On Tue, 2010-11-30 at 16:44 -0400, Donald Campbell II wrote: > Okay so now Potlatch 2 is showing up on the Edit page along with Bing > background so I've taken a look at my area. > > Since everything here was made from GPS tracks, how do I know which is > correct, the GPS or the overhead images? Perhaps I was driving on one side > of the road and drew it off to the side by a good 10 feet or so, perhaps I > had low accuracy... on the other hand perhaps the aerial photos are off by > a couple feet one way or another. > > How can I tell if I should scoot my tracks to match the overhead or leave > them alone and assume they're more correct? Also if the overhead images are > off a few feet how can I get that fixed?
This has been discussed here: http://help.openstreetmap.org/questions/1200/which-is-more-reliable-gps-traces-or-aerial-imagery As far as I can tell, the best answer you're gonna get is "it depends". Some GPS devices are more accurate than others. It's probably not a bad idea to get at least two traces of the same road (one from each side) and then draw the road in the middle of them? -- Cheers, Sven Arvidsson http://www.whiz.se PGP Key ID 760BDD22
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