1. Pacific Gas & Electric, 2014. Power line safety and trees. http://www.pge.com.
2. Linkster:enabling efficient manual inspection and annotation of mined data;Bird,2010
3. Beyond visual range obstacle avoidance and infrastructure inspection by an autonomous helicopter;Merz,2011
4. Knowledge-based power line detection for uav surveillance and inspection systems;Li,2009
5. Detection of vertical pole-like objects in a road environment using vehicle-based laser scanning data;Lehtomäki;Remote Sens.,2010