http://kinsentansa.blogspot.jp/2009/09/google-map.html より
Lv0 : 10000km = 10,000,000m, 81pix, 123,456.79012 m/pix, 0.00001 pix/m
Lv1 : 5000km = 5,000,000m, 81pix, 61,728.39506 m/pix, 0.00002 pix/m
Lv2 : 2000km = 2,000,000m, 66pix, 30,303.03030 m/pix, 0.00003 pix/m
Lv3 : 1000km = 1,000,000m, 66pix, 15,151.51515 m/pix, 0.00007 pix/m
Lv4 : 500km = 500,000m, 66pix, 7,575.75758 m/pix, 0.00013 pix/m
Lv5 : 200km = 200,000m, 53pix, 3,773.58491 m/pix, 0.00027 pix/m
Lv6 : 200km = 200,000m, 103pix, 1,941.74757 m/pix, 0.00052 pix/m
Lv7 : 100km = 100,000m, 103pix, 970.87379 m/pix, 0.00103 pix/m
Lv8 : 50km = 50,000m, 103pix, 485.43689 m/pix, 0.00206 pix/m
Lv9 : 20km = 20,000m, 84pix, 238.09524 m/pix, 0.00420 pix/m
Lv10: 10km = 10,000m, 84pix, 119.04762 m/pix, 0.00840 pix/m
Lv11: 5km = 5,000m, 84pix, 59.52381 m/pix, 0.01680 pix/m
Lv12: 2km = 2,000m, 67pix, 29.85075 m/pix, 0.02350 pix/m
Lv13: 1km = 1,000m, 67pix, 14.92537 m/pix, 0.06700 pix/m
Lv14: 500m = 500m, 67pix, 7.46269 m/pix, 0.13400 pix/m
Lv15: 200m = 200m, 54pix, 3.70370 m/pix, 0.27000 pix/m
Lv16: 200m = 200m, 106pix, 1.88679 m/pix, 0.53000 pix/m
Lv17: 100m = 100m, 106pix, 0.94340 m/pix, 1.06000 pix/m
Lv18: 50m = 50m, 106pix, 0.47170 m/pix, 2.12000 pix/m
Lv19: 20m = 20m, 85pix, 0.23529 m/pix, 4.20000 pix/m
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