COMBINING SATELLITE IMAGE ANALYSIS AND IN-SITU MEASUREMENT TO DETERMINE THE CONDITION OF CORAL REEF ECOSYSTEM OF MANDANGIN ISLAND EAST JAVA INDONESIAZAINUL HIDAYAH AND DWI BUDI WIYANTOAbstract Mandangin is a small island located on Madura Strait East Java Province of Indonesia. The total area of the island is approximately 2.65 km2. High population and the lack of awareness of the preservation of marine ecosystem were assumed to cause damage to the environment, in particular the coral reefs. The condition of coral reefs is one of the main indicators to assess the extent of environmental damage in small islands. This study aims to map the condition of coral reefs in the island using satellite imagery data World View-2. Lyzenga algorithms were used to classify the condition of the substrate. Analysis of satellite image data was then used as a guide to conduct reef check to determine the percentage of coral cover. Results showed that composition of the bottom substrate of the island consist of dead coral reefs (13.48%), living coral reef (2.37%), sand (54.74%) and a mixture of algae and coral fragments (29.40%). Through the Line Intercept Transect method, living coral cover were found in the range of values <35%. The percentage of living coral cover of the island can be categorized in poor condition. Damage of the coral reefs ecosystem of Mandangin Island was mainly caused by coral mining, destructive fishing and excessive use of marine resources.
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