On 25/03/2008 19:16, Iván Sánchez Ortega wrote: > <quote who="David Earl"> >> In Mercator distance is constant independent of orientation, isn't it? > > Wrong. Quoting Wikipedia: > > "While the direction and shapes are accurate on a Mercator projection, it > distorts the size." > > In other words, the Mercator projection is conformal, but not equidistant. > > In other words, it preserves shapes while deforming distances and areas > greatly. > > I think that your question really is in the lines of: > In Mercator, *in a small area*, the vertical scale is the same as the > horizontal scale, which is the same as any diagonal scale? The answer is > "yes". > > (You'll still suffer from a very tiny deformation, something like 1/100000 > perhaps - the smaller the area you're working in, the smaller the > deformation you'll be suffering from. And I think that's true for most map > projections.)
OK, I wasn't being specific enough. Yes, of course I meant at the scales that you tend to be editing at. David _______________________________________________ talk mailing list talk@openstreetmap.org http://lists.openstreetmap.org/cgi-bin/mailman/listinfo/talk
