I agree with you. But I'm lost here : zoom = 11; mapSize = 640;
power = 2^zoom = 2^11 = 2048; realWidth = 256 * power = 256 * 2048 = 524288; oneDegree = realWidth / 360 = 524288 / 360 = 1456.355556; => onePixel = mapSize / oneDegree = 640 / 1456.355556 = 0.439453125° That's what I found for longitude. It's always constant in all point of the earth because it doesn't depend on the coordinates of the center point so I can use it. It works perfectly. But for the latitude span it's an other formula and I don"t manage to find it. I think it depends on angle done with the center of the earth but I don't find. On 1 juil, 14:00, Rossko <[email protected]> wrote: > On Jul 1, 12:41 pm, ftessier <[email protected]> wrote: > > > Yes I read this. But I don't really find what I'm looking for... > > I thought everything you needed could be found at this reference > -http://www.articlesbase.com/ecommerce-articles/how-to-make-google-sta... > > > ... I don't find any formula to calculate it from center point > > coordinates, zoom, image size... > > If you determine pixels-per-degree using those inputs, you can > determine the spans; if you know the centre and the spans you can > determine the corner coordinates very easily. --~--~---------~--~----~------------~-------~--~----~ 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 -~----------~----~----~----~------~----~------~--~---
