Fig. 6

Heatmap illustrating the Spectral Angle Mapper (SAM) scores between the measured spectra for all 21 debris subgroups, comprising seven plastic types and three background water conditions including clear (C), turbid (T), and foamy (F).

Heatmap illustrating the Spectral Angle Mapper (SAM) scores between the measured spectra for all 21 debris subgroups, comprising seven plastic types and three background water conditions including clear (C), turbid (T), and foamy (F).