Application of algorithm model for estimating shallow-water bathymetry in Tidung Island, Seribu Island using sentinel-2A satellite image

Abstract

The comparison and application of log-linear transformed and log-ratio transformed algorithm models to produce shallow marine bathymetry maps on Tidung Island, Seribu Islands, and Jakarta are still not widely studied. This study aims to compare and apply the better algorithm model in mapping shallow water bathymetry on Tidung Island, Seribu Islands. The goodness of fit tests (determination test and chi-squared test) are used to see the level of suitability of the model in mapping shallow water bathymetry. The result shows that there is a tendency for the log-ratio transformed algorithm to be the better model compared to the other algorithm for mapping bathymetry in Tidung Island, Seribu Islands, with a determination value (R2) of 0.58 and a chi-squared (X2) value of 2.08. In contrast, the log-linear transformed model has an R2 value of 0.57 and X2 of 2.17. This result is in accordance with the initial study of ocean color remote sensing (OCRS) development. The log-ratio transformed algorithm is therefore used to map shallow water bathymetry on Tidung Island, Seribu Islands, using the combination of blue, green, and hand a range of 0 – 6 meters.