【摘要】 提出一种利用气象卫星数据研究沙漠绿洲时空变化规律的方法。该方法采用归一化植被指数反映绿洲植被的发育程度, 借助裸沙土壤线校正法消除大气和土壤背景值的影响, 特别是, 提出的等面积校正法实现了不同年份间遥感数据的对比。最后, 将该方法用于内蒙古额济纳绿洲面积变化规律的研究中, 取得了良好效果。更多还原

【Abstract】 A method is provided to monitor the changes of area covered by vegetation with time on the regional scale by using meteorological satellite images. The images, which are corrected by Bare-Sand Soil Line, are used to get NDVI that indicates the vigor and amounts of vegetation. A new method, which is called Equal Area Method, is given to calculate the area of oasis in different years,and is applied to Ejina oasis.It is shown that the area of this oasis has decreased in recent 14 years.更多还原