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以新疆塔里木盆地北缘渭干河—库车河三角洲绿洲为研究区,采用CI700便携式野外光谱仪,通过大量的野外调查以及实地测点,分析了该绿洲盐渍化地区的几种典型地物(盐渍化地、细沙地、沙丘、棉花地等以及柽柳、骆驼刺、芦苇等)的光谱特性及其变化规律,尤其是对盐渍化地和盐生植被的光谱曲线的差异做出了分析,并根据实际情况,采用移动平均法进行了噪声去除,分析实测光谱数据噪声特征。同时利用导数光谱技术清除植被环境背景影响。并且也利用归一化的方法基本消除了不同程度的盐渍地光谱和同一采样点不同时期的盐渍地光谱由于采样时的光照条件、气候条件等所引起的光谱差异。在对实测光谱数据进行处理的基础上,并利用ENVI软件建立了小型的渭干河—库车河三角洲绿洲主要地物的光谱库,该库可服务于渭—库绿洲的地物调查、植被调查、植被分类和环境监测等遥感应用。
Taking the Weigan River and Kuqa River delta oasis in the northern margin of Tarim Basin, Xinjiang as the research area, CI700 portable field spectrometer was used to analyze several typical landforms in the oasis salinization area through a large number of field surveys and field measurements Salinized land, fine sand, sand dune, cotton land, etc., as well as tamarisk, camel thorn, reed, etc.), especially the difference of the spectral curves between salinized and saline vegetations Analysis, and according to the actual situation, using the moving average method of noise removal, analysis of measured spectral data noise characteristics. At the same time, the use of derivative spectroscopy to clear the background of vegetation environment. And also using the normalized method to basically eliminate the different degree of salinity spectrum and the same sampling point at different times of the salinity spectrum sampling due to light conditions, climatic conditions caused by the spectral differences. On the basis of processing the measured spectral data and using ENVI software, we established a small spectral database of the main features of the Weigan River-Kuqa River Delta oasis, which can serve for the investigation of ground objects in the Wei- Surveys, vegetation classification and environmental monitoring applications such as remote sensing.