[Imports] Fwd: [Talk-ca] [Import] Ottawa Buildings & Addresses [Statistics Canada project]

Kevin Farrugia kevinfarrugia at gmail.com
Tue Oct 25 17:31:20 UTC 2016

Hi Christoph,

Sorry, after I sent my email I noticed I wasn't in the imports mailing

Planimetrics represent whatever the ground condition was when the data was
created and updated, which is almost always done with high res
orthoimagery. If someone demolishes a shed in their backyard, the city
would likely need to notice it visually. Every place does it differently,
but that's likely what happens.

Don't think of planimetrics as what is planned, but rather map data that
isn't related to elevation. The Wikipedia definition is pretty decent:
https://en.wikipedia.org/wiki/Planimetrics#In_geography.  OSM data would be
considered planimetric.

Hope that clears it up a bit, :)


On Oct 25, 2016 9:44 AM, "James" <james2432 at gmail.com> wrote:


> ---------- Forwarded message ----------
> From:* Christoph Hormann* <chris_hormann at gmx.de>
> Date: Tue, Oct 25, 2016 at 9:38 AM
> Subject: Re: [Imports] [Talk-ca] [Import] Ottawa Buildings & Addresses
[Statistics Canada project]
> To: James <james2432 at gmail.com>
> Cc: OSM Imports List <imports at openstreetmap.org>
> On Tuesday 25 October 2016, James wrote:
> > There is also a factual basis in the example Scruss provided:
> > https://wiki.openstreetmap.org/wiki/File:12.PNG
> >
> > TD Place(Renovated/New buildings constructed in Summer 2014) is not
> > mapped in the DWG(scruss said as far back as 2011)
> > In the newer data it is:
> > https://wiki.openstreetmap.org/wiki/File:13.PNG
> The fact that a lot of buildings are missing in 12.PNG not all of which
> are probably newly built idicates that these two data sets are not
> meant to represent the same feature set, likely the one in 12.PNG is
> limited to certain types of buildings (like houses).
> On Tuesday 25 October 2016, Kevin Farrugia wrote:
> > Generally the planimetric CAD drawings (what Stewart posted) are/were
> > the source for most municipal building footprints, from what I've
> > seen in my experience.
> If i understand this correctly that would mean the data set represents
> the state of affairs as they are planned, i.e. the plans submitted by
> the land owners to obtain permission to build which do not necessarly
> match what is actually built in reality or what might have been
> demolished or modified without knowledge of the authorities.
> --
> Christoph Hormann
> http://www.imagico.de/ <http://www.imagico.de/>
> --
> 外に遊びに行こう!
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