Original provider:\nBiodiversity Research Institute\n\nDataset credits:\nBiodiversity Research Institute\nHiDef Aerial Surveying Limited\nBureau of Ocean Energy Management (BOEM)\n\nAbstract:\nIn April 2023, the Biodiversity Research Institute (BRI) commissioned HiDef \nAerial Surveying Limited (HiDef) to conduct high-resolution digital video \naerial surveys in the Gulf of Maine. The surveys aimed to record marine \nmegafauna, seabirds, and human activity. The designated survey area is \napproximately 5 km off the coast of Maine\n\nA total of four surveys were conducted between May 2023 and January \n2024. HiDef designed the survey using 2.5 km- and 5 km-spaced transects \nacross the Gulf of Maine survey area, covering approximately 6,673 km².\n\nSurveys were undertaken using an aircraft equipped with four HiDef \ncameras with a sensor package designed and calibrated to achieve a \nresolution of 1.5cm Ground Sample Distance (GSD). Each camera sampled \na strip of ~ 104m width, separated from the next camera by ~ 17m, to \nprovide a combined sampled width of 416m within a 467m overall strip. All \nfour cameras were analyzed, achieving approximately 10% coverage of the \nsurvey area during each flight. \n\nData analysis followed a two-stage process in which video footage was \nreviewed (with a 20% random sample used for audit) and detected objects \nwere identified to species or species group level (again with 20% selected \nat random for audit). The audit of both stages requires 90% agreement to \nbe achieved.\n\nThe surveys recorded a total of 7,248 birds of 33 species and 534 non-avian \nanimals of 12 species, in addition to two dead birds. A further 409 birds and \n58 non-avian animals were recorded which were not assigned to a species. \nAn identification rate to species level of 94% was achieved throughout the \nsurvey period.\n
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(in review). 2025. Baseline Wildlife Surveys of the Gulf of Maine, 2023–2024. 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