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bgcolor="#FFFFFF" text="#000000"><div style="font-size:
12pt;font-family: Verdana;">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? <br><br>Thanks<br><br>Cheerio
John<br><br><span>Nate Wessel wrote on 2019-03-21 1:49 PM:</span><br><blockquote
type="cite" cite="mid:8a11bd77-1c6d-11d6-3309-f660a9f9161e@gmail.com"><meta
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<p>Daniel, <br>
</p>
<p>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? <br>
</p>
<p>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. <br>
</p>
<p>Cheers,<br>
</p>
<div class="moz-signature">Nate Wessel<br>
<span style="font-size:10px;color:#777">Jack of all trades, Master
of Geography, PhD candidate in Urban Planning<br>
<a href="http://natewessel.com" moz-do-not-send="true">NateWessel.com</a></span>
<br>
<br>
</div>
<div class="moz-cite-prefix">On 3/19/19 12:58 PM, Begin Daniel
wrote:<br>
</div>
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<p class="MsoNormal">Hi all,<o:p></o:p></p>
<p class="MsoNormal">As mentioned a few weeks ago, I have almost
completed the development of a clean-up tool for the data to
be imported.<o:p></o:p></p>
<p class="MsoNormal">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.<o:p></o:p></p>
<p class="MsoNormal">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.
<o:p></o:p></p>
<p class="MsoNormal">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.<o:p></o:p></p>
<p class="MsoNormal">I should soon document the process in the
“Canada Building Import” wiki page (in a pre-processing
section).<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thought? Comments?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Daniel<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<br>
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