I like the idea of building a consensus on a building import.
More seriously if we can get any sort of consensus I'll be more than happy.
Cheerio John
Begin Daniel wrote on 2019-03-21 2:40 PM:
Oupsssss, I still miss the “reply all” button
*From:*jfd...@hotmail.com
*Sent:* Thursday, March 21, 2019 14:36
*To:* 'Nate Wessel'
*Subject:* RE: [Talk-ca] Building Import
Hi all,
Concerning the pre-processing, let’s try/check first the
“orthogonalization” component then, if there is a consensus on the
validity of the result, we can build on it J
Daniel
*From:*Nate Wessel [mailto:bike...@gmail.com]
*Sent:* Thursday, March 21, 2019 14:30
*To:* John Whelan
*Cc:* talk-ca@openstreetmap.org
*Subject:* Re: [Talk-ca] Building Import
I've specifically and repeatedly requested that the tasking manager be
taken down while this project is reworked... though that doesn't
pertain directly to the email I just sent.
Nate Wessel
Jack of all trades, Master of Geography, PhD candidate in Urban Planning
NateWessel.com <http://natewessel.com>
On 3/21/19 2:02 PM, John Whelan wrote:
Nate are you requesting something specific on the Canadian task
manager for Toronto at this time or would you prefer to look
through Daniel's work first?
Thanks
Cheerio John
Nate Wessel wrote on 2019-03-21 1:49 PM:
Daniel,
This is exciting news! After much talk on this list, it seems we
may have some actual progress toward fixing the various data
quality issues. Would you mind sharing some of your code, or a
description of your workflow here or on GitHub or the like so we
can take a look?
One thing you didn't mention which I think will be really
critical, especially in central Toronto: We need to remove
buildings from the import dataset that may already be mapped in
OSM. That is, buildings that overlap with existing buildings. For
this import to make any sense in Central Toronto, we need
conflation to move slowly, and in smaller, more manageable steps.
Buildings that are already mapped should be checked manually at a
later time in batches that a skilled human can manage in less than
an hour. The tasking manager as it's currently set up would have
all of downtown conflated by hand in one task by a single mapper -
a recipe for disaster I'm sure, given how detailed the map is in
that area.
Cheers,
Nate Wessel
Jack of all trades, Master of Geography, PhD candidate in Urban
Planning
NateWessel.com <http://natewessel.com>
On 3/19/19 12:58 PM, Begin Daniel wrote:
Hi all,
As mentioned a few weeks ago, I have almost completed the
development of a clean-up tool for the data to be imported.
So far, it removes nonessential vertices, orthogonalizes
building corners when reasonable and ensures walls’ alignment
within given tolerances. Building footprints that can’t be
processed completely are flagged accordingly, so they could be
examined thoroughly at import time.
Eventually, It should be easy to remove overlapping buildings
(potentially generated from a 3d mapping), but I doubt that
splitting terrace into individual buildings can be done
automatically.
The tool uses some parameters that need to be adjusted. I
would like that those who are interested in this aspect of the
import send me benchmark data that could be problematic. I
will process them to adjust parameters and/or the tool, and I
will send back the results to the sender for a thorough
examination.
I should soon document the process in the “Canada Building
Import” wiki page (in a pre-processing section).
Thought? Comments?
Daniel
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