[talk-au] Mini Roundabouts.
snowgum at gmx.com
Sun May 2 14:21:04 BST 2010
On 02/05/10 22:37, Steve Bennett wrote:
> It's not just "rendering" - it also affects how it appears on a GPS.
> Presumably more accurate circles mean more accurate distance
> calculations, too. These aren't terribly important considerations, but
> worth bearing in mind the next time we're having a "but all
> information is important! we must be as accurate as possible in all
> circumstances!" debate.
Not really. The diameter of the roundabout is going to have a much
greater bearing on "total distance" than the number of nodes. Diameter
is something very difficult to get even approximately right when using a
GPS as the data source. And equally important for the distance
calculation is the degree of "cutting the corner" by individual drivers
when negotiating said roundabouts.
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