Table 3. Test set EUNIS substrate classification.

	Mud and sandy mud	Sand and muddy sand	Mixed sediment	Coarse sediment	Class error
Mud and sandy mud	1229	984	55	32	0.47
Sand and muddy sand	252	13039	21	292	0.05
Mixed sediment	92	208	126	252	0.81
Coarse sediment	27	1088	73	1808	0.40
Observed agreement	82.76%
Expected agreement	57.23%
Kappa	0.60
Standard error	0.01	Z = 119.2	P-value < 0.001
Balanced error rate:	0.43