[Talk-ca] Building Import

[Nate Wessel]

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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