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⚡️ Speed up method GlobalMercator.PixelsToMeters by 60% #14

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⚡️ Speed up method GlobalMercator.PixelsToMeters by 60% #14

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7 changes: 6 additions & 1 deletion opendm/tiles/gdal2tiles.py
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Original file line number Diff line number Diff line change
Expand Up @@ -210,6 +210,7 @@ def __init__(self, tileSize=256):
# 156543.03392804062 for tileSize 256 pixels
self.originShift = 2 * math.pi * 6378137 / 2.0
# 20037508.342789244
self._resolution_cache = {}

def LatLonToMeters(self, lat, lon):
"Converts given lat/lon in WGS84 Datum to XY in Spherical Mercator EPSG:3857"
Expand All @@ -232,7 +233,11 @@ def MetersToLatLon(self, mx, my):
def PixelsToMeters(self, px, py, zoom):
"Converts pixel coordinates in given zoom level of pyramid to EPSG:3857"

res = self.Resolution(zoom)
res = self._resolution_cache.get(zoom)
if res is None:
res = self.Resolution(zoom)
self._resolution_cache[zoom] = res

mx = px * res - self.originShift
my = py * res - self.originShift
return mx, my
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