On Tue, Jul 20, 2010 at 08:11:46AM +, Ed Avis wrote:
> However I'd like to point out that 'ground survey' versus 'OS' is a false
> dichotomy. Firstly the existing OSM topology is not always from ground
> surveys.
> More often than not it will be a trace from Yahoo aerial imagery. Secondly,
>
Simon Ward writes:
>Other data has been shown to be quite inaccurate compared to OSM,
>including mastermap data. Using our own collective knowledge just
>produces better results anyway.
I don't know what part of the country you are looking at, but in most cases
I've seen, the OS data is so much
Firstly I completely agree with the original point - unless the existing OSM
streets are clearly unfinished work (perhaps indicated by being drawn with
Potlatch but never given a street name, indicating no ground survey) it is not
right to just replace them wholesale with tracing from OS.
However
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