données de qualité. > > Pierre > > > Le dimanche 3 février 2019 12 h 07 min 55 s HNE, john whelan < > jwhelan0...@gmail.com> a écrit : > > > From OSMweekly 445 and I'm not sure if it is relevant or not. > > Cheerio John > > Imports > > - Frederik Ramm suggested > > <https://lists.openstreetmap.org/pipermail/imports/2019-January/005902.html> > reverting a four-year-old building import in Ulster County, New York State, > because only simple squares had been imported instead of the correct > building outlines. Two years ago the import was featured > > <http://worstofosm.tumblr.com/post/148016716836/in-ulster-county-ny-people-live-in-small-square> > by *Worst of OSM*. > > > On Sat, 2 Feb 2019 at 10:57, Nate Wessel <bike...@gmail.com> wrote: > > If they weren't hand traced, how were they made? I don't believe I've > actually seen any documentation on this. Do we know how these buildings > footprints were made? Just because we didn't trace them from imagery > ourselves doesn't mean someone working for a city GIS department didn't do > exactly the same thing some time ago. > > We're concerned with squaring because buildings generally have right > angles. If the data don't have right angles too, then like you said it > likely indicates poor quality data. > > Best, > Nate Wessel > Jack of all trades, Master of Geography, PhD candidate in Urban Planning > NateWessel.com <http://natewessel.com> > > On 2/2/19 10:48 AM, Danny McDonald wrote: > > On squaring buildings, no one has yet been explained why buildings should > be square. My understanding is that non-square buildings are a warning > sign for mapathons with hand-traced buildings - the lack of squaring is > often noticeable for hand-traced buildings, and indicative of generally > poor building footprints. That doesn't apply here, since the buildings > involved are not hand-traced (at least in Toronto). In fact, the imported > footprints are generally extremely accurate, much better than would (or > could) be done by hand. > > It seems like the automated verification tool (of checking whether > buildings are square or not) is being misapplied in this case. > > DannyMcD > > _______________________________________________ > Talk-ca mailing > listTalk-ca@openstreetmap.orghttps://lists.openstreetmap.org/listinfo/talk-ca > > _______________________________________________ > Talk-ca mailing list > Talk-ca@openstreetmap.org > https://lists.openstreetmap.org/listinfo/talk-ca > > _______________________________________________ > Talk-ca mailing list > Talk-ca@openstreetmap.org > https://lists.openstreetmap.org/listinfo/talk-ca >
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