*3.3. WorldView-3 Land-Sea Habitat Mapping at the Class Scale*

The best OA for the WorldView-3 multispectral and superspectral, deprived of and provided with the inner topobathymetry, were further studied at the class level by comparing their confusion matrices with that for the basic BGR (Figure 9).

Concerning the multispectral level, the optical dataset strongly improved the discrimination of the grass (27.7%) and wood (19.27%), as well as the road (15.93%). The coral reefs also benefited from a better differentiation (1.2%), partly due to the decline in omission misclassification with the offshore (−0.93%). The addition of the topobathymetric DSM confirmed the greater distinction between previous classes (grass, 27.5%; wood, 26.27%; and road, 19.27%), but also improved the ability to detect the roof (23.87%) and soil (8.53%) classes. The coral reefs' separability was also heightened (1.87%) owing to the decrease in omission misclassification with the nearshore (−0.57%).

Regarding the superspectral degree, the optical dataset enhanced with the MIR8 empowered to distinguish grass (27.6%), wood (25.53%), roof (22.87%), road (20.03%), and soil (14.6%) classes. The coral reefs were also better discerned (2.07%) given the reduction in omission misclassification with the nearshore (−0.93%). The integration of the DSM information to the optical+MIR1 dataset still upgraded the classification of the grass (27.33%), wood (27.1%), roof (24.5%), road (20.67%), and soil (12.97%). Nevertheless, the coral reefs' classification remained rigorously constant (2.07%).

**Figure 8.** Maximum likelihood classification maps of the land-sea coral reefscape using WorldView-3 topobathymetric digital surface model and optical dataset with: (**a**) Mid-InfraRed1 (MIR1); (**b**) MIR2; (**c**) MIR3; (**d**) MIR4; (**e**) MIR5; (**f**) MIR6; (**g**) MIR7; (**h**) MIR8.


**Figure 9.** Confusion matrices of the percent differences between the WorldView-3 basic blue-green-red classification validation and the best results for multispectral and superspectral combinations, deprived of and provided with WorldView-3 topobathymetric DSM.
