Update flighttracker.py

tracker/flighttracker.py

@@ -197,13 +197,13 @@ def update(self, sbs1msg):
  if not self.__planedb_nagged:
  self.__planedb_nagged = True
  logging.error("icao24 %s not found in the database" % (self.__icao24))
-
- # Calculates the distance from the cameras location to the airplane. The output is in METERS!
- distance = utils.coordinate_distance(camera_latitude, camera_longitude, self.__lat, self.__lon)
- #Not sure we want to... commented out for now -> Round off to nearest 100 meters
- self.__distance = distance = distance #round(distance/100) * 100
- self.__bearing = utils.bearing(camera_latitude, camera_longitude, self.__lat, self.__lon)
- self.__elevation = utils.elevation(distance, self.__altitude, camera_altitude) # Distance and Altitude are both in meters
+ if self.__lat and self.__lon and self.__altitude:
+  # Calculates the distance from the cameras location to the airplane. The output is in METERS!
+  distance = utils.coordinate_distance(camera_latitude, camera_longitude, self.__lat, self.__lon)
+  #Not sure we want to... commented out for now -> Round off to nearest 100 meters
+  self.__distance = distance = distance #round(distance/100) * 100
+  self.__bearing = utils.bearing(camera_latitude, camera_longitude, self.__lat, self.__lon)
+  self.__elevation = utils.elevation(distance, self.__altitude, camera_altitude) # Distance and Altitude are both in meters
 
  # Check if observation was updated
  newData = dict(self.__dict__)