caperren/osurc_mars_rover_2017_2018
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Added logic for num_sqares

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Chris Pham
2018-01-20 13:24:32 -08:00
parent 1f1a1d7112
commit 81c770fed6
1 changed files with 11 additions and 7 deletions
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18
ground_station/resources/core/mapping.py
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@@ -75,7 +75,8 @@ 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) def _pixels_to_meters(self):
# https://groups.google.com/forum/#!topic/google-maps-js-api-v3/hDRO4oHVSeM
return 2 ** self.zoom / (156543.03392 * math.cos(math.radians(self.latitude))) return 2 ** self.zoom / (156543.03392 * math.cos(math.radians(self.latitude)))
def _grab_tile(self, sleeptime=0): def _grab_tile(self, sleeptime=0):
@@ -117,12 +118,15 @@ class GMapsStitcher(object):
def _pixels_to_lat(self, iterator, lat_pixels): def _pixels_to_lat(self, iterator, lat_pixels):
# 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))) temp = math.atan(math.exp(((lat_pixels + degree) - _EARTHPIX)
return math.degrees(math.pi / 2 - 2 * temp / _pixrad)))
def fetch_tiles(self):
def fetch_tiles(self,):
# cap floats to precision amount # cap floats to precision amount
self.latitude = self._fast_round(latitude, _DEGREE_PRECISION) self.latitude = self._fast_round(self.latitude, _DEGREE_PRECISION)
self.longitude = self._fast_round(longitude, _DEGREE_PRECISION) self.longitude = self._fast_round(self.longitude, _DEGREE_PRECISION)
#grab the pixels per meter # number of tiles required to go from center latitude to desired radius in meters
if self.radius_meters is not None:
self.num_tiles = int(round(2*self._pixels_to_meters / (_TILESIZE / 2. / self.radius_meters)))