[Talk-ca] More Google Copying
Bégin, Daniel
Daniel.Begin at RNCan-NRCan.gc.ca
Mon Feb 22 15:00:05 GMT 2010
Hi Sam,
you wrote "And the other solution is to be copying directly from the NRCan paper map sheets". Well, it is almost true if you are not concerned by the accuracy.
But if you are, you must know that between 2003 and 2008, 9121 datasets were modified to fit the GeoBase alignment Layer.
http://www.geobase.ca/geobase/en/data/imagery/landsat/description.html
It improved the data (Canvec) accuracy to better than 30 meters for 93% of the files - average accuracy of 22 meters. In some area the displacement was up to 1200 meters !
Where is the problem? The data is now more accurate but the corresponding paper maps have not been reprinted (.pdf) and are still affected by accuracy problems!
BTW, if you are right about the data source you mentionned in "More Google Copying" tread - it could have been from NTDB data origionally - it shows what you will get in pdf's.
Daniel
________________________________
From: talk-ca-bounces at openstreetmap.org [mailto:talk-ca-bounces at openstreetmap.org] On Behalf Of Sam Vekemans
Sent: 21 février 2010 20:17
To: Dan Putler
Cc: Talk-CA OpenStreetMap; Sam Dyck
Subject: Re: [Talk-ca] More Google Copying
Hi,
Yup, i just sent off a nice message. Hopefully it will be recieved. I'll let you know if i get a responce back.
On Sun, Feb 21, 2010 at 4:42 PM, Dan Putler <dan.putler at sauder.ubc.ca> wrote:
Could the data be from the StatsCan RNF? That would explain the geometry
being off, while having street names on the ways.
Maybe?
Then if that's true... then i think it's fine what the user is doing.
Its still improving the map (from a blank map).
Once the NRCan data is available, then more work is needed (for everywhere for all the features). But again it's to improve the map. So the fact that the geometry is off. We need to ask, how much off is it?
... if it's within 10meters, then it's still acceptable (as thats the GPS standard, when no other sources are available).
Since GeoBase roads just has the basic linework is available. The solution would be to also convert the GeoBaseNRN data for Manitoba, then have the .osm files open in JOSM & adjust the OSM data to fit the GeoBase road network geometry.
And the other solution is to be copying directly from the NRCan paper map sheets (available as PDFfiles). they just need to be alligned with some identifing points (the sheets have corner coordinates on it) and matched to JOSM points. (i used Garmin MapSource to make a waypoint at the exact corners of the sheet to get it lined up)
A manual process, but if it's done by local people while adding more details, it shouldn't be that hard.
Cheers,
Sam
On Sun, 2010-02-21 at 16:34 -0800, Adam Dunn wrote:
> The NRN site confirms that names are not available in Manitoba (NRN
> for that province is on version 3) [1]. Sam, maybe you should send a
> nice email explaining that a blank map is better than an illegal one.
> This person has made edits to my hometown that I basically had to
> revert because the geometry was way off. Don't know what his source
> is...
>
> [1] http://www.geobase.ca/geobase/en/data/nrn/status.html
>
> Adam
>
> On Sun, Feb 21, 2010 at 4:03 PM, Sam Dyck <samueldyck at gmail.com>
> wrote:
> About an hour ago he/she was editing in Saskatoon, and has
> done a lot of work in Rural Manitoba to.
>
>
>
> On Sun, Feb 21, 2010 at 5:48 PM, Sam Vekemans
> <acrosscanadatrails at gmail.com> wrote:
> Not sure if this link works
> http://www.itoworld.com/product/osm/map?area=1372:7&show=users&sort=total-&colour=date:30
> But you can see whats going on in the area..
> (or just log in and zoom to the area to find the
> mappers)
>
> http://picasaweb.google.ca/lh/photo/Orkp7E40gO0fwyJ8AKlIZQ?feat=directlink
>
> Ya, it seems like alot of work has been done
> reciently.
>
> Cheers,
> Sam
>
>
> Twitter: @Acrosscanada
> Blog: http://Acrosscanadatrails.blogspot.com
> Facebook: http://www.facebook.com/sam.vekemans
> Skype: samvekemans
> OpenStreetMap IRC: http://irc.openstreetmap.org
> @Acrosscanadatrails
>
>
>
>
> On Sun, Feb 21, 2010 at 3:36 PM, Sam Dyck
> <samueldyck at gmail.com> wrote:
> I did, Geobase doesn't even have the street
> and lacks street names in Manitoba. (at least
> this is the case in the viewer. The Geobase
> data in Winnipeg appears to be out of date by
> at least 14 years in some cases.
> But yes, a mapping party would be a good idea,
> any other Winnipegers on this list?
>
>
>
>
> On Sun, Feb 21, 2010 at 5:18 PM, Sam Vekemans
> <acrosscanadatrails at gmail.com> wrote:
> Thanks for sharing.
> The user seems to be doing alot of
> great work.
> Did you cross-check with the GeoBase
> data?
> Im not sure what the spelling of it is
> in there.
>
> If anyone is in Winnipeg, perhaps a
> couch mapping party is needed?
>
> Cheers,
> Sam
>
>
> On Sun, Feb 21, 2010 at 3:05 PM, Sam
> Dyck <samueldyck at gmail.com> wrote:
>
>
> So I just got a job that
> involves entering addresses
> into Google Maps (don't ask),
> one of these streets, Drobot
> Place (all address in
> winnipeg), Google has either
> deliberately or accidentally
> named Drobol Place (here,
> compare Yahoo, Bing, City of
> Winnipeg Assesment, Google
> Street View (Needs Flash)).
> OSM makes the same mistake as
> Google, which leads me to
> beileve that the street and
> others were copied from
> Google. I really hate telling
> people that I caught them
> "cheating." (I'm sure it was
> an honest mistake) Could
> someone please contact the
> editor responsible (you can
> look him/her up, I don't want
> to name names. I would be
> willing to help with any
> followup and cleanup, and you
> can give them my username
> (sammuell) if you wish, I just
> can't bring myself to send a
> message explaining just how I
> caught them.
>
> Thanks
>
> Sam
>
>
>
>
> _______________________________________________
> Talk-ca mailing list
> Talk-ca at openstreetmap.org
> http://lists.openstreetmap.org/listinfo/talk-ca
>
>
>
>
>
>
>
>
>
>
> _______________________________________________
> Talk-ca mailing list
> Talk-ca at openstreetmap.org
> http://lists.openstreetmap.org/listinfo/talk-ca
>
>
> _______________________________________________
> Talk-ca mailing list
> Talk-ca at openstreetmap.org
> http://lists.openstreetmap.org/listinfo/talk-ca
--
Dan Putler
Sauder School of Business
University of British Columbia
_______________________________________________
Talk-ca mailing list
Talk-ca at openstreetmap.org
http://lists.openstreetmap.org/listinfo/talk-ca
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.openstreetmap.org/pipermail/talk-ca/attachments/20100222/58fc1586/attachment.html>
More information about the Talk-ca
mailing list