<div dir="auto">Please read Tim's comments below I suspect he meant to cc talk-ca.<div dir="auto"><br></div><div dir="auto">My thoughts run along the same lines as Tim's basically local groups have to look at what is available then decide for themselves how they wish to proceed.</div><div dir="auto"><br></div><div dir="auto">We have some experience in the import process available but I think it needs to be driven by local mappers since they are the authority.</div><div dir="auto"><br></div><div dir="auto">Cheerio John</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sat, Mar 2, 2019, 7:45 PM Tim Elrick, <<a href="mailto:tim@elrick.de">tim@elrick.de</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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<div class="m_8902928588064565796moz-cite-prefix">Hi everyone,</div>
<div class="m_8902928588064565796moz-cite-prefix"><br>
</div>
<div class="m_8902928588064565796moz-cite-prefix">Thanks John for pointing out the new
dataset!</div>
<div class="m_8902928588064565796moz-cite-prefix"><br>
</div>
<div class="m_8902928588064565796moz-cite-prefix">Steve, John just indicated that there
is this new dataset available now. I am confident, that after our
discussion on importing building footprints in Canada, the
OSMappers who want to go forward with it, will provide the
information on the import plan/wiki.</div>
<div class="m_8902928588064565796moz-cite-prefix"><br>
</div>
<div class="m_8902928588064565796moz-cite-prefix">You can download the Microsoft file at
the site indicated by John. The license information can be found
there as well (as mentioned by James it is ODbL. It is much more
extensive than the Open Building Database release by StatCan (>
12 million buildings vs. 4.4 million buildings).<br>
</div>
<div class="m_8902928588064565796moz-cite-prefix"><br>
</div>
<div class="m_8902928588064565796moz-cite-prefix">So, I got interested and I had a look
at the data for Montreal: <a class="m_8902928588064565796moz-txt-link-freetext" href="https://imgur.com/a/PwuZ3Q5" target="_blank" rel="noreferrer">https://imgur.com/a/PwuZ3Q5</a></div>
<div class="m_8902928588064565796moz-cite-prefix">I chose an area where OSM data existed.
As you can see OSM hand-drawn buildings from Bing imagery are
nicely drawn and separated. <br>
</div>
<div class="m_8902928588064565796moz-cite-prefix">When you compare the OSM data to the
Open Building Database (OBD) data from StatCan (brown in my
images) which draws on the données ouvertes de Ville de Montréal
(extracted from photogrammetric imagery) you can see that the OBD
data is somehow more precise than the OSM/Bing data, but the huge
draw back is that the OBD data only captures the building outlines
of attached/terraced buildings, i.e. of building blocks without
separating single buildings (as already mentioned by me in a
separated e-mail to the list - this is why we will have to do some
pre-processing of the data).</div>
<div class="m_8902928588064565796moz-cite-prefix">When you then compare this data set to
the Microsoft data set (pink in my images), you see that their
deep neural network approach fails in areas with terraced houses
big time. Same goes for the the city centre of Montreal (not shown
in my images).<br>
</div>
<div class="m_8902928588064565796moz-cite-prefix"><br>
</div>
<div class="m_8902928588064565796moz-cite-prefix">So, the Microsoft data set might work
for areas with single homes and that would be helpful to fill in
the blanks in remote areas, but for areas where we have data from
the ODB, importing from the ODB might be better. However, caution
has to be taken with ODB as well, as every municipality that
contributed data might have contributed a different data source,
where the quality should be check each time. <br>
</div>
<div class="m_8902928588064565796moz-cite-prefix"><br>
</div>
<p>Just my two cents here.</p>
<p>Tim<br>
</p>
<p><br>
</p>
<p>On 2019-03-02 17:40, john whelan wrote:</p>
<div class="m_8902928588064565796replaced-blockquote" type="cite">
<div dir="auto">Why are you planning to import it?
<div dir="auto"><br>
</div>
<div dir="auto">Cheerio John</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Sat, Mar 2, 2019, 5:26 PM
OSM Volunteer stevea, <<a href="mailto:steveaOSM@softworkers.com" target="_blank" rel="noreferrer">steveaOSM@softworkers.com</a>>
wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">A
responsible complement to this would be a link to license
information, a wiki page about these data, and perhaps an
Import Plan should those data actually be asserted to be
worthy of being responsibly imported into OSM.<br>
<br>
SteveA<br>
California<br>
<br>
> On Mar 2, 2019, at 2:17 PM, john whelan <<a href="mailto:jwhelan0112@gmail.com" rel="noreferrer noreferrer" target="_blank">jwhelan0112@gmail.com</a>>
wrote:<br>
> <br>
> <a href="https://github.com/Microsoft/CanadianBuildingFootprints" rel="noreferrer noreferrer noreferrer" target="_blank">https://github.com/Microsoft/CanadianBuildingFootprints</a><br>
> <br>
> So now there are two Open Data sources for building
outlines in Canada.<br>
> <br>
> Cheerio John<br>
> _______________________________________________<br>
> Talk-ca mailing list<br>
> <a href="mailto:Talk-ca@openstreetmap.org" rel="noreferrer noreferrer" target="_blank">Talk-ca@openstreetmap.org</a><br>
> <a href="https://lists.openstreetmap.org/listinfo/talk-ca" rel="noreferrer noreferrer noreferrer" target="_blank">https://lists.openstreetmap.org/listinfo/talk-ca</a><br>
<br>
</blockquote>
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<pre class="m_8902928588064565796moz-quote-pre">_______________________________________________
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</pre>
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