On Tue, Apr 6, 2010 at 1:22 PM, Robert Scott <[email protected]> wrote:
> I'd say about 95% of buildings are rectangles. About 99% of buildings are > purely orthogonal lines. We need to be careful about extracting shapes from products that are known to be downsampled. A quick look at Street View in my area shows that OSM has more detail in the building outlines than Street View, suggesting to me that MasterMap outlines have been simplified (often to rectangles) to make this particular product. We need to realise that whilst we map to a high level of detail and keep those details in our end products, the OS don't and often have simplified outputs. So it's a false assumption that the buildings in Street View are accurate or better than OSM can create by other means. Cheers, Andy _______________________________________________ Talk-GB mailing list [email protected] http://lists.openstreetmap.org/listinfo/talk-gb
