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Figure 2. (a) SSS mosaic showing the Acoustic Backscatter Patterns (ABP), (b) the Independent Component 5 (ICS. highlighting targets, (c) final target map based on IC5>0.5 and (d) target size distribution based on the equivalent diameter of the target boundaries.

Figure 2 (a) SSS mosaic showing the Acoustic Backscatter Patterns (ABP), (b) the Independent Component 5 (ICS. highlighting targets, (c) final target map based on IC5>0.5 and (d) target size distribution based on the equivalent diameter of the target boundaries.

Related Figures (2)

Figure 1. (a) iUSV170 used for the benthic megalitter survey, (b) USV operates off the Thessaloniki Port close to the surface support vessel MV TYPHOON. target map was created Fig. 2c). The spatia ensity is observed at t! distribution is bimodal primary at 0.6m and as using ICS values greater than 0.5 distribution of the targets is he eastern part of the survey area, ( characterized by homogeneity. Slightly higher spatial d c lose to the breakwater (Fig. 2c). The target size presenting two local maximums; a econdary at 1.5m (Fig. 2d). Thirty three targets, a signi population, have simil 0.7m (Fig. 2d). ficant percentage (59%) of the ar dimensions, between 0.5 and Only seven targets (12.5%) greater than | m was detected in the survey area (Fig. 2d). The ground truthing survey showed that the water column of the area is characterised by high turbidity and poor visibility conditions and therefore the detection and the identification of the targets is a challenging task. Nonetheless, the visual inspection of many targets showed that represent man-made items like metallic pieces, car tires, wires, e.t.c. (Fig. 3). Moreover, the inspection revealed the colonization and encrustation of marine litter by marine biota.
Figure 1. (a) iUSV170 used for the benthic megalitter survey, (b) USV operates off the Thessaloniki Port close to the surface support vessel MV TYPHOON. target map was created Fig. 2c). The spatia ensity is observed at t! distribution is bimodal primary at 0.6m and as using ICS values greater than 0.5 distribution of the targets is he eastern part of the survey area, ( characterized by homogeneity. Slightly higher spatial d c lose to the breakwater (Fig. 2c). The target size presenting two local maximums; a econdary at 1.5m (Fig. 2d). Thirty three targets, a signi population, have simil 0.7m (Fig. 2d). ficant percentage (59%) of the ar dimensions, between 0.5 and Only seven targets (12.5%) greater than | m was detected in the survey area (Fig. 2d). The ground truthing survey showed that the water column of the area is characterised by high turbidity and poor visibility conditions and therefore the detection and the identification of the targets is a challenging task. Nonetheless, the visual inspection of many targets showed that represent man-made items like metallic pieces, car tires, wires, e.t.c. (Fig. 3). Moreover, the inspection revealed the colonization and encrustation of marine litter by marine biota.
Figure 3. Underwater photos of megalitter recovered by the ROV. References Fakiris E. and G. Papatheodorou (2012), Quantification of
Figure 3. Underwater photos of megalitter recovered by the ROV. References Fakiris E. and G. Papatheodorou (2012), Quantification of
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Marine And Environmental PollutionSide Scan Sonar
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