[Talk-ca] Building Import

[John Whelan]

We have a history of using CANVEC data and importing that.  Daniel was 
very closely connected to the data.  In Ontario the ESRI tools are used 
in schools but they can be used with openstreetmap as the base map.   
 From a practical point of view developing a set of tools or process in 
the open data world would allow others outside Canada to use them 
however Daniel knows his tools very well.

Cheerio John

Tim Elrick wrote on 2019-03-26 9:33 PM:
> I sent Daniel a sample of Montreal (Outrement) from the Open Building 
> Database and Daniel's algorithm performed really well. It could reduce 
> the vertices count by 13% without loosing or even improving data 
> quality (as it orthogonalized the buildings). Even difficult buildings 
> were treated well [1].
>
> As OSM is mainly built on open source tools, the OSMF tries to work 
> with open source tools only and the process should be reproducible (if 
> not for this import, then for the next one somewhere else in the OSM 
> cosmos), I suggest, we try to resemble Daniel's pre-processing in open 
> source software, e.g. PostGreSQL/PostGIS. I already found the code for 
> collinearity; the orthogonalization seems to be a bit trickier, but it 
> should be possible to built the process in PostGIS as well, if it was 
> possible to built it in FME. What do you think?
>
> Tim
>
> [1] https://imgur.com/a/aCKMVb7
>
> On 2019-03-26 13:45, Jarek Piórkowski wrote:
> On Tue, 26 Mar 2019 at 13:10, Begin Daniel <jfd553 at hotmail.com> wrote:
>> There is actually no standard “code” available since I use FME 
>> (www.safe.com). It is a proprietary ETL application and all 
>> operations are done using “transformers” 
>> (https://www.safe.com/transformers/). I can provide you with the 
>> workbench I developed (a bunch of linked transformers) but you need a 
>> license to run it. This is why I tried to describe the operations I 
>> run on the data in the wiki.
>>
>> As you did, people may send me coordinates (bounding box) of an area 
>> they know well. I’ll process the area and send the results back in 
>> OSM format. Please, be reasonable on the amount of data to process ;-)
>
> Thanks Daniel. Let me know how it looks then!
>
> Coming from an open-source background, the process is unusual to me,
> and I have questions about scalability - will you be able to process
> and provide updated data files for all of Canada then? - but if others
> are comfortable with it then I won't object.
>
> Some general thoughts regarding tooling as raised upthread:
>
> I was initially excited to see building footprints data as they help
> two quite distinct purposes:
>
> 1. they provide a mostly-automatic source of geometries for the
> millions of single-family houses that wouldn't be mapped in the next
> decade otherwise
>
> 2. they might provide a corrected and fairly accurate source of
> geometries in heavily-built-up areas, where GPS signal is not that
> reliable and it can be really difficult to get sufficiently accurate
> geometries from imagery, whether because it's not sufficiently
> high-resolution, two sets of imagery with conflicting offsets (Bing
> and Esri are the two best sets in Toronto, and they're off by about
> 1-2 m on north-south axis from each other - that's not something I can
> check with a consumer-grade GPS so I'm left guessing as to which is
> true), or non-vertical imagery (I can count the floors on supposedly
> top-down imagery in some cases).
>
>  From what I saw, imports in the GTHA initially focused on the first
> case, and I think the Tasking Manager setup was mostly sufficient for
> those - where there is nothing currently on the map, or a few simple
> 2D geometries, a 4 sq km area can feasibly be done in under an hour.
>
> However, as raised by others, I would really want the working squares
> in Old Toronto for example to be no more than 500 m x 500 m, or no
> more than 1 km x 1 km in St. Catharines. I would _love_ to have the
> geometries to manually compare and adjust the 3D buildings already
> existing in the area, but it will be much slower.
>
> --Jarek
>
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