3.Normalized Difference Vegetation Index(NDVI) images of Zhalong wetland were created by means of geometric correction and atmospheric correction for satellite data from four sets of Landsat images.以扎龙地区四期Landsat影像为基础数据,经过几何纠正、大气纠正等数据的处理工作,生成四期的扎龙地区的归一化差值...