I *think* i have made a tiny bit of progress but I'm still stuck. It seems that in a mercator projection the longtitude (x axis) scales normally. So because I am trying to get a % pixel position on the map, I can simply say "(percentage position * 360) - 180" to get the longtitude.
HOWEVER, latitude (y-axis) does not scale so simply, gridlines have a scaling factor of 1 at 0 degrees but spread out towards infinity at the poles. What I need is a bit of maths that I can use to convert a % or pixel position into a latitude. I have a suspiscion what I need might be called a reverse gudermannian function but it is at this point my knowledge and understanding of maths is clutching at straws. Does anyone have such a function that I can copy paste into my code to convert a % latitute position on a square map into a trye latitude value? On May 5, 10:54 pm, Kesuke <nick_dai...@hotmail.com> wrote: > Hate to bump, but someone must have done this as it's been asked here > a lot before (just with no clear answer). I'm sure one of us has the > maths for this ready to go. > > On May 2, 4:48 pm, Kesuke <nick_dai...@hotmail.com> wrote: > > > > > How do I convert a pixel position to a latlng. I've searched and > > searched but its suprisingly hard to get a clear answer. > > > For example, at zoom level 2 lets say I want to get the latlng of a > > position that is 40% along the x axis and 60% along the y-axis. > > > So; > > > 2^zoomlevel * 256 = 1024 pixel map. > > x co-ordinate = 1024 * 0.4 = 410 > > y co-ordinate = 1024 * 0.6 = 614 > > > How can i now convert those pixel co-ordinates (410,614) into a > > corresponding latlng? > > > I am using the bog-standard mercator projection.- Hide quoted text - > > - Show quoted text - -- You received this message because you are subscribed to the Google Groups "Google Maps JavaScript API v3" group. To post to this group, send email to google-maps-js-api-v3@googlegroups.com. To unsubscribe from this group, send email to google-maps-js-api-v3+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-maps-js-api-v3?hl=en.
