On Thu, Oct 29, 2009 at 12:53:45PM -0400, Adam Glauser wrote: > John Whelan wrote: > > Basically the map in Ottawa is unreliable but we don't know where. > > There seems to be no way of knowing whether a road has been mapped by > > GPS trace or sketched in by hand. > > If I understand the process correctly, to do an import from Geobase you > would need to use a script > (http://wiki.openstreetmap.org/wiki/Geobase2osm) to convert the files > from Geobase to .osm files.
Although the conversion from geobase is a lot of work, it's already been done! See https://spreadsheets.google.com/ccc?key=0Am70fsptsPF2dG1ZN1YwMmZCVDhDOHZpbUNmOGlvWGc&hl=en&pli=1 In particular, the area http://www.easy-share.com/1905429944/031G45.may29.osm.gz covers Ottawa. What I recommend when updating Openstreetmap is to use josm and download the relevant openstreetmap data and gps traces (you already uploaded your personal traces to openstreetmap, right?). Next, load your local copy of the relevant geobase data. Then use your judgement plus local knowledge as to how streets should be mapped. One thing that seems to initially surprise people who have not used GPS much is how bad a lot of GPS traces are. A good, modern GPS is amazing when the skies are clear. However, use an old gps or add trees or cloudy skies and you can suddenly find the traces weaving more than a drunk driver. *** BTW, if possible set your GPS to record at 1s intervals. *** Until perfectly aligned, free, hi-resolution satellite imagery comes along, every tool we have is flawed. Even then, satellite images can't see through trees or clouds. -- James Treacy tre...@debian.org _______________________________________________ Talk-ca mailing list Talk-ca@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-ca
