UNDERWATER BOTTOM TOPOGRAPHY DETECTION OF SHUANGZI REEFS WITH ENVISAT ASAR IMAGES ACQUIRED IN DIFFERENT TIME

摘要

Imaging mechanism of underwater bottom topography by SAR and underwater bottom topography detection model with SAR image is introduced. Underwater bottom topography of Shuangzi Reefs in Nansha islands is detected by this model with three scenes of ENVISAT ASAR images acquired in different time. Detection results are compared and errors are analyzed. Underwater bottom topography detection experiments of Shuangzi Reefs show that the detection model used in this paper is practicable. Detection results indicate that SAR images acquired in different time also can be used to detect underwater bottom topography, and detection results are affected by the ocean conditions in SAR acquiring time.