Abstrakt

SHALLOW WATER BATHYMETRY USING LOG-LINEAR INVERSION TECHNIQUE: A CASE STUDY AT VIZHINJAM

Archa Raj, P. Sabu

Shallow water bathymetry of ocean is carried out to get the details of near shore bottom relief, which is important for navigation as well as for porting facilities. The conventional method of bathymetric derivation uses the echo sounder boarded on ship, for measuring water depth but they are labour-intensive and time-consuming. The remote sensing techniques derive water depth from multiple band satellite imagery, utilizing the optical properties of water column. The present work derives shallow water bathymetry using log-linear inversion technique from the multiple band Landsat Thematic Mapper image at a study area near Vizhinjam Harbour. The results obtained were validated using the sounding data taken using echo sounder which gave a RMSE of 1.9513 and the percentage error in analysis of depth using this method was obtained to be 26.22%.