A Novel Approach to Extract Water Body from ASAR Dual-Polarized Data

35th International Symposium on Remote Sensing of Environment

地球科学;生态环境科学

Ma, Jianwei^1,2 ; Song, Xiaoning^1 ; Li, Xiaotao^2 ; Leng, Pei^1 ; Zhou, Fangcheng^1 ; Li, Shuang^1

College of Resources and Environment, University of Chinese Academy of Sciences, Beijing, China^1

China Institute of Water Resources and Hydropower Research, Beijing, China^2

关键词: Discrete wavelet transformation;    Dual-polarized;    Flood monitoring;    Fusion methods;    Po-yang lakes;    SAR(synthetic aperture radar);    Threshold methods;    Weather observations;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/17/1/012099/pdf
DOI  :  10.1088/1755-1315/17/1/012099

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

SAR (Synthetic Aperture Radar) has become a useful and efficient method for monitoring flood extent due to its capability of 24-hour and all weather observation. In this paper, a novel approach is proposed to extract water bodies from ASAR dual-polarized images. Firstly, a new SAR image was created from ASAR Dual-Polarized data using a discrete wavelet transformation (DWT) fusion method. Then, a modified Otsu threshold method was used to extract water bodies of Poyang Lake with the new fused image. Next, this image was compared with the one extracted from ETM+ data. The result showed that the fused image was feasible and more accurate. Besides, it could reduce the influences of shadow and noise. Moreover, the approach could be conducted automatically, which is very important under urgent condition for flood monitoring.