def get_tweet_geolocation(self, tweet, user_request):
"""
Ensure any geolocation on a Tweet is valid, and return the co-ordinates as a (latitude, longitude) tuple
"""
if self.tweet_has_geolocation(tweet):
logging.debug("Detecting geolocation on Tweet")
position = tweet.geo['coordinates']
easting, northing = convertWGS84toOSEastingNorthing(*position)
# Grid reference provides us an easy way with checking to see if in the UK - it returns blank string if not in UK bounds
if not gridrefNumToLet(easting, northing):
raise WhensMyTransportException('not_in_uk')
# Check minimums & maximum numeric grid references - corresponding to Chesham (W), Shenfield (E), Dorking (S) and Potters Bar (N)
elif not (495000 <= easting <= 565000 and 145000 <= northing <= 205000):
raise WhensMyTransportException('not_in_london')
else:
return position
# Some people (especially Tweetdeck users) add a Place on the Tweet, but not an accurate enough lat & long
elif hasattr(tweet, 'place') and tweet.place:
raise WhensMyTransportException('placeinfo_only', user_request)
# If there's no geoinformation at all then raise the appropriate exception
else:
if hasattr(tweet, 'geo'):
raise WhensMyTransportException('no_geotag', user_request)
else:
raise WhensMyTransportException('dms_not_taggable', user_request)
def test_geo(self):
"""
Unit test for geo conversion methods
"""
# Test co-ordinate conversions on the location of St James's Park Station
wgs84 = (51.4995893, -0.1342974)
osgb36 = (51.4990781, -0.1326920)
easting_northing = (529600, 179500)
gridref = "TQ2960079500"
self.assertEqual(convertWGS84toOSGB36(*wgs84)[:2], osgb36)
self.assertEqual(LatLongToOSGrid(*osgb36), easting_northing)
self.assertEqual(convertWGS84toOSEastingNorthing(*wgs84), easting_northing)
self.assertEqual(gridrefNumToLet(*easting_northing), gridref)
# Test heading_to_direction with a series of preset values
for (heading, direction) in ((0, "North"), (90, "East"), (135, "SE"), (225, "SW"),):
self.assertEqual(heading_to_direction(heading), direction)
