Multibeam bathymetry data of RV Sonne cruise SO297, offshore Copiapó, Chile

The multibeam bathymetry was acquired with a Kongsberg Simrad EM122 system operating at 12 kHz with a beam width of 1° by 0.5°. The total swath width was set to 130° and high-density equidistant and chirp multi-ping modes were used to obtain a high-sounding density. Most of the multibeam data were acquired with a vessel speed of ~4 kn, with the remainder of the data being acquired at 7-8 kn. Data processing involved a triangulation filter with three iterations, and subsequent manual cleaning of the data. The data were gridded with a cell size of 50 m using a near-neighbor algorithm with a 60 m search radius.