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I agree with Frederik.</div>
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I have mixed-feelings with my experience with this dataset. I used them once, through RapiD, and it was good to improve mapping (much faster selecting yes/no than drawing a polygon). However, I would say that roughly 30% of the suggested buildings were in very
poor quality (inexistent or weird shape). In rural areas or condensed urban areas it was even poorer.</div>
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Therefore, I am also skeptical about doing some kind of import of this data. However, using them through RapiD or MapRoulette, doing it building by building, seems good to me.</div>
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Martijn van Exel also created a nice and easy tutorial on creating a MapRoulette challenge with this dataset: <a href="https://www.openstreetmap.org/user/mvexel/diary/399229" id="LPNoLPOWALinkPreview">https://www.openstreetmap.org/user/mvexel/diary/399229</a></div>
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Best,</div>
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Matheus</div>
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(matheusgomesms)</div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>De:</b> Frederik Ramm <frederik@remote.org><br>
<b>Enviado:</b> terça-feira, 24 de maio de 2022 09:19<br>
<b>Para:</b> imports@openstreetmap.org <imports@openstreetmap.org><br>
<b>Assunto:</b> Re: [Imports] [buildings] Italy</font>
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<div class="PlainText">Hi,<br>
<br>
On 23.05.22 10:06, Cascafico Giovanni wrote:<br>
> I'd like to import building footprints recently published by Microsoft.<br>
> Here [1] is an import wiki draft.<br>
<br>
I am skeptical. The data is known to be of very mixed quality and does <br>
need manual inspection. You will not be able to do this alone, you need <br>
dozens of volunteers - ideally with local knowledge - to help. Does this <br>
project have wide support in the Italian OSM community or is it a <br>
one-man-show?<br>
<br>
Also you will want to ensure not only that imported buildings don't <br>
overlap other buildings - they should not overlap with roads, rivers or <br>
other features either, and if they do the situation needs to be manually <br>
checked - are the features in OSM wrong, is the building wrong, or is <br>
this really a building with a road underneath, etc.<br>
<br>
I am also concerned that - compared to manual tracing - this will add <br>
(old) buildings and nothing else, whereas someone manually tracing an <br>
area would usually result in a richer set of features (and someone <br>
familiar with the area doing it, even better data).<br>
<br>
Italy has many very old towns with lots of non-rectangular buildings <br>
placed wall-by-wall, intermixed mit sheds and all - even for a human <br>
being it can often be hard to discern individual buildings on the <br>
imagery. Have you checked if the data you want to import is good enough <br>
in these areas - or will someone visiting the area and wanting to map <br>
individual house numbers have to delete and re-draw everything?<br>
<br>
Bye<br>
Frederik<br>
<br>
-- <br>
Frederik Ramm ## eMail frederik@remote.org ## N49°00'09" E008°23'33"<br>
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