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The deep reef refugia hypothesis (DRRH) suggests that mesophotic coral ecosystems (MCEs) represent a sanctuary for various coral reef taxa from impacts of natural and anthropogenic stressors. The Pulley Ridge FL mesophotic reef was surveyed using unmanned vehicles and technical diving in 2015 and compared to vehicle surveys in 2003, to test the DRRH. The MCE sites surveyed consisted of at least 25...
Battery aging coupled with additional loads placed on the power system of the Mola Mola AUV required that the original battery pack be replaced with a higher capacity system. A set of requirements were assembled to ensure the new pack would be electrically compatible, safe, and of appropriate configuration for AUV use. Pressure tolerant SeaSafe lithium ion modules, produced by the Southwest Electronic...
A set of Matlab tools were developed to create seafloor mosaics from AUV photosurveys. The resulting mosaic products are used to guide instrument placement, ground-truth acoustic backscatter targets, and inspect sensor packages or other targets. Because of the positional sensitivity of these tasks, effort has been made to preserve the geographic distribution of the image content. After initial image...
A photomosaicking technique was improved by incorporating data from multibeam bathymetry acquired simultaneously with the seafloor images. AUV navigation logs are used to geographically place the images, as has been previously documented. This revision accounts for navigation offset and drift by using multibeam processing tools to refine image placement. The processed bathymetric grid combined with...
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