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⚡️ Speed up method GlobalMercator.PixelsToTile by 9% #15

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⚡️ Speed up method GlobalMercator.PixelsToTile by 9% #15

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5 changes: 3 additions & 2 deletions opendm/tiles/gdal2tiles.py
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Original file line number Diff line number Diff line change
Expand Up @@ -206,6 +206,7 @@ class GlobalMercator(object):
def __init__(self, tileSize=256):
"Initialize the TMS Global Mercator pyramid"
self.tileSize = tileSize
self.invTileSize = 1.0 / tileSize
self.initialResolution = 2 * math.pi * 6378137 / self.tileSize
# 156543.03392804062 for tileSize 256 pixels
self.originShift = 2 * math.pi * 6378137 / 2.0
Expand Down Expand Up @@ -248,8 +249,8 @@ def MetersToPixels(self, mx, my, zoom):
def PixelsToTile(self, px, py):
"Returns a tile covering region in given pixel coordinates"

tx = int(math.ceil(px / float(self.tileSize)) - 1)
ty = int(math.ceil(py / float(self.tileSize)) - 1)
tx = int(math.ceil(px * self.invTileSize) - 1)
ty = int(math.ceil(py * self.invTileSize) - 1)
return tx, ty

def PixelsToRaster(self, px, py, zoom):
Expand Down