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首页> 外文学位 >Multispectral photometric properties of the Martian surface at the Mars Exploration Rover landing sites.
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Multispectral photometric properties of the Martian surface at the Mars Exploration Rover landing sites.

机译：火星探测漫游者着陆点火星表面的多光谱光度特性。

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摘要

Mars Exploration Rover (MER) Panoramic Camera (Pancam) observations include multispectral data sets designed to support photometric analysis of Martian surface materials. This dissertation describes the numerical inversion of Pancam radiance on sensor data to determine the optimum spectral bidirectional reflectance model parameter configuration for the surfaces at the MER landing sites. The optimized reflectance models provide constraints on surface properties and allow the scattering characteristics of the materials at each landing site to be directly compared.; Radiance on sensor forward models are calculated using a customized implementation of the multiple scattering Discrete Ordinate Radiative Transfer (DISORT) package. The DISORT implementation includes a plane-parallel model of the Martian atmosphere developed from landed and orbital atmospheric observations and is capable of modeling all radiative processes that contribute to the observed radiance. The reflectance of the lower boundary in the DISORT implementation is specified by the Hapke bidirectional reflectance function in conjunction with a two parameter Henyey-Greenstein scattering phase function. The integration of the Hapke bidirectional reflectance with DISORT allows synthetic Pancam radiance on sensor images to be generated given an atmospheric and surface bidirectional reflectance model configuration and the observation geometry.; For each Pancam image in the photometric data set, a multidimensional radiance lookup table is generated that spans the requisite geometric and model parameter space. Optimization of the bidirectional reflectance model parameter set is conducted with a Levenberg-Marquardt nonlinear least squares algorithm where the iterative radiance forward models are calculated by multilinear interpolation within the appropriate model radiance hypercube.; Modeling results show that the single scattering albedo monotonically increases with wavelength (435, 600, 750, 1005 nm) at both landing sites, with the MER-A surface significantly brighter than the MER-B surface at all but the shortest visible wavelengths. With the exception of the MER-A 435 nm data both surface reflectance models have backscattering phase functions at all sampled wavelengths. The MER-A scattering phase functions exhibit larger backscattering lobes while the MER-B phase functions show greater asymmetry. The spectral variability of the model MER-B surface roughness is an indication of the coupled textural and compositional heterogeneity of the surface at the MER-B landing site.
机译：火星探索漫游者（MER）全景相机（Pancam）观测包括多光谱数据集，旨在支持火星表面材料的光度分析。本文描述了潘康辐射率对传感器数据的数值反演，以确定在MER登陆点表面的最佳光谱双向反射率模型参数配置。优化的反射率模型限制了表面性能，并允许直接比较每个着陆点处材料的散射特性。传感器前向模型上的辐射是使用多重散射离散标准辐射传递（DISORT）包的定制实现来计算的。 DISORT的实施包括从着陆和轨道大气观测中得出的火星大气平面平行模型，并且能够对有助于观测辐射的所有辐射过程进行建模。 DISORT实现中下边界的反射率由Hapke双向反射率函数与两个参数Henyey-Greenstein散射相位函数结合指定。 Hapke双向反射率与DISORT的集成允许在给定大气和表面双向反射率模型配置以及观察几何形状的情况下，在传感器图像上生成合成Pancam辐射。对于光度数据集中的每个Pancam图像，将生成一个多维辐射查找表，该表跨越必需的几何和模型参数空间。双向反射率模型参数集的优化使用Levenberg-Marquardt非线性最小二乘算法进行，其中迭代辐射正向模型是通过在适当的模型辐射超立方体内通过多线性插值来计算的。建模结果表明，在两个着陆点，单个散射反照率随波长（435、600、750、1005 nm）单调增加，除可见光波长最短以外，MER-A表面的亮度明显高于MER-B表面。除MER-A 435 nm数据外，两个表面反射率模型在所有采样波长下均具有反向散射相位功能。 MER-A散射相位函数显示出更大的反向散射波瓣，而MER-B散射相位函数显示出更大的不对称性。 MER-B模型表面粗糙度的光谱变异性是MER-B着陆点表面耦合的纹理和成分异质性的指标。

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  • 作者

    Seelos, Frank Peter, IV.;

  • 作者单位

    Washington University.;

  • 授予单位 Washington University.;
  • 学科 Geophysics.; Physics Astronomy and Astrophysics.
  • 学位 Ph.D.
  • 年度 2005
  • 页码 164 p.
  • 总页数 164
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 地球物理学;天文学;
  • 关键词

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