Result examples

Vertical offset corrections

Figure 2 shows the effect of the different vertical offset correction methods applied to an example dataset of >200 profiles. The static correction mainly improves the reflection coherence of individual lines (Figure 3) with several acquisition artifacts remaining in the data (black arrows, Figure 2a, b). As the survey was conducted over multiple days, a tide compensation basically detrends the individual profiles and improves the data quality (Figure 2c, d). Remaining misties are successfully corrected using a least-squares minimization approach (Figure 2e, f).

Figure 2: Vertical offsets (upper row) and effect on detected seafloor reflection (lower row) after static correction (a, b), tide compensation (c, d), and mistie correction (e, f), respectively.

2D TOPAS processing

The following figure illustrate the capabilities of the first workflow stage before (Figure 3, upper row) and after applying all processing steps (Figure 3, lower row). Both the full waveform and envelope of the examplary profile section are displayed for comparison. Besides compensating the vertical offsets (larger inset figures), a despiking algorithm was applied to remove abundant and random noise burst of 20 ms length (smaller inset figures).

Figure 3: Examplary TOPAS profile displayed as unprocessed full-waveform (a) and envelope (b) as well as processed sections (c) and (d), respectively.

3D interpolation results

The following figure illustrates (a) the sparse cube before and (b) the full pseudo-3D cube after interpolation via POCS algorithm.

Figure 4: Sparse (a) and interpolated (b) pseudo-3D TOPAS cube overlain by multibeam bathymetry data.

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Last update: Monday, 03 July 2023 at 09:46:51