变化分析是多时相遥感影像的主要应用领域。以郭煌绿洲为例, 探讨一种应用多时相TM影像进行地表植被变化分析的新方法。结果证明, 用不同时相的NDVI影像进行彩色合成可以直观地反映地表植被的变化, 而利用色彩变换得到的各分量可以对变化特点进行定量分析。其中色度反映变化类型, 饱和度反映变化强度, 而亮度图像则反映地表植被多年来的总体长势。

Land cover change detection is an important applica ti on field of remotely sensed data In this paper, a new method for vegetation chan ge detection based on multitemporal Landsat TM images is introduced. Results of its application in vegetation change detection of Dunhuang Qasis show positive a spects of this method Color composition of multitemporal TM data gives an obviou s view of vegetation change in the stady area. Color components from color space transformation can be used for quantitative analysis of vegetation change. Hue and Saturation components indicate types and intensity of changes respectively. Lightness component shows general NDVI distribution over the study period. This new method can be easily applied to other change study fields.