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使用经严格配准的2个时相的TM和HRV图像数据为基础底料编制规一化植被指数图(NDVI),根据策勒绿洲特有的生态环境特征,研究植被指数灰度级与盖度级的对应函数关系,将其转换成植被盖度图。最终利用植被盖度图像所提供的各盖度级的数量和空间分配状况来评价图像所包括时段,即1990年至1998年期间植被环境质量的变化,为该区域生态环境综合治理提供新的研究方法。
The normalized vegetation index (NDVI) map was prepared based on two well-matched TM and HRV image data of two time phases. According to the unique eco-environmental characteristics of Cele oasis, the gray index and cover of vegetation index Corresponding function of level, it will be converted into vegetation coverage map. Finally, using the quantity and spatial distribution of the coverage levels provided by the vegetation coverage images to evaluate the period covered by the images, that is, the changes of the vegetation environmental quality during the period from 1990 to 1998, it provides a new study for the comprehensive management of the ecological environment in this area method.