Skip to main content
. 2016 Mar 17;6:22574. doi: 10.1038/srep22574

Figure 4. Simulated accuracies of ground count:UAV-derived count ratios under increasing numbers of paired samples.

Figure 4

For Lesser Frigatebirds Fregata ariel and Crested Terns Thalasseus bergii, the ground and UAV-derived count means and variances are set at the values provided in Supplementary Table 1. Each grey line represents the cumulative estimate of the G:U ratio over an increasing number of paired samples. Dashed black lines represent +/−5% of the true ratio, and solid black lines represent +/− 10% of the true ratio.