[OSM-newbies] GPS vs Tracing

[Sven Arvidsson]

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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