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thomersch/latlontotile.py

Created February 12, 2014 19:25
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Convert lat/lon to tile number
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latlontotile.py
import math
def lat_lon_to_tile(lat_deg, lon_deg, zoom):
def sec(x):
return 1/math.cos(x)
lat_rad = math.radians(lat_deg)
n = 2**zoom
xtile = n * ((lon_deg + 180) / 360)
ytile = n * (1 - (math.log(math.tan(lat_rad) + sec(lat_rad)) / math.pi)) / 2
return int(xtile), int(ytile)
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