[OSM-talk] OpenStreetMap sat image offset
schuyler at nocat.net
Tue Mar 14 13:32:22 GMT 2006
When you consider that Landsat 7 provides a ground resolution of 15m
per pixel from an orbit of something like 750km up, it's not too
astounding that the orthorectification is sometimes off by a few
pixels... :) That doesn't make it less frustrating, of course.
* On 14-Mar-2006 at 3:38AM PST, Andy Robinson said:
> The accuracy of the background Landsat satellite imagery is not as accurate
> as the gps tracks laid down onto OSM. As a result its typical to find a 50m
> (or even more occasionally) offset.
> Andy Robinson
> Andy_J_Robinson at blueyonder.co.uk
> >-----Original Message-----
> >From: talk-bounces at openstreetmap.org [mailto:talk-
> >bounces at openstreetmap.org] On Behalf Of Collinson Mike
> >Sent: 14 March 2006 10:58
> >To: talk at openstreetmap.org
> >Subject: [OSM-talk] OpenStreetMap sat image offset
> >I've just used the OSM Online editor for the first time. I notice that the
> >satellite images show roads an estimated 50m north of corresponding tracks.
> >It is the same for my own and other tracks. Is this deliberate? Or is
> >there an issue with southern hemisphere data? As I recall Google maps
> >did/does a similar thing.
> >Mike Collinson
> >Sydney, Oz
> >talk mailing list
> >talk at openstreetmap.org
> talk mailing list
> talk at openstreetmap.org
More information about the talk