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bgcolor="#FFFFFF" text="#000000"><div style="font-size:
12pt;font-family: Verdana;">I'll contact you directly off list to
address your concerns.<br><br>Thanks John<br><br><span>Nate Wessel wrote
on 2019-01-17 10:28 AM:</span><br><blockquote type="cite"
cite="mid:f514404b-4c3d-27d9-04f2-e97d929d94df@gmail.com"><meta
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<p>I just learned yesterday of a very large import of buildings
across Canada that seems to have been posted to this list in
November without getting much of a response. I remember seeing the
email about it at the time, and as there was substantial reference
to an import in Ottawa, I thought the import was limited to that
city and failed to read the actual details of the proposal. This
appears to be an import of building footprints across ALL MAJOR
CANADIAN CITIES. <br>
</p>
<p><a class="moz-txt-link-freetext"
href="https://wiki.openstreetmap.org/wiki/WikiProject_Canada/Canada_Stats_Canada_Building_Outlines_Import/Plan"
moz-do-not-send="true">https://wiki.openstreetmap.org/wiki/WikiProject_Canada/Canada_Stats_Canada_Building_Outlines_Import/Plan</a><br>
</p>
<p><a class="moz-txt-link-freetext"
href="https://lists.openstreetmap.org/pipermail/imports/2018-November/005812.html"
moz-do-not-send="true">https://lists.openstreetmap.org/pipermail/imports/2018-November/005812.html</a></p>
<p>This is being imported NOW, very quickly, and the data I've seen
in Toronto is of dubious quality at best. Given the speed with
which this has taken place and the lack of clear discussion about
what exactly the import is, what exactly it covers, I would like
to see this import effort halted immediately if not reverted. <br>
</p>
<p>My concerns are as follows:</p>
<p>1. I'm a very active mapper living and editing in Toronto and
subscribed to the relevant lists and slack channels, yet I only
just learned of this when the buildings encroached on my own
neighborhood. I imagine many others also missed the notice and
have not had any chance to review the plan.<br>
</p>
<p>2. There are countless examples of truly terrible data quality,
weird footprints, overlapping buildings, wildly unsimplified
geometries, etc. e.g. <br>
<a class="moz-txt-link-freetext"
href="https://www.openstreetmap.org/way/663824488"
moz-do-not-send="true">https://www.openstreetmap.org/way/663824488</a><br>
<a class="moz-txt-link-freetext"
href="https://www.openstreetmap.org/way/662764169"
moz-do-not-send="true">https://www.openstreetmap.org/way/662764169</a><br>
etc. <br>
These issues clearly fail in a simple JOSM validation, which
indicated that no validation is happening before upload.<br>
</p>
<p>3. The data is being imported in extremely large chunks, (see the
tasking manager grid for Ontario:
<a class="moz-txt-link-freetext"
href="http://tasks.osmcanada.ca/project/145" moz-do-not-send="true">http://tasks.osmcanada.ca/project/145</a>),
much larger I think than
any one person could validate or review in a single sitting. There
are more than ten thousand buildings in some of these grid cells.
As changesets are limited to 10k objects, including nodes, it is
extremely difficult to see what data was there before these
changes, as each task involves multiple essentially simultaneous
changesets. <br>
</p>
<p>4. The approach seems to be import first, validate second (if
ever?). <br>
</p>
<p>5. The wiki plan gives no clear description of the plan for
integrating new data with old. In places where there used to be
user-contributed buildings, I now see buildings from this import
covering or replacing those buildings with no remaining way
history. I don't think I need to say that this is completely
unacceptable. <br>
</p>
<p>What are the options on the table here? There has been a truly
massive amount of data imported in the last couple of weeks. I'd
love to wind back time and criticize the living hell out of this
plan before it started, but that's not where we're at. What can be
done?<br>
</p>
<p>:-(<br>
</p>
<div class="moz-signature">-- <br>
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>
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