Mapping of Shallow Waters Substrate Using Google Earth Digital Images - Biawak Island, Indonesia

Remote sensing technology is seen as a very effective and efficient way of monitoring and mapping the earth's surface. However, the higher the resolution possessed by remote sensing satellites, the more expensive the resulting data will be. Behind that, with the development of technology and information disclosure, now researchers can take advantage of satellite data for free from several websites. One site that provides satellite imagery data for free is GE. Data from GE has been widely used for coastal area studies, including shallow water bottom substrate mapping. With the availability of satellite imagery data, this study aims to map the shallow water bottom substrate using GE imagery. The digital image processing approach is based on a water column correction technique (Lyzenga's algorithm). The area of interest in this study is Biawak Island which is in Indramayu Regency, West Java. The results of this study obtained the value of the attenuation coefficient (ki/kj) of the band 2 and band 3 pairs of 1.152. Based on the results of this study, the bottom substrate of shallow waters on Biawak Island consists of five different substrate classes: sand, rubble, silt, dead coral, and live coral (biotic), with the dominant type of substrate being sand. The classification of bottom water objects in this study shows that GE imagery can be used to determine the bottom substrate for shallow waters.