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An evaluation of the factors affecting ‘poacher’ detection with drones and the efficacy of machine-learning for detection

Doull, KE; Chalmers, C; Fergus, P; Longmore, S; Piel, AK; Wich, SA; (2021) An evaluation of the factors affecting ‘poacher’ detection with drones and the efficacy of machine-learning for detection. Sensors , 21 (12) , Article 4074. 10.3390/s21124074. Green open access

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Abstract

Drones are being increasingly used in conservation to tackle the illegal poaching of animals. An important aspect of using drones for this purpose is establishing the technological and the environmental factors that increase the chances of success when detecting poachers. Recent studies focused on investigating these factors, and this research builds upon this as well as exploring the efficacy of machine-learning for automated detection. In an experimental setting with voluntary test subjects, various factors were tested for their effect on detection probability: camera type (visible spectrum, RGB, and thermal infrared, TIR), time of day, camera angle, canopy density, and walking/stationary test subjects. The drone footage was analysed both manually by volunteers and through automated detection software. A generalised linear model with a logit link function was used to statistically analyse the data for both types of analysis. The findings concluded that using a TIR camera improved detection probability, particularly at dawn and with a 90° camera angle. An oblique angle was more effective during RGB flights, and walking/stationary test subjects did not influence detection with both cameras. Probability of detection decreased with increasing vegetation cover. Machine-learning software had a successful detection probability of 0.558, however, it produced nearly five times more false positives than manual analysis. Manual analysis, however, produced 2.5 times more false negatives than automated detection. Despite manual analysis producing more true positive detections than automated detection in this study, the automated software gives promising, successful results, and the advantages of automated methods over manual analysis make it a promising tool with the potential to be successfully incorporated into anti-poaching strategies.

Type: Article
Title: An evaluation of the factors affecting ‘poacher’ detection with drones and the efficacy of machine-learning for detection
Open access status: An open access version is available from UCL Discovery
DOI: 10.3390/s21124074
Publisher version: https://doi.org/10.3390/s21124074
Language: English
Additional information: © 2021 by the Authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
Keywords: drones; detection; camera; TIR; RGB; poachers; canopy; time of day; angle; automated
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL SLASH
UCL > Provost and Vice Provost Offices > UCL SLASH > Faculty of S&HS
UCL > Provost and Vice Provost Offices > UCL SLASH > Faculty of S&HS > Dept of Anthropology
URI: https://discovery.ucl.ac.uk/id/eprint/10130809
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