In this case, the energy loss due to the extra device in the active PMS was 4.7% greater. However, it is pointed out as a limitation that passive and active PMS were analyzed under different conditions. Gang et al. [11] introduced a hybrid UAV system using a fuel cell and a solar ...
3.1. State of the Art: Drones in Protected Areas 3.1.1. Wildlife Research and Management Manned aircrafts have been traditionally used to complement ground-based wildlife surveys, but under-resourcing of many protected areas prevent their more widespread use. Besides, a significant number of aerial...