Based on ground observed information, standard deviation of spectrums, shape index, density and asymmetric of objects polygon are chosen as identification characteristics and fuzzy function is used to define the types of ploughed field. 然后选取影像中样地的光谱标准差、形状指数、对称度和密度作为耕地类别的识别特征,并采用模糊函数方法对各特征进行了定义。