Extraction and analysis of spectral characteristics of lakes in northeast China based on MERSI

Base on Northeast China region, according to land surface reflectivity of FY3B/MERSI data from 2011-2015, the underlying surface index of lakes and reservoirs, the original spectrum, normalized difference water index during different periods, were obtained. The monthly change was analyzed as well. Meanwhile, combined with GIS data, the model of extracting area was built. Using the TM data, the method was verified. The results indicated that the spectral reflectance are in accordance with the characteristics of water, with high reflection area in blue and green bands, low reflection area in near-infrared band (< 6%), and more obvious reflectance spectral characteristics corresponding to higher cleanliness of water. The method could make area extracting in large scale. The method has higher accuracy up to 90%, which provides a preliminary method for the application of domestic satellite data. (paper)