[Talk-ca] Building Import update

[john whelan]

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 <pierzenh at 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 <
> jwhelan0112 at 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 <bike756 at 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
>
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