Figure 2
From: Accurate population estimation of Caprinae using camera traps and distance sampling
We measured the distances between desert bighorn sheep and the trail cameras imaging them, by printing out all of the sheep images, visiting the site, and positioning a human in the exact location that the sheep was imaged. We then used a range finder or metric tape to measure the distances. We supplemented these measurements by recording distances between the camera and several recognizable objects in the images (e.g. rocks, plants), to ensure accurate distance delineations for the sheep.
