[2] [2] Wang Y Q, Ruan R Z, She Y J, et al. Extraction of Water Information based on RADARSAT SAR and Landsat ETM+［J］. Procedia Environmental Sciences, 2011, 10(1): 37-45.

[5] [5] Matgen P, Hostache R, Schumann G, et al. Towards an automated SAR-based flood monitoring system: Lessons learned from two case studies［J］. Physics and Chemistry of the Earth, 2010, 36(7): 44-48.

[6] [6] Tong X H, Luo X, Liu S G, et al. An approach for flood monitoring by the combined use of Landsat-8 optical imagery and COSMO-Sky Med radar imagery［J］. ISPRS Journal of Photogrammetry and Remote Sensing, 2018, 136(1): 226-230.

[12] [12] Guo Q D, Pu R L, Li J L, et al. A weighted normalized difference water index for water extraction using Landsat imagery［J］. International Journal of Remote Sensing, 2017, 38(19): 5430-5445.

[13] [13] Hahmann T, Martinis S, Twele A, et al. Friedrich-shafen: Extraction of water and flood areas from SAR data［C］. European Conference on Synthetic Aperture Radar， 2008.

[14] [14] Hong S, Jang H, Kim N, et al. Water area extraction using RADARSAT SAR imagery combined with landsat imagery and terrain information［J］. Sensors, 2015, 15(3): 6652-6667.

[15] [15] Huang W L, DeVries B, Huang C Q, et al. Automated extraction of surface water extent from sentinel-1 data［J］. Remote Sensing, 2018, 10(5): 797.

[16] [16] Ji L Y, Gong P, Geng X R, et al. Improving the Accuracy of the Water Surface Cover Type in the 30 m FROM-GLC Product［J］. Remote Sensing, 2015, 7(10): 13507-13527.

[18] [18] Lv W, Yu Q, Yu W. Water extraction in SAR images using GLCM and Support Vector Machine［C］. Beijing: IEEE International Conference on Signal Processing， 2010.

[19] [19] Mason D C, Giustarini L, Garcia-Pintado J, et al. Detection of flooded urban areas in high resolution synthetic aperture radar images using double scattering［J］. International Journal of Applied Earth Observation and Geoinformation, 2014, 28: 150-159.

[20] [20] Musa Z N, Popescu I, Mynett A. A review of applications of satellite SAR, optical, altimetry and DEM data for surface water modelling, mapping and parameter estimation［J］. Hydrology and Earth System Sciences, 2015, 19(9): 3755-3769.

[23] [23] Sohn H G, Song Y S, Kim G H. Detecting Water Area During Flood Event from SAR Image［C］. Springer-Verlag: International Conference on Computational Science & Its Applications， 2005.

[24] [24] Sun W W, Du B, Xiong S L. Quantifying sub-pixel surface water coverage in urban environments using low-albedo fraction from landsat imagery［J］. Remote Sensing, 2017, 9(5): 428.