[OSM-newbies] Trust GPS or Yahoo aerial imagery?

[Dave Clark]

I can think of two reasons why you'd want to use your data instead of 
Yahoo's:

1. Yahoo's images are copyrighted: If we consistently used their images 
instead of our data, they could be considered a derivative work, and 
possibly subject to copyright issues.

2. A second GPS would likely follow your track: your data is likely more 
accurate for the end-user of the data.

Dave



Gervase Markham wrote:
> I just did a GPS track of some roads, and uploaded it. Now I see it on 
> the main map, it seems that the roads are consistently few metres north 
> of where they are on the Yahoo aerial imagery. Do I move them to match, 
> or do I trust the GPS over Yahoo (i.e. are the Yahoo images offset a bit)?
>
> Gerv
>
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