Re: [Talk-ca] Aylmer/Hull QC: CanVec import overwriting existing edits
On Sat, Feb 19, 2011 at 3:27 PM, Jonathan Crowe wrote: > This is rather discouraging and frustrating. Please contact the other user(s) who are importing and ask them to join this conversation. Best regards, Richard ___ Talk-ca mailing list Talk-ca@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-ca
Re: [Talk-ca] Aylmer/Hull QC: CanVec import overwriting existing edits
This is exactly why it's important to get more local people importing Canvec. If we can get people some experience by playing around in a sandbox (ie. they get to try out connecting intersections, editing relations, etc, without saving), and when they have some editing practice, then let them import Canvec for their local area, we will see less of these types of problems. When four or five people are trying to import all of Canada, that's where problems arise. Sometimes when trying to import an area we are not familiar with, we try to guess which source of data is more accurate, and we guess wrong. I've seen cases in BC where somebody has made many edits that are *obviously* wrong, and after a while I start to assume that *any* edit by that person is of low quality. Canvec is generally very good, so sometimes it's easy to think that it's the most up-to-date. This doesn't excuse deleting traffic lights or changing street classification, but could be a fair assumption when Bing shows a road under construction and Canvec has it completed. Bing imagery for Chilliwack has an empty field where Mr. Mikes restaurant has been standing for five or six years (the Bing imagery was actually taken in 2003), while Canvec has a new road that was built two summers ago. And this is a city of ~60k people in the Fraser Valley near the US border, so we usually have up-to-date aerial imagery. It's difficult to guess the accuracy of pre-existing data, or what source was used, and how old the source was at the time (GPS? Yahoo? Bing? Landsat? Yes I've seen highway traces done from Landsat). You can check how old Bing imagery is for any area using [http://mvexel.dev.openstreetmap.org/bing/] Aylmer was photographed in the summer of 2006. I once calculated that if one person were to do one Canvec subtile (092H04.0.0) per day (about half an hour of work per day, depending on pre-existing data), it would take ~360 years to complete the Canvec import. Don't wait for someone else to import: get your friends involved and have a mapping/import party for your local area! Adam On Sat, Feb 19, 2011 at 12:27 PM, Jonathan Crowe wrote: > This is rather discouraging and frustrating. > > When the Bing imagery was made available, I spent a fair amount of > time cleaning up the maps in Aylmer, Quebec, a western suburb of > Gatineau. Just discovered that my edits have been overwritten by > another user importing CanVec data. > > This import has introduced hundreds of errors: > > - Proposed and under-construction streets are shown as completed. > - Streets are tagged as unclassified. > - Service roads have been removed altogether. > - Turning circles and traffic signals are missing. > - Certain streets do not line up with high-resolution Bing imagery, > and not in an off-by-a-few-metres way -- for example, the Bing image > has a subtle S-curve, the CanVec data has a rather crude straight line > bisecting the curve. > > This means that Aylmer now needs dozens of person-hours to get it back > to where it was -- and at this point I'm discouraged enough to say the > hell with this project and find something better to do with my spare > time. > > Much of Ottawa is in a similar state: manual edits superimposed with > CanVec imports that may or may not have been more accurate, and now > there are two or three duplicates on top of one another. It's a mess, > and it's in no way ready for MapQuest. > > I thought CanVec imports were frowned upon when there was existing road data? > > I'll tell you this: this is not the way to encourage people to > contribute, if all the work we do with imagery is subject to > obliteration by someone else's work with government vector data. > > Yours in frustration, > > Jonathan Crowe > The Map Room: A Weblog About Maps > http://www.maproomblog.com/ > > ___ > Talk-ca mailing list > Talk-ca@openstreetmap.org > http://lists.openstreetmap.org/listinfo/talk-ca > ___ Talk-ca mailing list Talk-ca@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-ca
Re: [Talk-ca] [Talk-ca ] requests for import of Satscan Data
Tyler,The street name for Manitoba will be part of the next release of CanVec this spring (in June). The street names are from StatsCan. The data is already available in GeoBase. For SK, it might be ready for this fall release.François- Message d'origine De: "Tyler Gunn" A: Samuel Dyck Copies: talk-ca@openstreetmap.orgObjet: Re: [Talk-ca ] requests for import of Satscan DataDate: 19/02/11 11:12On 2011-02-13, at 8:37 PM, Samuel Dyck wrote: > Hi > > I've been importing Canvec 7 data for northern Manitoba, and the tile that includes Flin Flon, MB also contains Creighton, SK. Since Canvec 7 lack street names for Saskatchewan, could someone who (unlike myself) knows what they're doing please import the StatsCan street names for Creighton? > > Thanks > > Sam Dyck (the one who is neither Sam Vekemans nor Samuel Longiaru) > Hi Sam, I've got the province of Saskatchewan converted already. I'll send it to you in a followup email. Thanks, Tyler -- Tyler Gunn ty...@egunn.com http://www.egunn.com/ ___ Talk-ca mailing list Talk-ca@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-ca __ Message envoyé par secure.coopmail.coop ___ Talk-ca mailing list Talk-ca@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-ca
[Talk-ca] Aylmer/Hull QC: CanVec import overwriting existing edits
This is rather discouraging and frustrating. When the Bing imagery was made available, I spent a fair amount of time cleaning up the maps in Aylmer, Quebec, a western suburb of Gatineau. Just discovered that my edits have been overwritten by another user importing CanVec data. This import has introduced hundreds of errors: - Proposed and under-construction streets are shown as completed. - Streets are tagged as unclassified. - Service roads have been removed altogether. - Turning circles and traffic signals are missing. - Certain streets do not line up with high-resolution Bing imagery, and not in an off-by-a-few-metres way -- for example, the Bing image has a subtle S-curve, the CanVec data has a rather crude straight line bisecting the curve. This means that Aylmer now needs dozens of person-hours to get it back to where it was -- and at this point I'm discouraged enough to say the hell with this project and find something better to do with my spare time. Much of Ottawa is in a similar state: manual edits superimposed with CanVec imports that may or may not have been more accurate, and now there are two or three duplicates on top of one another. It's a mess, and it's in no way ready for MapQuest. I thought CanVec imports were frowned upon when there was existing road data? I'll tell you this: this is not the way to encourage people to contribute, if all the work we do with imagery is subject to obliteration by someone else's work with government vector data. Yours in frustration, Jonathan Crowe The Map Room: A Weblog About Maps http://www.maproomblog.com/ ___ Talk-ca mailing list Talk-ca@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-ca
Re: [Talk-ca] requests for import of Satscan Data
On 2011-02-13, at 8:37 PM, Samuel Dyck wrote: > Hi > > I've been importing Canvec 7 data for northern Manitoba, and the tile that > includes Flin Flon, MB also contains Creighton, SK. Since Canvec 7 lack > street names for Saskatchewan, could someone who (unlike myself) knows what > they're doing please import the StatsCan street names for Creighton? > > Thanks > > Sam Dyck (the one who is neither Sam Vekemans nor Samuel Longiaru) > Hi Sam, I've got the province of Saskatchewan converted already. I'll send it to you in a followup email. Thanks, Tyler -- Tyler Gunn ty...@egunn.com http://www.egunn.com/ ___ Talk-ca mailing list Talk-ca@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-ca
