Hello everyone!

Just wanted to share two papers that we published recently on approaches to deal with counting errors when surveying wildlife populations using drone-derived orthomosaics..

In the first paper, we draw attention to some unintended counting errors that may arise specifically when building orthomosaics when animals are moving during the flight, and we discuss some strategies to mitigate these errors and potential solutions for further explorations. 

In the second paper, we develop an approach to estimate the abundance of aggregated wildlife populations from orthomosaic counts, taking into account multiple sources of variations (entries and departures of individuals during the sampling period, availability during flight, double counts..). We apply this approach to estimate the population of Giant South American River Turtles during a mass nesting event, what resulted in the description of the current world's largest known aggregation of freshwater turtles. 

Hope it is useful and I would be happy to receive any feedback! =)

Ismael