Wong Un-Hong, Wu Yunzhao, Wong Hon-Cheng, Liang Yanyan, Tang Zesheng
Space Science Institute, Macau University of Science and Technology, Macao, China.
School of Geographic and Oceanographic Sciences, Nanjing University, Nanjing 210093, China.
ScientificWorldJournal. 2014 Jan 12;2014:457138. doi: 10.1155/2014/457138. eCollection 2014.
In this paper, we model the reflectance of the lunar regolith by a new method combining Monte Carlo ray tracing and Hapke's model. The existing modeling methods exploit either a radiative transfer model or a geometric optical model. However, the measured data from an Interference Imaging spectrometer (IIM) on an orbiter were affected not only by the composition of minerals but also by the environmental factors. These factors cannot be well addressed by a single model alone. Our method implemented Monte Carlo ray tracing for simulating the large-scale effects such as the reflection of topography of the lunar soil and Hapke's model for calculating the reflection intensity of the internal scattering effects of particles of the lunar soil. Therefore, both the large-scale and microscale effects are considered in our method, providing a more accurate modeling of the reflectance of the lunar regolith. Simulation results using the Lunar Soil Characterization Consortium (LSCC) data and Chang'E-1 elevation map show that our method is effective and useful. We have also applied our method to Chang'E-1 IIM data for removing the influence of lunar topography to the reflectance of the lunar soil and to generate more realistic visualizations of the lunar surface.
在本文中，我们通过结合蒙特卡罗射线追踪和哈普克模型的新方法对月壤的反射率进行建模。现有的建模方法要么采用辐射传输模型，要么采用几何光学模型。然而，轨道飞行器上的干涉成像光谱仪（IIM）测得的数据不仅受矿物成分影响，还受环境因素影响。这些因素无法仅通过单一模型得到很好的解决。我们的方法采用蒙特卡罗射线追踪来模拟诸如月球土壤地形反射等大规模效应，并采用哈普克模型来计算月球土壤颗粒内部散射效应的反射强度。因此，我们的方法同时考虑了大规模和微观尺度效应，能更准确地对月壤反射率进行建模。使用月球土壤特性协会（LSCC）数据和嫦娥一号高程图的模拟结果表明，我们的方法是有效且有用的。我们还将我们的方法应用于嫦娥一号IIM数据，以消除月球地形对月球土壤反射率的影响，并生成更逼真的月球表面可视化图像。
