I understand that the mapping of the sphere to a planar map has issues (!) near the poles. However, this isn't what I am talking about.
When you create a GPolygon and fill it, the area inside *is* a specific area on the surface of the earth. There is no problem near the north pole. In order to draw the polygon on a planar map, then each point inside the polygon needs to be mapped onto the plane. *Some* of these points fall outside the area which is representable on a google map. What I suspect happens is that the maps code does the fill after mapping the polygon outline on the planar map. The problem with this approach is that it doesn't provide the same answer due to the fill algorithm used. Philip On Sep 27, 12:31 am, "Maps.Huge.Info (Maps API Guru)" <[email protected]> wrote: > The maximum magnitude of latitude that can be handled by World > Mercator is around 86 degrees. Anything greater than that is subject > to nearly infinite error due to the projection characteristics. > > The problem is easy to understand if you think about what World > Mercator does. The idea with this projection is that latitude and > longitude lines are perpendicular to each other regardless of where > they lie on the globe. In reality, longitude lines converge as the > latitude increases, at the pole, you can put your foot on every > longitude line, so the error in this projection goes to infinity at > that point. Around 86 degrees, the error is so great that the > projection becomes useless. > > -John Coryat > > http://maps.huge.info > > http://www.usnaviguide.com > > http://www.zipmaps.net --~--~---------~--~----~------------~-------~--~----~ 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 -~----------~----~----~----~------~----~------~--~---
