=> (-180, 85.0511) 1 4 (0, 1) => (-180, 0) (1, 0) => (0, 85.0511) (1, 1) => (0, 0) 2 16 (0, 1) => (-180, 66.5133) (0, 2) => (-180, 0) (0, 3) => (-180, -66.5133) (2, 1) => (0, 66.5133) ... 12 16777216 (3638, 1613) => (139.7461, 35.3890) 8FCϝϧΧτϧਤΛºϐΫηϧͷਖ਼ํܗ ʹΓ͚ͨͷͰ͢ɻ ࠲ඪ Y Z ͱζʔϜ [ ʹΑΓࢦఆ͠·͢ɻ ਤλΠϧͱ