On Jun 5, 4:08 pm, Todd W <[email protected]> wrote: > Thanks for taking a look at it, Andrew. Apparently, I've forgotten my > basic geometry maths! > > Perhaps my ruler isn't very accurate, but when I open that link above, > the circle is about 3 meters short. I adjusted the cof param to try > something like 1200 and it was off by ~67 meters. > > Any advice on how to get a more accurate representation?
I think it is accurate. With cof=120, 20m = 24.5mm on my screen here. The circle's radius is 73mm = 2.979*20 = 59.59m, which is comfortably close to the 60m specified. With cof=1200, 200m = 15.5mm. The circle's radius is 45.5mm = 2.935*200 = 587m. That error seems a bit larger, but it's still only 2%. And it depends on all sorts of things including parallax in measurement. Bear in mind that the scale marker is constrained by the resolution of the screen, and because of the Mercator projection it's only accurate for horizontal distances at the centre of the map. If you're measuring anything else you will definitely get the wrong result. Andrew --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Google Maps API" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/Google-Maps-API?hl=en -~----------~----~----~----~------~----~------~--~---
