2023
DOI: 10.1111/mms.13011
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Aerial photogrammetry techniques using drones to estimate morphometric measurements and body condition in South American small cetaceans

Abstract: Aerial photogrammetry protocols using drones have proved efficient in monitoring free‐living cetaceans. In this work an aerial photogrammetry protocol using a drone was applied to estimate morphometric measurements and body condition variation in two endangered cetacean species, franciscanas (Pontoporia blainvillei, n = 122) and Guiana dolphin (Sotalia guianensis, n = 41). Sampling occurred in winter and summer in Babitonga Bay, southern Brazil. A 115 cm length object was used to calibrate the scale of measure… Show more

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Cited by 4 publications
(6 citation statements)
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“…High-resolution aerial drone imagery can allow detailed observations and be very informative, providing data on respiratory cycles, travel speed, morphometric measurements, body condition, individual marks, behavior, and group composition for numerous cetacean species (Baxter & Hamilton, 2018;Burnett et al, 2019;Fettermann et al, 2022;de Oliveira et al, 2023). Here, we present a case study applying high-resolution drone monitoring of Bryde's whales based on an opportunistic sighting in Ubatuba, southeastern Brazil.…”
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confidence: 99%
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“…High-resolution aerial drone imagery can allow detailed observations and be very informative, providing data on respiratory cycles, travel speed, morphometric measurements, body condition, individual marks, behavior, and group composition for numerous cetacean species (Baxter & Hamilton, 2018;Burnett et al, 2019;Fettermann et al, 2022;de Oliveira et al, 2023). Here, we present a case study applying high-resolution drone monitoring of Bryde's whales based on an opportunistic sighting in Ubatuba, southeastern Brazil.…”
mentioning
confidence: 99%
“…Four frames of adequate quality were obtained at altitudes of 21 m (n = 2) and 31 m (n = 2). Frames were selected to meet standard criteria for photogrammetry, such as clear focus, elongated body at the surface, the tip of the rostrum, caudal notch, and the body contour visible, and no body-arching and the whale centered in the field of view of the camera (Christiansen et al, 2016;Durban et al, 2016;de Oliveira et al, 2023), these steps were adopted to avoid possible inaccuracies during the analysis, such as lens distortion or body curvature, which could overestimate or underestimate the collected measurements.…”
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confidence: 99%
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