DEEP LEARNING APPROACH FOR FLOOD DETECTION USING SAR IMAGE: A CASE STUDY IN XINXIANG

Abstract. With the gradual warming of the global climate, frequent floods have caused huge losses to human life and property. Flood mapping by SAR image has been an important topic, and it is increasingly important to use deep learning method to extract flood information. In order to achieve automatic flood extent extraction, this paper proposes an attention mechanism-based water body extraction network with GF3 images, and successfully use it for flood detection in Xinxiang, Henan, China. In this paper, the proposed network incorporates the channel attention mechanism and position attention mechanism based on U-Net, to improve the efficiency and accuracy of water extraction, ignore the unimportant information by learning the weight and make the model focus toward the important information related to the water body. The OA of our method can reach 0.959 and Recall can reach 0.942 by verifying four sets of test data. Experiments show fast flood mapping in Xinxiang can be achieved by our method.