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嫦娥一号IIM高光谱数据和月球轨道器LOLADEM数据的配准与月表地形校正及评价

DOI: 10.3724/SP.J.1047.2015.00118, PP. 118-125

Keywords: 地理配准,C校正,干涉成像光谱仪(IIM),月球轨道器激光测高仪(LOLA),嫦娥一号,地形校正

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Abstract:

在对月探测中,月表物质的可见光、近红外反射数据,是进行月表化学元素及矿物反演与制图的重要信息源。受月球表面地形起伏的影响,嫦娥一号干涉成像光谱仪(IIM)高光谱数据在开展月表参数定量反演前,须进行月表地形校正,还原月表真实的反射率信息。IIM高光谱数据和常用的美国LOLA月球DEM数据之间存在月球经纬度空间配准不精确的问题,对月表地形校正的精度产生了影响。以月表陨石坑为例,在两幅月球遥感影像上选取一定数量的同名点,使用多项式校正方法进行像元级配准,与直接使用经纬度开展空间配准作了对比分析,发现IIM高光谱数据与LOLADEM数据之间在经度方向存在平均约3.5个像元的位置偏差,纬度方向存在约1.95个像元的偏差。在此基础上,尝试将地球地形校正中使用的C校正方法运用到月球,探究在微弱大气散射环境下,月球陨石坑地貌的月表地形校正可行性。研究发现,经过像元级空间配准的数据在月表地形校正的效果上,比直接使用月球经纬度进行匹配的校正效果有明显提高。经过匹配和C校正,月表反射率与太阳入射角的余弦值之间的线性相关方程的斜率降低了89.4%,很好地消除月表陨石坑阴影地区和阳坡高亮区域的月表地形效应,恢复月表阴影区域的光谱信息。验证结果表明,校正后的月表局部遥感影像更接近于月表真实反射率,为后续利用IIM数据开展月表理化要素定量反演研究提供了可靠的科学数据保障。

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