[Talk-ca] Microsoft has released its building outlines for Canada

Sun Mar 3 00:57:34 UTC 2019

Hi everyone,

Thanks John for pointing out the new dataset!

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.

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).

So, I got interested and I had a look at the data for Montreal: 
https://imgur.com/a/PwuZ3Q5
I chose an area where OSM data existed. As you can see OSM hand-drawn 
buildings from Bing imagery are nicely drawn and separated.
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).
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).

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.

Just my two cents here.

Tim

On 2019-03-02 17:40, john whelan wrote:

Why are you planning to import it?

Cheerio John

On Sat, Mar 2, 2019, 5:26 PM OSM Volunteer stevea, 
<steveaOSM at softworkers.com <mailto:steveaOSM at softworkers.com>> wrote:

    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.

    SteveA
    California

     > On Mar 2, 2019, at 2:17 PM, john whelan <jwhelan0112 at gmail.com
    <mailto:jwhelan0112 at gmail.com>> wrote:
     >
     > https://github.com/Microsoft/CanadianBuildingFootprints
     >
     > So now there are two Open Data sources for building outlines in
    Canada.
     >
     > Cheerio John
     > _______________________________________________
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     > Talk-ca at openstreetmap.org <mailto:Talk-ca at openstreetmap.org>
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On 2019-03-02 17:49, James wrote:
M$ released data as ODbL sooooo pretty sure license is compatible

On Sat., Mar. 2, 2019, 5:27 p.m. OSM Volunteer stevea, 
<steveaOSM at softworkers.com <mailto:steveaOSM at softworkers.com>> wrote:

    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.

    SteveA
    California

     > On Mar 2, 2019, at 2:17 PM, john whelan <jwhelan0112 at gmail.com
    <mailto:jwhelan0112 at gmail.com>> wrote:
     >
     > https://github.com/Microsoft/CanadianBuildingFootprints
     >
     > So now there are two Open Data sources for building outlines in
    Canada.
     >
     > Cheerio John
     > _______________________________________________
     > Talk-ca mailing list
     > Talk-ca at openstreetmap.org <mailto:Talk-ca at openstreetmap.org>
     > https://lists.openstreetmap.org/listinfo/talk-ca

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On 2019-03-02 17:49, James wrote:
M$ released data as ODbL sooooo pretty sure license is compatible

On Sat., Mar. 2, 2019, 5:27 p.m. OSM Volunteer stevea, 
<steveaOSM at softworkers.com <mailto:steveaOSM at softworkers.com>> wrote:

    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.

    SteveA
    California

     > On Mar 2, 2019, at 2:17 PM, john whelan <jwhelan0112 at gmail.com
    <mailto:jwhelan0112 at gmail.com>> wrote:
     >
     > https://github.com/Microsoft/CanadianBuildingFootprints
     >
     > So now there are two Open Data sources for building outlines in
    Canada.
     >
     > Cheerio John
     > _______________________________________________
     > Talk-ca mailing list
     > Talk-ca at openstreetmap.org <mailto:Talk-ca at openstreetmap.org>
     > https://lists.openstreetmap.org/listinfo/talk-ca

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