On Thu, 5 Feb 2009 15:52:43 +1100 Franc Carter <franc.car...@gmail.com> wrote:
> From a 'philosophical point of view', I tend to agree that suburbs > are made of > a set of boundaries between adjacent areas. This was not how I did it > in my first (very quick) attempt ;-( An advantage of having to sort out the legal issue means you get a bit of time to fiddle around trying out options before you get the full a-ok and import it ;) > The data is in shapefiles that define each suburb boundary > individually, so I'll have a think about how to extract out the > individual borders (suggestions > welcome) Hmm, so there's no real surety that 2 adjacent suburbs even share the same boundary? Perhaps then the single area option might have some merit from a 'getting the data in there' point of view.... or we write a convoluted script to correlate things... > One question about aligning them that springs to mind is 'what should > we align' - I wonder if the accuracy of the data is better than the > average accuracy > of a gps or yahoo imagery. That's a tricky question because it might be more 'accurate' because it might measure to an exact positional definition but is that useful or relevant to the OSM structure whereby a boundary down the middle of the road is more conceptually accurate.... Guess we have to get a small sample of the data into a city somewhere where we have plenty of GPS as a trial run (once we have the full ok). and see how it correlates to reality. GPS + Yahoo never correlate enough (at least in SA) to make it possible for both to be relevant :) _______________________________________________ Talk-au mailing list Talk-au@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-au
