Two high-resolution bathymetry investigations were conducted in the Lion City at a temporal interval of 14 years. The first topographic dataset were collected using a Simrad EM3000 MBES in May, 2002. In the data collection process, the DSM212 beacon-aided GPS technology was used for the horizontal positioning of the sonar.The second topographic dataset was collected using a Sonic 2024 MBES in May, 2015. The horizontal positioning information was provided by the differential GPS technology (centimeter accuracy).