Hi, Frederik Ramm wrote: > Because of that, it is a very pragmatic choice to say > "let's not have distances of more than a few kilometres between nodes" > because that will then reduce the error between the three different > types of "straight line" discussed above to something very small[*].
I had intended to add: [*] I haven't computed this myself due to lack of mathematical genius but if someone feels so inclined, I would be interested to know the answer to the following question: "Given that OSM accuracy is very seldom better than 1 metre, how far apart would two nodes have to be so that the difference between "straight line on mercator", "straight line on EPSG:4326", and "great circle" exceeds that accuracy? - The answer will probably be latitude dependent, so it would be good to know the value for some example countries. Bye Frederik _______________________________________________ talk mailing list [email protected] http://lists.openstreetmap.org/listinfo/talk
