Cannat, Mathilde, Prampolini, Mariacristina, Mahato, Souradeep and Boutbien, Michel, 2024. Processed shipboard bathymetry and high resolution bathymetry acquired by Remotely Operated Vehicle VICTOR 6000 during the ROVSMOOTH, 2016-2017 cruise of RV Pourquoi Pas?

Shipboard bathymetry data were acquired during the ROVSMOOTH cruise onboard RV Pourquoi Pas?, with a RESON 7150 multibeam echosounder (12 KHz frequency, beam opening angle of 151°, and a ship velocity of 6 knots). The processed grid (50 m grid spacing; GEOTIFF file: batshipROVSMOOTH.tif) was produced with the Caraibes 5.0 software (@Ifremer).

High-resolution bathymetry data were acquired during three dives of ROV Victor 6000 (dives 01-639, 04-642 and 12-650) using a RESON 7125 echosounder mounted on the ROV frame, with an operating frequency of 400 kHz, a beam opening angle of 120°, a velocity of ~0.3 m/s, and maintaining an altitude ~50 m above the seafloor. Ultra-short baseline ROV positioning was poor due to the steep and irregular slopes. The processes grids (1 m grid spacing; GEOTIFF files: ROVSMOOTH_12_650_lowerslopes_recale.tif, ROVSMOOTH_04_642_AND_12_650_upperslopes_recale.tif, ROVSMOOTH_01_639_recale.tif) were therefore produced in two steps: first grids were produced for each ROV track with the Caraibes 5.0 software (@Ifremer); then these track by track grids were manually adjusted with the GlobalMapper software (@BlueMarble) and exported as GEOTIFF files.