[Talk-ca] Building Import update

[Pierre Béland]

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 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 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 
 
  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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