I think my concerns are to do with the "black box" approach. Knowing
your background I trust your work but others might not.
On a technical side I get the impression that cites with buildings that
are close to each other are problematical. I assume that small
locations with a population of say under 125,000 this is an
insignificant problem?
The other issue is I'd like to either see buy in from Nate or at least
some Toronto mappers to get an indication that something will happen at
the end of the day as it is a fair chunk of Daniel's time to work out
how do the preprocessing.
I think some BC mappers expressed some doubts as well so perhaps they
would like to think about if they are happy or would prefer BC to be
outside of the import project and express their views.
Out of interest if it does move ahead are we including the Microsoft
data for areas where we do not have data from Stats Canada? If so we
will need to amend the project plan.
My personal view is realistically I think having building information
even if its a meter or two out is better than not having the building
outlines.
What would be nice is if we could have some indication from places such
as Manitoba, Alberta, Saskatchewan, Quebec excluding Montreal, Ontario
excluding Toronto and the other provinces and territories whether they
are happy with importing the buildings either from Stats or Microsoft.
I seem to recall Keith is in Manitoba, so any views other than it wasn't
present in the first release from Stats?
Note to Alessandro this is just background stuff.
Thanks
Cheerio John
Begin Daniel wrote on 2019-03-26 3:29 PM:
Jarek,
The area you proposed in quite interesting and will force me to look further at
buildings with sharing edges, a concern Pierre also had. I'll be back soon with
your area processed.
Daniel
-----Original Message-----
From: Begin Daniel [mailto:jfd...@hotmail.com]
Sent: Tuesday, March 26, 2019 14:34
To: Jarek Piórkowski; talk-ca@openstreetmap.org
Subject: Re: [Talk-ca] Building Import
Jarek,
Since it is a one-time process, I expect to be able to process the files if the
community feels comfortable with it. In the meantime, people are welcome to
send me the bounding box of an area they would like to examine.
Daniel
-----Original Message-----
From: Jarek Piórkowski [mailto:ja...@piorkowski.ca]
Sent: Tuesday, March 26, 2019 13:46
To: Begin Daniel; talk-ca@openstreetmap.org
Subject: Re: [Talk-ca] Building Import
On Tue, 26 Mar 2019 at 13:10, Begin Daniel <jfd...@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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