月球表面光度行为的地域依赖性分析

Terrain dependence of the lunar surface photometric behavior

月球表面光度行为描述了月表物质反射的太阳光随入射、出射和太阳相角的变化,它取决于月壤颗粒的粒径和形状、孔隙度、粗糙度等物理特性和矿物成分等化学性质.本文利用嫦娥一号干涉成像光谱仪(IIM)2A级辐亮度数据,基于太阳相角-辐亮度二维直方图统计,可将月球表面划分为两种光度行为迥异的地域类型,二者FeO含量分别与月海和高地的值大致吻合.高地(阿波罗16号着陆点)和月海(澄海)区域的IIM数据验证了该划分方法的合理性.本文提出的直接依据IIM 2A级数据太阳相角-辐亮度二维直方图的划分方法,可以避免FeO含量划分月表光度单元中由于后期数据处理过程引入的误差.

The photometric behavior of the Moon＇s surface describes how the reflected solar radiation varies with incidence, emission and solar phase angles, which is dependent on the physical and chemical properties of the lunar soils, such as particle size and shape, porosity, and mineralogical composition. Using the Chang＇E-1 Interferometer Imager （IIM） Level 2A radiance data, the lunar surface is divided into two classes based on 2D histogram statistics with phase angle vs. radiance. The iron abundances for the two classes approximately agree with those for maria and highlands, respectively. The method is proved to be valid using the IIM data for highland （Apollo 16） and mare （Mare Serenitatis）. The 2D histogram statistics method based on IIM 2A data could avoid errors introduced by data post-processing of the IIM data.