环境一号卫星高光谱数据水体信息提取方法

Extracting water information from the HSI data of HJ-1A/1B satellite

环境一号卫星A星上的超光谱成像光谱仪(HSI)是中国第一个高光谱成像光谱仪。为充分利用HSI数据的高光谱特性,本文以2009年10月5日的影像为研究区,得到HSI数据影像反射率,分析水体等地类光谱特征差异及选择各地类敏感波段;利用传统指数NDVI和NDWI,构建新的基于指数的水体指数IWI,试验得出,IWI指数增加了各水体类的动态范围,IWI指数的水体信息更加丰富。精度检验结果表明,IWI指数提取优于ND-WI指数,水体信息提取精度增加10.91%,kappa系数提高0.09,总体精度增加4%。

HSI sensor of HJ-1A is the first Hyperspectral image in china. In order to use the high spectral property of HSI data, the HSI data of GuangXi on Oct 5, 2009 was taken as research area in the paper. The reflectance value of HSI imagery which is very useful and important for the next quantitative analysis of Remote Sensing was got. At the same time, the difference between water and other land types was analyzed and the sensitive bands of the typical land types were selected. In the experiment, the index of IWI which was builded based on the indexes of NDVI and NDWI enhanced the dynamic range of different water types and enriched water information. The comparative results showed that the accuracy based on IWI had the precision that was reflected by 10. 91% higher accuracy of water information, 0. 09 higher kappa coefficient and 4% higher overall accuracy.