A workflow of open-source tools for drone-based photogrammetry of marine megafauna by K.C. Bierlich, Josh Hewitt, Clara N. Bird, David W. Johnston, Julian Dale, Enrico Pirotta, Robert S. Schick, Joshua D. Stewart, Leslie New, Elliott Chimienti, Jeremy A. Goldbogen, Ari S. Friedlaender, Mauricio Cantor, Leigh G. Torres

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