Figure 3.

A depiction of the process with which animals are detected and counted using a coordination of thermal and SLR imagery. First, a time series of maximum pixel temperatures from thermal cameras are used to locate temperature peaks (a). Next, individual thermal video frames are reviewed to determine whether each peak is associated with a thermal signature of the size and shape that might be an animal (yellow circle in (b)). Such prospective ‘hot spots’ are denoted with a green ‘o’ in (a); pixel temperature peaks that did not meet this criterion are labelled with an ‘x.’ Finally, digital photographs with time stamps that match prospective hot spots are examined to confirm animal presence and determine species identity (b).