On 13/04/2010 11:20, Andrew Errington wrote:

> Having said that, I have just compared my changes with Google aerials, Google
> Maps, and another two mapping providers.  They are all different, but mine is
> a little high, so I am going to choose the next lowest contour.

If the place is in the UK, the recently released OS OpenData includes 
some resources you should look at. Both contour data and lakes are 
included in 
<http://wiki.openstreetmap.org/wiki/Ordnance_Survey_Opendata#Land-Form_PANORAMA>
 
apparently.

There is also VectorMap District which is to be released next month.

-- 
Steve


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