策勒绿洲植被覆盖动态变化遥感研究

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。

Study on Dynamic Change of Qira Oasis Plant Cover Based on Remote Sensing

The main purpose of the paper is to workout NDVI according to LANDSAT TM image of 1990 and XI multi\|spectral SPOT image of 1998 in Qira. In the foundation of ecological character of arid oasis and research achievement, corresponding relation of plant index pixel grade and cover grade are found and NDVI is transformed into plant cover graph. Finally, variation of vegetation environment quality from 1990 to 1998 is evaluated according to distribution of quantity and space condition rendered by plant cover digital image and exploiting and managing ways are pointed out. Comparing the two period plant cover grade images with local statistics materials, the paper points out that the development of Cele oasis sandy desertification is controlled by two important reasons which are severe influences of nature and humanity. Therefore, in order to ameliorate the local ecological environment, people lived in Cele County should work hard to plant numerously to preserve their hometown and reduce the degree of sandy wind offensive, develop social economy.