http://www.flightsafetyaustralia.com/2016/03/phantom-drone-avoids-obstacles/
[youtube https://www.youtube.com/watch?v=JJPSSqMQajA&w=560&h=315]
[youtube https://www.youtube.com/watch?v=l49mgGSsb-0&w=560&h=315]
[youtube https://www.youtube.com/watch?v=79eUwqtNwvY&w=560&h=315]