<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
</head>
<body text="#000000" bgcolor="#FFFFFF">
<div class="moz-cite-prefix">
<div class="moz-text-html" lang="x-unicode">
<div class="moz-cite-prefix">
<div class="moz-text-html" lang="x-unicode">
<div class="moz-cite-prefix">Hi everyone,</div>
<div class="moz-cite-prefix"><br>
</div>
<div class="moz-cite-prefix">Thanks John for pointing out
the new dataset!</div>
<div class="moz-cite-prefix"><br>
</div>
<div class="moz-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="moz-cite-prefix"><br>
</div>
<div class="moz-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="moz-cite-prefix"><br>
</div>
<div class="moz-cite-prefix">So, I got interested and I had
a look at the data for Montreal: <a
class="moz-txt-link-freetext"
href="https://imgur.com/a/PwuZ3Q5">https://imgur.com/a/PwuZ3Q5</a></div>
<div class="moz-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="moz-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="moz-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="moz-cite-prefix"><br>
</div>
<div class="moz-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="moz-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="replaced-blockquote"
cite="mid:CAJ-Ex1Hn5v_79WXC0H=1v1djwmxUiafZLELogsfNEyTZHeYA6A@mail.gmail.com"
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">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" target="_blank"
rel="noreferrer">jwhelan0112@gmail.com</a>>
wrote:<br>
> <br>
> <a
href="https://github.com/Microsoft/CanadianBuildingFootprints"
rel="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"
target="_blank" rel="noreferrer">Talk-ca@openstreetmap.org</a><br>
> <a
href="https://lists.openstreetmap.org/listinfo/talk-ca"
rel="noreferrer noreferrer" target="_blank">https://lists.openstreetmap.org/listinfo/talk-ca</a><br>
<br>
</blockquote>
</div>
<br>
<fieldset class="mimeAttachmentHeader"></fieldset>
<pre class="moz-quote-pre" wrap="">_______________________________________________
Talk-ca mailing list
<a class="moz-txt-link-abbreviated" href="mailto:Talk-ca@openstreetmap.org">Talk-ca@openstreetmap.org</a>
<a class="moz-txt-link-freetext" href="https://lists.openstreetmap.org/listinfo/talk-ca">https://lists.openstreetmap.org/listinfo/talk-ca</a>
</pre>
</div>
<p><br>
</p>
</div>
<br>
<br>
On 2019-03-02 17:49, James wrote:<br>
</div>
<div class="replaced-blockquote"
cite="mid:CANk4qi-Kcs0ZOaipwLQRxakLsY-==gnbTYJ77fFcbVb06=1OVA@mail.gmail.com"
type="cite">
<div dir="auto">M$ released data as ODbL sooooo pretty sure
license is compatible</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Sat., Mar. 2, 2019,
5:27 p.m. OSM Volunteer stevea, <<a
href="mailto:steveaOSM@softworkers.com">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" target="_blank"
rel="noreferrer">jwhelan0112@gmail.com</a>> wrote:<br>
> <br>
> <a
href="https://github.com/Microsoft/CanadianBuildingFootprints"
rel="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"
target="_blank" rel="noreferrer">Talk-ca@openstreetmap.org</a><br>
> <a
href="https://lists.openstreetmap.org/listinfo/talk-ca"
rel="noreferrer noreferrer" target="_blank">https://lists.openstreetmap.org/listinfo/talk-ca</a><br>
<br>
<br>
_______________________________________________<br>
Talk-ca mailing list<br>
<a href="mailto:Talk-ca@openstreetmap.org" target="_blank"
rel="noreferrer">Talk-ca@openstreetmap.org</a><br>
<a href="https://lists.openstreetmap.org/listinfo/talk-ca"
rel="noreferrer noreferrer" target="_blank">https://lists.openstreetmap.org/listinfo/talk-ca</a><br>
</blockquote>
</div>
<br>
<fieldset class="mimeAttachmentHeader"></fieldset>
<pre class="moz-quote-pre" wrap="">_______________________________________________
Talk-ca mailing list
<a class="moz-txt-link-abbreviated" href="mailto:Talk-ca@openstreetmap.org">Talk-ca@openstreetmap.org</a>
<a class="moz-txt-link-freetext" href="https://lists.openstreetmap.org/listinfo/talk-ca">https://lists.openstreetmap.org/listinfo/talk-ca</a>
</pre>
</div>
<p><br>
</p>
</div>
<br>
<br>
On 2019-03-02 17:49, James wrote:<br>
</div>
<div class="replaced-blockquote"
cite="mid:CANk4qi-Kcs0ZOaipwLQRxakLsY-==gnbTYJ77fFcbVb06=1OVA@mail.gmail.com"
type="cite">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<div dir="auto">M$ released data as ODbL sooooo pretty sure
license is compatible</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Sat., Mar. 2, 2019, 5:27
p.m. OSM Volunteer stevea, <<a
href="mailto:steveaOSM@softworkers.com"
moz-do-not-send="true">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" target="_blank"
rel="noreferrer" moz-do-not-send="true">jwhelan0112@gmail.com</a>>
wrote:<br>
> <br>
> <a
href="https://github.com/Microsoft/CanadianBuildingFootprints"
rel="noreferrer noreferrer" target="_blank"
moz-do-not-send="true">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"
target="_blank" rel="noreferrer" moz-do-not-send="true">Talk-ca@openstreetmap.org</a><br>
> <a
href="https://lists.openstreetmap.org/listinfo/talk-ca"
rel="noreferrer noreferrer" target="_blank"
moz-do-not-send="true">https://lists.openstreetmap.org/listinfo/talk-ca</a><br>
<br>
<br>
_______________________________________________<br>
Talk-ca mailing list<br>
<a href="mailto:Talk-ca@openstreetmap.org" target="_blank"
rel="noreferrer" moz-do-not-send="true">Talk-ca@openstreetmap.org</a><br>
<a href="https://lists.openstreetmap.org/listinfo/talk-ca"
rel="noreferrer noreferrer" target="_blank"
moz-do-not-send="true">https://lists.openstreetmap.org/listinfo/talk-ca</a><br>
</blockquote>
</div>
<br>
<fieldset class="mimeAttachmentHeader"></fieldset>
<pre class="moz-quote-pre" wrap="">_______________________________________________
Talk-ca mailing list
<a class="moz-txt-link-abbreviated" href="mailto:Talk-ca@openstreetmap.org">Talk-ca@openstreetmap.org</a>
<a class="moz-txt-link-freetext" href="https://lists.openstreetmap.org/listinfo/talk-ca">https://lists.openstreetmap.org/listinfo/talk-ca</a>
</pre>
</div>
<p><br>
</p>
</body>
</html>