基于光谱混合分析的荒漠化评价方法

Evaluation method of desertification based on spectral mixture analysis

基于光谱混合分析技术,针对内蒙古科尔沁沙地提出了一种荒漠化信息提取的新方法。首先,应用光谱混合分析技术对研究区域的土地覆盖类型信息进行提取,以像元为单位计算出裸沙占地百分比,并通过与穗帽变换和NDVI(归一化植被指数)对比,验证了此技术应用的可行性;然后利用光谱混合分析结果建立荒漠化评价模型,对研究区域的荒漠化信息进行提取;最后利用实地调查数据进行精度验证。

Based on spectral mixture analysis （SMA）, a new method about obtaining desertification information for Keerqin sand land of Inner Mongolia was put forward. First, the types of land covering in research region was gained by applying SMA and the occupation ratio of bare sandy land was calculated according to pixel. The validity of this method was approved by comparing results of SMA with the Tasseled Cap and NDVI. Second, the evaluation model of desertification was built by using the results of SMA and then information about desertification of the research region was gained by using this model. Last, field research was carried out to test the precision of the model.