Yes, back in my early osm days I yahoo'd Saint Clair in Western Sydney, only to fin much later when I went out with a gps that the alignment was really bad ;-(
On Fri, Jun 12, 2009 at 9:43 PM, Liz <ed...@billiau.net> wrote: > On Fri, 12 Jun 2009, Delta Foxtrot wrote: > > > I've come to the realisation that every road (and > > > everything that was placed in reference to the roads) in the > > > suburb where I live is out by about 8-10m. Much of > > > Brisbane's road system seems to have been traced off the > > > Yahoo imagery, apparently without aligning it to fixed > > > points before hand. > > > > 8-10m isn't that much of an error to be honest. There really isn't any > such > > thing as perfect data if you are using consumer grade equipment of any > > sort, things will improve over the next 10 to 20 years with other > > constellations of GPS like sats starting to broadcast, but until then 10m > > is as good as it gets for the most part for most things unless you spend > a > > lot of time getting very very accurate positioning. > > > There are definitely suburbs in SW Sydney where we have seen the same - the > photos have not been aligned with any known points. > There are tricks in JOSM for moving these areas en masse - can't confirm > for any other editor. > > > I think that often the amount was greater than 10 metres. > But we aren't making a perfect plan of the area - we are making a map, and > to me it is an aid to navigation, so the exact placement is not as important > as the relative positions of the objects. > > > But we can improve the accuracy over time as DF notes. > > > > > _______________________________________________ > Talk-au mailing list > Talk-au@openstreetmap.org > http://lists.openstreetmap.org/listinfo/talk-au > > -- Franc
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