APPLICATION OF ANALYTICAL AND LOG-RATIO METHODS FOR DERIVING BATHYMETRY FROM SENTINEL-2 SATELLITE IMAGERY: A CASE STUDY FROM SEMAK DAUN REEF PLATFORM SERIBU ISLAND, INDONESIA

• Main Author: Meliala, Litany
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/40095
• Institution: Institut Teknologi Bandung

There has been development on the derivation of bathymetric model from satellite imaging for non-navigable coastal waters. It is the purpose of this presented paper to assess the depth accuracy of bathymetric model derived from such optical satellite imagery. The study domain is situated in Semak Daun reef platform, Java Sea, Indonesia. The area represents shallow sub- and inter-tidal water with various benthic covers. Satellite imagery used here are retrieved from the European Space Agency Sentinel-2 satellite observation system. Two methods in deriving bathymetry from optical imagery are used. The first one is the empirical band ratio transform algorithm and second one is the analytical approach. Parameters involved in both models is obtained by means of calibration against in-situ data from single-beam echosounding survey. About 9% of in-situ data are used for the calibration, while the rests are used to validate the resulting bathymetric models. It is found that both methods can successfully be applied at depth of up to 10 m. The root mean square errors indicated by both models are comparable. Accuracy measures in the order of 1.9 m are obtained with coefficient of determination of 0.7. The results presented here confirm the applicability of satellite derived bathymetry for mapping shallow seabed complying to category zone of confidence C as of the International Hydrographic Organization standard.