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The retrieved datasets highlight several notable features of Hydrus including the ability to operate in dynamic currents, navigate complex terrain, and produce incredibly high-resolution data deliverables.<\/p>\n
Upon location, the vessel recorded a surface current of over 1.5 knots, with substantial wave action and 18 knots of wind. Hydrus was deployed from the vessel and tracked with Advanced Navigation\u2019s acoustic positioning system, Subsonus<\/a>. Once underwater, the vehicle descended to an operating depth of around 25m, with an altitude of 1m.<\/p>\n To capture high quality still images, with embedded georeferencing, Hydrus had a mission planned to capture images with 80% forward overlap and 60% lateral overlap. Due to the low altitude and high resolution required, Hydrus flew the mission at a slow speed, shooting video at 4K 30FPS, to reduce motion blur. Once at the mission site, Hydrus was able to run a \u2018lawnmower\u2019 pattern as planned.<\/p>\n Classic techniques to capture imagery in seabeds with swirling, dynamic currents can often prove difficult. Here, divers typically struggle to maintain constant positioning and remote operated vehicles (ROVs) can suffer from drag due to their tethers.<\/p>\n In contrast, Hydrus is able to utilise its doppler velocity log (DVL) to track its position over the seabed and use its high level of control authority from the unique seven thruster configuration to maintain constant lines \u2013 in spite of swirling, dynamic currents. This is evident in the movement of the kelp in the video below.<\/p>\nIntuitive Mission Planner<\/h4>\n
Capturing Sea Kelp Across Complex Seabed<\/h4>\n