[Talk-ca] FW: Building Import

[John Whelan]

I like the idea of building a consensus on a building import.

More seriously if we can get any sort of consensus I'll be more than happy.

Cheerio John

Begin Daniel wrote on 2019-03-21 2:40 PM:
>
> Oupsssss, I still miss the “reply all” button
>
> *From:*jfd553 at hotmail.com
> *Sent:* Thursday, March 21, 2019 14:36
> *To:* 'Nate Wessel'
> *Subject:* RE: [Talk-ca] Building Import
>
> Hi all,
>
> Concerning the pre-processing, let’s try/check first the 
> “orthogonalization” component then, if there is a consensus on the 
> validity of the result, we can build on it J
>
> Daniel
>
> *From:*Nate Wessel [mailto:bike756 at gmail.com]
> *Sent:* Thursday, March 21, 2019 14:30
> *To:* John Whelan
> *Cc:* talk-ca at openstreetmap.org
> *Subject:* Re: [Talk-ca] Building Import
>
> I've specifically and repeatedly requested that the tasking manager be 
> taken down while this project is reworked... though that doesn't 
> pertain directly to the email I just sent.
>
> Nate Wessel
> Jack of all trades, Master of Geography, PhD candidate in Urban Planning
> NateWessel.com <http://natewessel.com>
>
> On 3/21/19 2:02 PM, John Whelan wrote:
>
>     Nate are you requesting something specific on the Canadian task
>     manager for Toronto at this time or would you prefer to look
>     through Daniel's work first?
>
>     Thanks
>
>     Cheerio John
>
>     Nate Wessel wrote on 2019-03-21 1:49 PM:
>
>     Daniel,
>
>     This is exciting news! After much talk on this list, it seems we
>     may have some actual progress toward fixing the various data
>     quality issues. Would you mind sharing some of your code, or a
>     description of your workflow here or on GitHub or the like so we
>     can take a look?
>
>     One thing you didn't mention which I think will be really
>     critical, especially in central Toronto: We need to remove
>     buildings from the import dataset that may already be mapped in
>     OSM. That is, buildings that overlap with existing buildings. For
>     this import to make any sense in Central Toronto, we need
>     conflation to move slowly, and in smaller, more manageable steps.
>     Buildings that are already mapped should be checked manually at a
>     later time in batches that a skilled human can manage in less than
>     an hour. The tasking manager as it's currently set up would have
>     all of downtown conflated by hand in one task by a single mapper -
>     a recipe for disaster I'm sure, given how detailed the map is in
>     that area.
>
>     Cheers,
>
>     Nate Wessel
>     Jack of all trades, Master of Geography, PhD candidate in Urban
>     Planning
>     NateWessel.com <http://natewessel.com>
>
>     On 3/19/19 12:58 PM, Begin Daniel 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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