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Made pixels_to_meters helper

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Chris Pham
2018-01-20 13:06:28 -08:00
parent 475c3aebcd
commit 1f1a1d7112
1 changed files with 11 additions and 0 deletions
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11
ground_station/resources/core/mapping.py
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@@ -75,6 +75,9 @@ class GMapsStitcher(object):
def _pixels_to_degrees(self, pixels, zoom): def _pixels_to_degrees(self, pixels, zoom):
return pixels * 2 ** (21-zoom) return pixels * 2 ** (21-zoom)
def _pixels_to_meters(self)
return 2 ** self.zoom / (156543.03392 * math.cos(math.radians(self.latitude)))
def _grab_tile(self, sleeptime=0): def _grab_tile(self, sleeptime=0):
# Make the url string for polling # Make the url string for polling
# GET request header gets appended to the string # GET request header gets appended to the string
@@ -115,3 +118,11 @@ class GMapsStitcher(object):
# Magic Lines # Magic Lines
degree = self._pixels_to_degrees((iterator - self.num_tiles / 2) * _TILESIZE, self.zoom) degree = self._pixels_to_degrees((iterator - self.num_tiles / 2) * _TILESIZE, self.zoom)
return math.degrees(math.pi / 2 - 2 * math.atan(math.exp(((lat_pixels + degree) - _EARTHPIX) / _pixrad))) return math.degrees(math.pi / 2 - 2 * math.atan(math.exp(((lat_pixels + degree) - _EARTHPIX) / _pixrad)))
def fetch_tiles(self):
# cap floats to precision amount
self.latitude = self._fast_round(latitude, _DEGREE_PRECISION)
self.longitude = self._fast_round(longitude, _DEGREE_PRECISION)
#grab the pixels per meter