STUDY ON EVOLUTIONS OF JIANGSU RADIATING SANDBANKS BASED ON SAR IMAGES

摘要

The main goal of this study is to obtain high-resolution data to describe the evolution trends of Jiangsu Radiating Sandbanks, which exhibit considerable quasi-regular variations. Because SAR images have the advantages of imaging underwater sandbanks and all weather, we collect different period images to analyses the temporal and spatial variability of Jiangsu Radiating Sandbanks. The result indicates that the evolutions of Jiangsu Radiating Sandbanks are both in two and three-dimension. The former is related to overall on/off shore sandbanks migration, whereas the latter is induced by the horizontal amplitude growth, migration, or length scale change of the quasi-regular topography. By using the methods of crisp enhancement, density slice, overlay analysis and supervised classification etc, we show the changes of primary sand ridges, and then conclude the evolution trends of the whole radiating sandbanks.