[Imports] [buildings] Italy

[Matheus Gomes]

I agree with Frederik.

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.

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.

Martijn van Exel also created a nice and easy tutorial on creating a MapRoulette challenge with this dataset: https://www.openstreetmap.org/user/mvexel/diary/399229

Best,
Matheus
(matheusgomesms)
________________________________
De: Frederik Ramm <frederik at remote.org>
Enviado: terça-feira, 24 de maio de 2022 09:19
Para: imports at openstreetmap.org <imports at openstreetmap.org>
Assunto: Re: [Imports] [buildings] Italy

Hi,

On 23.05.22 10:06, Cascafico Giovanni wrote:
> I'd like to import building footprints recently published by Microsoft.
> Here [1] is an import wiki draft.

I am skeptical. The data is known to be of very mixed quality and does
need manual inspection. You will not be able to do this alone, you need
dozens of volunteers - ideally with local knowledge - to help. Does this
project have wide support in the Italian OSM community or is it a
one-man-show?

Also you will want to ensure not only that imported buildings don't
overlap other buildings - they should not overlap with roads, rivers or
other features either, and if they do the situation needs to be manually
checked - are the features in OSM wrong, is the building wrong, or is
this really a building with a road underneath, etc.

I am also concerned that - compared to manual tracing - this will add
(old) buildings and nothing else, whereas someone manually tracing an
area would usually result in a richer set of features (and someone
familiar with the area doing it, even better data).

Italy has many very old towns with lots of non-rectangular buildings
placed wall-by-wall, intermixed mit sheds and all - even for a human
being it can often be hard to discern individual buildings on the
imagery. Have you checked if the data you want to import is good enough
in these areas - or will someone visiting the area and wanting to map
individual house numbers have to delete and re-draw everything?

Bye
Frederik

--
Frederik Ramm  ##  eMail frederik at remote.org  ##  N49°00'09" E008°23'33"

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