Coral Reef Habitat Mapping: A Case Study In Mensanak Island- Senayang Lingga, Riau Province, Indonesia  Figure 3. Map of Reef Habitats In this study, the accuracy of the classified image was tested using 20 ground truthing sites throughout the study area. An overall accuracy of 76.12% was determined by dividing the total number of correctly classified spectra (the sum of the count along the major diagonal) by the total number of spectra considered in this study. In addition, Kappa analysis also calculated. Kappa coefficient (KHAT value) of 69.64% was achieved in this study. Relationship among substratum/benthos The relationship among substratum/benthos was evaluated in this study. The purpose of this analysis was evaluated the relationship among the benthos and investigate the capability of Landsat ETM+ for delineating of substratum/benthos. The correlation and coefficient determination among substratum/benthos is given in Table 2. Table 2. Correlation (r) and coefficient determination (r2) among substratum/benthos
This study found that relation live coral and sand has high coefficient determination (r2= 0.62) and follow by live coral and substrate (r2=0.32) and live coral and bio habitat (r2= 0.056). The highest coefficient determination meaning that two benthos could be differentiated easily. The relation between substrate and sand has the highest coefficient determination (r2= 0.79) and also coefficient correlation as mention above. It was mean, differentiation of this benthos easier when we compared with differentiation live coral and sand. The relation between bio habitat and other benthos was found very low. Based on these relationships, we could be interpreted that it was difficult to differentiate between bio habitat and others benthos (sand and substrate). |