Fig. 10
From: Sounding out life in the deep using acoustic data from ships of opportunity
Example of compromised quality data comparing unfiltered and filtered echograms with metrics of data quality. The 38 kHz data was collected by a prospective FV San Tongariro transiting from Hobart to New Zealand in Tasman Sea. (a) Displays calibrated and motion correction applied echogram before the application data processing filters outlined in Fig. 5. Panels (b,c) show SNR and background noise level calculated after background noise removal filter used in the filtering stage. (d) Depicts percentage of data retained after the filtering process. (e) Filtered data before applying secondary corrections for sound speed and absorption variation.
