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| import math | |
| def deg2num(lat_deg, lon_deg, zoom): | |
| lat_rad = math.radians(lat_deg) | |
| n = 2.0 ** zoom | |
| xtile = int((lon_deg + 180.0) / 360.0 * n) | |
| ytile = int((1.0 - math.asinh(math.tan(lat_rad)) / math.pi) / 2.0 * n) | |
| return (xtile, ytile) |
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