On 7 Dec 1941, the US Naval base, at Pearl Harbor, Hawai’i, was attacked from the air. Among the many vessels that were lost, the USS Arizona and USS Utah are now National Historic Landmarks, under the care of the National Park Service. Multibeam Sonar, LIDAR, and photogrammetry were used to survey the ships, monuments, and other historical structures. These data will be tied together to create a 3D visualization of the underwater and above-water structures; providing a valuable tool to allow the US Park Service to monitor degradation of the ships over time. The data will also be used to give park visitors a unique view of the ships.

The Sonic 2024 was used to survey most of the Arizona using a small vessel of opportunity. Due to very shallow water and the Memorial itself, a Sonic 2020 was mounted on an Unmanned Surface Vessel (USV) to survey the areas where the manned vessel could not survey. The USS Utah was surveyed solely with the Sonic 2024. R2Sonic I2NS provided inertial navigation. QPS QINSy software was used for the multibeam data collection. Multibeam data were post processed in QINSy, Fledermaus, and HyPack. Applanix POSPac processing was also employed for PPK positioning. LIDAR was used to scan the above-water structures. Dive teams performed visual inspection and photographed the hull structures.

A big mahalo goes out to the following:

• National Park Service for coordinating the activities.
• Autodesk’s Stategic Projects division for project management, tying all the data together, and underwater photogrammetry.
• R2Sonic for the bathymetric survey and post processing the 2024 data.
• eTrac for supplying bathymetric survey talent and post processing the 2020 data.
• Deep Ocean Engineering for providing the USV for the 2020 survey.
• Gilbane Building for providing land surveying and LIDAR.
• U.S. Navy dive team and the U.S. Navy Public Affairs.