[Talk-ca] FW: Building Import
John Whelan
jwhelan0112 at gmail.com
Thu Mar 21 18:45:07 UTC 2019
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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