Study On The Terrain Shadow Influencing On The Lunar Surface Brightness Temperature

Recently interest in remote sensing with microwave sensors has attracted attention to the China's lunar exploration project. As one of the four scientific objectives of Chang'E Lunar Orbite (CE-1), inversion of the thickness of lunar regolith, which is derived from the microwave brightness-temperature (TB) measurements of the entire lunar surface, is the highlight of our lunar exploration. And then, surveying the global evaluation of 3He content is another purpose of further. Many theoretical models have been developed to simulate the scientific sensed data obtained form spaceborne radiometers. These physical model results and data have manifested the passive sensors are sensitive to these parameters: the lunar regolith layer thickness and its stratified structures, lunar surface and subsurface temperatures, and FeO+TiO2 content.In the paper, the specific variation of TB on some certain districts are researched, in combination with optical image information, taking the influence of rough surface shadowing into account including the parameters mentioned earlier. Using image binaryzation, the given region is simply divided into two parts: areas of high brightness and areas of low brightness. This shadowing effect can be incorporated into the three-layer model by introducting CCD gray gradient in this study. We wish to demonstrate that the level of work necessary to incorporate optical shadowing into these models is justified by potential benefits and take some initial steps toward its realization.