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

[Begin Daniel]

Well, only very large buildings can be found as polygons in the Canvec product.
Furthermore, NRCan did not update the Canvec buildings layer for more than 20 years (the oldest is 1944), with only a few exceptions…

Daniel

From: James [mailto:james2432 at gmail.com]
Sent: Saturday, 22 October, 2016 10:54
To: Stewart C. Russell
Cc: Talk-CA OpenStreetMap
Subject: Re: [Talk-ca] [Imports] [Import] Ottawa Buildings & Addresses [Statistics Canada project]

http://ftp.geogratis.gc.ca/pub/nrcan_rncan/vector/canvec/shp/ManMade/
50K man made just seems to be nodes of where buildings are located, instead of outlines.
Judging by :
http://atlas.gc.ca/toporama/en/index.html
They have a few buildings in CanVEC, but not all of them. Seems like massive buildings like schools and malls, residential buildings are out.

On Sat, Oct 22, 2016 at 10:00 AM, Stewart C. Russell <scruss at gmail.com<mailto:scruss at gmail.com>> wrote:
On 2016-10-21 11:41 PM, James wrote:
> Sounds like it, but the data handed to us didnt have sidewalks and
> roads, driveways etc. Ottawa may have exported data from this file

Yes, for sure.

I've now had more of a chance to look at the data (thanks, Ottawa, for
providing no docs at all ...). I'm pretty sure that the data at
http://data.ottawa.ca/dataset/cad-topographic-data is the source of what
the Ottawa group were given.

In the 31 gigabytes of converted files, about 8-10 of the 177 total
layers might be of interest. But:

* The files are in some kind of MTM projection, but I don't know the
datum. Some munis still love their NAD27, so getting this right is crucial.

* These were digitized 2010-2011 at the latest. Since municipalities
share data with NRCan, aren't these outlines already available in a
recent iteration of CanVec in a much more useful (i.e., anything but
DWG) format?

My notes on the files, so far:
https://gist.github.com/scruss/e7f85da2e7943cb1a1d13772fbe144d3#file-ottawabfomapdata-md

(feel free to use/modify/etc)

If anyone wants 31 GB of converted DXFs, let me know. It took Teigha
several hours on a quad core with SSDs to convert this, so I'm not going
to delete it lightly.

cheers,
 Stewart


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