基于实验室、就位及轨道数据的嫦娥3号和4号着陆区光度学研究

可见-近红外反射光谱是获取月表成分最为有效的手段之一，充分解译目前积累的大量月球反射光谱数据，对理解月球表面的物质组成和演化历史具有重要意义。然而，观测几何角度的差异会影响光谱数据的准确解译，因此需要结合详细的光度学研究作为基础。利用控制性实验研究可以对常用光谱/光度模型进行检验，利用轨道遥测数据可以对月表进行大范围的普查，但是实验研究与轨道遥测分析结果之间往往难以进行直接的对比。基于此，本项申请拟以嫦娥3号和4号着陆区为切入点，综合实验室控制性光度测量、嫦娥3/4号月表原位探测与月球轨道遥测光度学数据，对着陆区进行多尺度的光度学对比研究，对如何提高反射光谱光度校正、光度学参数解译及光谱解混的准确度进行针对性分析。该工作将1) 为原位与遥测光度数据解译提供详实的实验依据；2) 为轨道遥测光谱/光度数据的解译构建严格的月面参考基准点，以提高遥测数据的解译准确度。

Visible and near-infrared reflectance spectroscopy is one of the most effective means to obtain mineralogy of the lunar surface. Analysis and interpretation of the large amount of spectral data from both the past and the ongoing missions is important for understanding the lunar surface materials and the evolution history of the Moon. However, the difference in the measurement geometric configuration will affect the accuracy of spectral interpretation, and hence it is essential to perform detailed photometric studies to understand the view geometry effects on the spectra. Controlled laboratory studies can help to validate the commonly used spectral and photometric models, whereas orbital remote sensing data can be used to conduct a larger-scale investigation of the spectral and photometric properties of the lunar surface. However, it is difficult to compare the laboratory results with those from orbital remote sensing analysis. To account for this, this project will take advantage of in situ measurements from Chang’E 3 and 4 mission, combing the photometric data obtained through controlled laboratory measurements and the orbital remote sensing observations, to carry out a comprehensive photometric study of the landing sites of Chang’E 3 and 4. The objectives of this work include 1) providing a detailed experimental basis for the interpretations of the photometric data from in situ and remote sensing observations; 2) using in situ data as a calibration point to improve accuracy of the interpretation of the remote sensing data.