[Talk-ca] Building Import

[John Whelan]

Bonne chance

John

Begin Daniel wrote on 2019-03-19 2:14 PM:
>
> I expect Pierre, Tim and others to send me any data they believe would 
> be problematic. If I send them my own test dataset, it may not cover 
> the cases they are interested in. J
>
> Daniel
>
> *From:*john whelan [mailto:jwhelan0112 at gmail.com]
> *Sent:* Tuesday, March 19, 2019 13:32
> *To:* Begin Daniel
> *Cc:* talk-ca at openstreetmap.org
> *Subject:* Re: [Talk-ca] Building Import
>
> It would make logical sense to preprocess all the data but then you 
> end up with two sources.  The Open Data original and the preprocessed 
> data source.
>
> From a logical point of view it would make sense to use the Microsoft 
> data to fill in the gaps.  So add it into the preprocessed data.
>
> Then you get to reality.  To make it work across Canada you need to 
> get agreement and that I think will be the most difficult part.
>
> Step one I think is ask Pierre nicely to review a sample and see if it 
> meets his "quality" expectations.
>
> Step two would be check with Tim in Montreal for his thoughts.
>
> If they are both in agreement that it is acceptable then we see if we 
> can get some sort of acceptance across the country possibly blacking 
> out certain areas.
>
> If we can we'll need to go back to the import mailing list and say we 
> wish to combine two sources and amend the plan accordingly.
>
> Otherwise it is up to whoever sorts out an import plan / import for a 
> particular area to consider its use.
>
> Cheerio John
>
> On Tue, 19 Mar 2019 at 12:59, Begin Daniel <jfd553 at hotmail.com 
> <mailto:jfd553 at hotmail.com>> wrote:
>
>     Hi all,
>
>     As mentioned a few weeks ago, I have almost completed the
>     development of a clean-up tool for the data to be imported.
>
>     So far, it removes nonessential vertices, orthogonalizes building
>     corners when reasonable and ensures walls’ alignment within given
>     tolerances. Building footprints that can’t be processed completely
>     are flagged accordingly, so they could be examined thoroughly at
>     import time.
>
>     Eventually, It should be easy to remove overlapping buildings
>     (potentially generated from a 3d mapping), but I doubt that
>     splitting terrace into individual buildings can be done
>     automatically.
>
>     The tool uses some parameters that need to be adjusted. I would
>     like that those who are interested in this aspect of the import
>     send me benchmark data that could be problematic. I will process
>     them to adjust parameters and/or the tool, and I will send back
>     the results to the sender for a thorough examination.
>
>     I should soon document the process in the “Canada Building Import”
>     wiki page (in a pre-processing section).
>
>     Thought? Comments?
>
>     Daniel
>
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