code: def meters(self):
          
          latitude, longitude = self.latitude_longitude
          meter_x = longitude * ORIGIN_SHIFT / 180.0
          meter_y = math.log(math.tan((90.0 + latitude) * math.pi / 360.0)) / (math.pi / 180.0)
          meter_y = meter_y * ORIGIN_SHIFT / 180.0
          return meter_x, meter_y
docs: Gets the XY meters in Spherical Mercator EPSG:900913, converted from lat/lon in WGS84