I've updated the documentation and incorporated Scruss's findings on the build source data: https://wiki.openstreetmap.org/wiki/Canada:Ontario:Ottawa/Import/TopographicMap
On Sat, Oct 22, 2016 at 5:58 PM, Begin Daniel <[email protected]> wrote: > 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:[email protected]] > *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 <[email protected]> > 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/e7f85da2e7943cb1a1d13772fbe144 > d3#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 > > > > _______________________________________________ > Talk-ca mailing list > [email protected] > https://lists.openstreetmap.org/listinfo/talk-ca > > > > > -- > > 外に遊びに行こう！ > -- 外に遊びに行こう！
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