Marine Geoscience Data System
Processed sidescan sonar mosaics (GeoTIFF image format) from 9°50''N, East Pacific Rise, acquired in 2018, 2019 and 2021 during AUV Sentry near-bottom dives
Sidescan sonar data were collected during a total of 19 AUV Sentry dives conducted from R/V Atlantis and R/V Roger Revelle during 2018 Atlantis cruise AT42-06 (two dives); 2019 Atlantis cruise AT42-21 (ten dives); and, 2021 Revelle cruise RR2102 (seven dives). Track lines were spaced 170 m apart, with Sentry about 65 m above bottom, collecting 120 kHz sidescan data with an EdgeTech 2200-M in 2018 and 2019, and with an EdgeTech 2205 system in 2021. Sentry navigation was obtained using a 300 kHz Teledyne Doppler velocity log (DVL) and a Sonardyne AvTrak2 ultra-short baseline (USBL) acoustic positioning system, combined with an iXblue Phins inertial navigation system (INS), and a Paroscientific 8B7000-I Digiquartz depth sensor. Sonar data from all 19 dives were processed together using Chesapeake's SonarWiz software, including feature-matching with coincident near-bottom multibeam bathymetric data, and were gridded at 30 cm x 30 cm node resolution. The data are provided as two gridded mosaics to give a manageable file size, in GeoTIFF (raster) image format, in un-projected geographic coordinates. Funding was provided by National Science Foundation grants OCE-1834797, OCE1949485, OCE-1948936, and OCE-1949938.
Device Info
Device Info
Sentry (AUV)
The data have been processed/modified to a level beyond that of basic quality control (e.g. final processed sonar data, photo-mosaics).

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