MAIS图像大气订正及其在岩矿制图中的应用

：针对１９９５年９月１３日在内蒙大青山地区的一次ＭＡＩＳ航空遥感飞行试验，给出了一种以地面大气同步测量为前提、基于计算机查找表的大气订正方法。该方法具有简单、实用等特点，特别适合于像航空成像光谱遥感这样大数据量的图像定量信息获取。在可见、近红外光谱区（０．４～１．２μｍ），该方法的订正精度约为８．５％（总误差），即反射率在３％～５０％范围内时，反射率获取精度约为０．００２～０．０５反射率单位。利用大气订正后的ＭＡＩＳ反射率图像，得到了中粒钾长花岗岩、绿泥化片麻岩和灰岩这三种岩矿在该试验区的空间分布。与地面勘查结果比较表明，大气订正后的高光谱分辨率航空成像遥感数据（如ＭＡＩＳ）可用于干旱、半干旱地区的岩矿分布研究与制图。

Atmospheric Corrections of MAIS Images and Its Application to Surface Mineral Mapping

According to the MAIS inflight experiment at the semi arid area of Inner Monogo lia on September 13 1995,a method of atmospheric cocrection is presented which i s based on computer lookup table and simultaneous ground measurements of atmosph eric properties.Simplicity and practicality are the distinguishing features of t his method,so it is especially suitable to correct atmospheric effects on airbor ne imaging spectrometer data.In the visible and near infrared wavelengths,its a ccuracy is about 8.5%,i.e.,the uncertainty of derived near nadir reflectances i s within 0.002-0. 05 in reflectance unit at ground reflectance between 3% and 50% .Using this correction method,the corrected reflectance images are used to map t he surface mineralogy.Comparisons with the results of perambulation at ground de monstrate that high spectral resolution airborne imaging spectrometer data after atmospheric corrections,such as corrected MAIS reflectance data,can be used to produce detailed mineralogical maps in arid and semi arid terrains.