Developing Methodologies for Remotely Operated Vehicle Based Photogrammetry to Monitor Coral Reefs in the National Marine Sanctuary of American Samoa

Mesophotic coral ecosystems are a significant component of the coral reef environments in the National Marine Sanctuary of American Samoa (NMSAS). Stretching from 30m to more than 100m deep, these ecosystems are poorly explored as divers must use highly specialized diving techniques to reach these depths. This study explored the viability of using a small Remotely Operated Vehicle (ROV) to create photogrammetry models with the goal of enabling NMSAS to more efficiently assess and monitor mesophotic coral reefs. In this study, shallow water photogrammetry models created from both ROV and diving methodologies were compared to evaluate the feasibility of ROV based photogrammetry. Additionally a NMSAS Standard Operating Procedure was developed inclusive of ROV operations, camera settings, and transect strategies. This exploratory field research indicates that ROV based photogrammetry could be a promising option for mesophotic coral reef monitoring in the sanctuary. Additionally, ROV technology can engage local communities in ocean stewardship through videos, 3D models, and hands-on education initiatives. In conclusion, a small ROV can be utilized as a lower-cost, more efficient, and safer method for both shallow and mesophotic coral reef monitoring in remote locations while also serving as an exciting science communication tool.

Presentation Preference: Oral

Primary Presenter: Ella Ashford, Willamette University (ella.m.ashford@gmail.com)

Authors:

Ella Ashford, Willamette University  (ella.m.ashford@gmail.com)

Valerie Brown, National Marine Sanctuary of American Samoa  (valerie.brown@noaa.gov)