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This research was conducted on March 2019 in Barrang Caddi Island, Spermonde Archipelago. The acquisition of Sentinel-2A satellite imagery was on February 24, 2019. DOS method (Dark Object Substraction) was used to atmospheric correction , water column correction using Lyzenga algorithm with values of ki / kj = 0.679844349 and a = -0,39554029. Image classification analysis using IsoData and K-Means unsupervised classification method. Gound truthing using the UPT (Underwater Photo Transect) method. Basic information on spectral values is obtained from Sentinel-2A satellites using band 2 with 490nm, band 3 with 560nm, band 4 with 665nm, and band 8 with 842nm. The results show that there are 4 dominant objects including live coral, rubble, algae, sand and seagrass. The highest spectral reflectance can be detected by green band (560nm) with IsoData and K-Means classifications. Unsupervised classification using IsoData method has capability to detect live coral and while the K-Means method is capable to explore the seagrass.