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
<[email protected]> 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 <[email protected]> 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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