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⚡️ Speed up method GlobalMercator.QuadTree by 23% #20

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⚡️ Speed up method GlobalMercator.QuadTree by 23% #20

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27 changes: 14 additions & 13 deletions opendm/tiles/gdal2tiles.py
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Original file line number Diff line number Diff line change
Expand Up @@ -209,7 +209,6 @@ def __init__(self, tileSize=256):
self.initialResolution = 2 * math.pi * 6378137 / self.tileSize
# 156543.03392804062 for tileSize 256 pixels
self.originShift = 2 * math.pi * 6378137 / 2.0
# 20037508.342789244

def LatLonToMeters(self, lat, lon):
"Converts given lat/lon in WGS84 Datum to XY in Spherical Mercator EPSG:3857"
Expand All @@ -223,10 +222,11 @@ def LatLonToMeters(self, lat, lon):
def MetersToLatLon(self, mx, my):
"Converts XY point from Spherical Mercator EPSG:3857 to lat/lon in WGS84 Datum"

lon = (mx / self.originShift) * 180.0
lat = (my / self.originShift) * 180.0

lat = 180 / math.pi * (2 * math.atan(math.exp(lat * math.pi / 180.0)) - math.pi / 2.0)
inv_originShift = 180.0 / self.originShift
lon = mx * inv_originShift
lat = my * inv_originShift
pi = math.pi
lat = 180.0 / pi * (2.0 * math.atan(math.exp(lat * pi / 180.0)) - pi / 2.0)
return lat, lon

def PixelsToMeters(self, px, py, zoom):
Expand Down Expand Up @@ -303,20 +303,21 @@ def GoogleTile(self, tx, ty, zoom):
return tx, (2**zoom - 1) - ty

def QuadTree(self, tx, ty, zoom):
"Converts TMS tile coordinates to Microsoft QuadTree"

quadKey = ""
"""Converts TMS tile coordinates to Microsoft QuadTree"""
# Preallocate list for faster concatenation
quadKey = [''] * zoom
ty = (2**zoom - 1) - ty
# Cache str for digits to avoid repeated calls in loop
digits = ('0', '1', '2', '3')
for i in range(zoom, 0, -1):
digit = 0
mask = 1 << (i-1)
if (tx & mask) != 0:
if tx & mask:
digit += 1
if (ty & mask) != 0:
if ty & mask:
digit += 2
quadKey += str(digit)

return quadKey
quadKey[zoom - i] = digits[digit]
return ''.join(quadKey)


class GlobalGeodetic(object):
Expand Down