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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