[Imports] Import building footprints Lopa & Lingo

Wed Jul 22 10:39:06 UTC 2020

Thanks Claire, I’ll try to get that done.
Best, Jorieke

From: Claire Halleux <claire.halleux at hotosm.org>
Sent: 22 July 2020 11:33
To: Mateusz Konieczny <matkoniecz at tutanota.com>
Cc: Jorieke Vyncke <jorieke.vyncke at london.msf.org>; imports at openstreetmap.org
Subject: Re: [Imports] Import building footprints Lopa & Lingo

Hi Jorieke,

Would the situation change if myself and the few volunteers working on uploading the data could have access to the initial imagery? I think that might be maybe possible…  Of course if there are experienced mappers here who would like to help out with the import, please let me know, you’re always welcome to join the effort!
Yes, it would help a lot to better trust the data if at least you or a few contributors could visualize the initial imagery.
I had previously identified a few places which seemed more or less suspicious in my point of view, happy to share them with you if you can request some kind of (even limited) access to the imagery.

Claire

From: Mateusz Konieczny via Imports <imports at openstreetmap.org<mailto:imports at openstreetmap.org>>
Sent: 21 July 2020 13:04
Cc: imports at openstreetmap.org<mailto:imports at openstreetmap.org>
Subject: Re: [Imports] Import building footprints Lopa & Lingo

As I understand, the plan is to load the buildings in manageable sets from the tasking manager,

and person doing verification will skip solely clearly bizarre geometries and assume that everything

else is correct.

I think that given presence of nonsense geometries means that seemingly OK ones cannot

be assumed to be valid ones, and only verified ones should be imported.

Jul 21, 2020, 11:53 by winfixit at gmail.com<mailto:winfixit at gmail.com>:

I get the impression Mateusz thinks the import will consist of an automatic dump of the data, whereas the actual plan is to load the buildings in manageable sets from the tasking manager and then a person does the verification, maybe by using the todo plugin in JOSM?

Polyglot

On Tue, Jul 21, 2020 at 10:25 AM Jorieke Vyncke <jorieke.vyncke at london.msf.org<mailto:jorieke.vyncke at london.msf.org>> wrote:

Hi Mateusz,

Thanks for your feedback!

There are really not that many of this type of buildings in the dataset, most of the buildings are nicely squared or circulized. By the manual verification of the data, we’ll of course compare and adapt the building data with the latest imagery that we have available on OpenStreetMap – the Maxar Premium Imagery. We’ll correct with help of that imagery and of course in all cases nicely square corners of the weird shapes. There will really not be a ‘soul-crushing cleanup’ needed after this import.

Would you rather propose to leave these buildings out? We could do that as well, but I would prefer not to, since this means we will have an incomplete dataset in the area. I’d rather choose for correcting the shapes with help of available imagery.

Best wishes,

Jorieke

From: Mateusz Konieczny via Imports <imports at openstreetmap.org<mailto:imports at openstreetmap.org>>
Sent: 20 July 2020 18:20
Cc: 'imports at openstreetmap.org<mailto:imports at openstreetmap.org>' <imports at openstreetmap.org<mailto:imports at openstreetmap.org>>
Subject: Re: [Imports] Import building footprints Lopa & Lingo

Jul 20, 2020, 18:18 by jorieke.vyncke at london.msf.org<mailto:jorieke.vyncke at london.msf.org>:

Q: Some buildings have strange trapezoidal shapes, how are you planning to correct them without accessing the imagery?

There are not that many of these. Since we are not able to check back with the original imagery, we’ll have to trust the dataset we want to import for this and will upload the data. Of course by looking at the data manually we would be able to spot areas with real issues with this and then we can still decide to not upload that data.

So clearly suspicious shapes such as this trapeizodal ones will be skipped and

everything else without blatant mistakes will be imported without verification?

That seems to be a bad idea and I am opposed to such import. It will just burden

any community of mappers that may appear with soul-crushing cleanup.

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