Study of Lunar Deep Materials using Clementine UV-VIS Data

建立了一种利用克莱门汀号探测器获得的紫外可见光谱数据估算月球深部物质组成的方法。该系统由工作站和光盘转换器组成，可存储近百万张Clementine紫外可见光图像。数据库中的图像数据也可以通过计算机网络远程检索。数据库还允许我们搜索和检查位于不同CD-ROM中的图像。利用我们的数据分析系统，可以根据描述航天器位置和姿态的头文件中列出的信息，计算出图像中每个像素的经纬度，然后可以自动地将多幅图像拼接成一幅大的拼接图，并提取所需的信息。为了从可见光-红外数据中提取组成信息，几何校正，如地形校正和相位角校正 关于我们 勃起非常重要。去年的研究表明，如果利用月球地形数据对反射光谱进行地形校正，则可以在3%的精度内校准反射光谱。我们还表明，相位角（即入射太阳光和月球表面反射光之间的角度）的影响取决于材料和波长，在今年的研究中，我们使用Clementine数据详细研究了相位函数，该数据为我们提供了在不同相位角拍摄的多光谱图像。通过这项研究，我们可以定量地证明相位角的材料和波长依赖性。在相位角为2 °时，Mare和Highland的成分相差达17%，波长从415 nm到7 Sonm相差达10%。通过这些分析方法的改进，可以比以前更可靠地推断成分或空间侵蚀效应。少

We established a method of estimating the composition of the lunar deep interior using the UV-VIS data obtained by the Clementine spacecraft. We also made a data base for the UV-VIS images obtained by the Clementine, This system consists of a workstation and a CD-ROM changer which is loaded with about one million Clemetine images. The image data in the data base can be retrieved remotely too through computer network. The data base also allows us to search and inspect the images located in different CD-ROMs. With our data analysis system, we can calculate the latitude and longitude of each pixel in an image using the information listed in the header file which describes the position and attitude of the spacecraft, and then we can automatically assemble many images to make a large mosaic and extract the required information.In order to extract information of the composition from the visible-infrared data, geometrical corrections such as those of topographic correction and phase angle cor … More rection are very important. The study made in the last year showed that we can calibrate the reflection spectra within 3% accuracy if the topographic correction on the reflection spectra is made using the lunar topographic data. We also showed that the effect of the phase angle (i.e. angle between the impinging solar light and reflecting light from the lunar surface) depend on the material and wavelength, In this year's study, we investigated in detail on the phase function using the Clementine data which gives us the multi-spectrum images taken at different phase angles. Through this study, we can demonstrate quantitatively the material and wave-length dependence of the phase angle. The compositional difference between Mare and Highland amounts to the difference of phase function of 17% at a phase angle of 2 deg, and the wavelength difference from 415nm to 7Sonm amounts to 10% at the same condition. From these improvement of analysis method, it has become possible to infer the composition or space erosion effect more reliably than before. Less