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| 嫦娥一号IIM高光谱数据和月球轨道器LOLA DEM数据的配准与月表地形校正及评价 | |
| 引用本文： | 马明亮,王超,施润和,高炜. 嫦娥一号IIM高光谱数据和月球轨道器LOLA DEM数据的配准与月表地形校正及评价[J]. 地球信息科学学报, 2015, 17(1): 118-125. DOI: 10.3724/SP.J.1047.2015.00118 |
| 作者姓名： | 马明亮 王超 施润和 高炜 |
| 作者单位： | 1. 华东师范大学地理信息科学教育部重点实验室,上海 2002412. 华东师范大学环境遥感与数据同化联合实验室,上海 2002413. 华东师范大学教育部深空探测联合研究中心数据应用系统分中心,上海 2000624. Department of Ecosystem Science and Sustainability, Colorado State University, Fort Collins 80532, USA |
| 基金项目： | 国家自然科学基金项目(41201358)；上海市科委重点支撑项目(13231203804)；地理信息科学教育部重点实验室主任基金。 |
| 摘 要： | 在对月探测中,月表物质的可见光、近红外反射数据,是进行月表化学元素及矿物反演与制图的重要信息源。受月球表面地形起伏的影响,嫦娥一号干涉成像光谱仪（IIM）高光谱数据在开展月表参数定量反演前,须进行月表地形校正,还原月表真实的反射率信息。IIM高光谱数据和常用的美国LOLA月球DEM数据之间存在月球经纬度空间配准不精确的问题,对月表地形校正的精度产生了影响。以月表陨石坑为例,在两幅月球遥感影像上选取一定数量的同名点,使用多项式校正方法进行像元级配准,与直接使用经纬度开展空间配准作了对比分析,发现IIM高光谱数据与LOLA DEM数据之间在经度方向存在平均约3.5个像元的位置偏差,纬度方向存在约1.95个像元的偏差。在此基础上,尝试将地球地形校正中使用的C校正方法运用到月球,探究在微弱大气散射环境下,月球陨石坑地貌的月表地形校正可行性。研究发现,经过像元级空间配准的数据在月表地形校正的效果上,比直接使用月球经纬度进行匹配的校正效果有明显提高。经过匹配和C校正,月表反射率与太阳入射角的余弦值之间的线性相关方程的斜率降低了89.4%,很好地消除月表陨石坑阴影地区和阳坡高亮区域的月表地形效应,恢复月表阴影区域的光谱信息。验证结果表明,校正后的月表局部遥感影像更接近于月表真实反射率,为后续利用IIM数据开展月表理化要素定量反演研究提供了可靠的科学数据保障。 |
| 关 键 词： | 嫦娥一号 干涉成像光谱仪（IIM） 月球轨道器激光测高仪（LOLA） 地理配准 C校正 地形校正 |
| 收稿时间： | 2014-07-09 |
The Research and Assessment of Topographic Registration and Correction of Chang’E-1 IIM Data Based on LRO LOLA DEM Data |
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| MA Mingliang,WANG Chao,SHI Runhe,GAO Wei. The Research and Assessment of Topographic Registration and Correction of Chang’E-1 IIM Data Based on LRO LOLA DEM Data[J]. Geo-information Science, 2015, 17(1): 118-125. DOI: 10.3724/SP.J.1047.2015.00118 | |
| Authors: | MA Mingliang WANG Chao SHI Runhe GAO Wei |
| Affiliation: | 1. Key Laboratory of Geographical Information Science, Ministry of Education, East China Normal University, Shanghai 200241, China2. Joint Laboratory for Environmental Remote Sensing and Data Assimilation, ECNU and CEODE, Shanghai 200241, China3. Branch of Data Application System, Center of Space Exploration, Ministry of Education, East China Normal University, Shanghai 200062, China4. Department of Ecosystem Science and Sustainability, Colorado State University, Fort Collins 80532, USA |
| Abstract: | The characteristics of the visible and near-infrared reflectance from lunar surface are key information for the inversion and mapping of chemical elements in lunar exploration. Due to the dimply topography, hyperspectral dataobtained from IIM should be introduced with topographic correction before the application of practical inversion to get the actual reflectivity information. There ported longitudes and latitudes of the IIM data generally did not match with the conventional data from the LOLA DEM. Consequently, the accuracy of the topographic correction might be affected and decreased. In this paper, a case study was done related to the lunar crater. More specifically, a certain number of ground control points in a crater with same characteristic were selected for both images to match the IIM data and LOLA DEM data. The results from polynomial correction method were different from the correction results calculated directly from lunar longitude and latitude. There was approximately 3.5 pixels’ offset in the direction of longitude and about 1.95 pixels’ offset in the direction of latitude between IIM data and LOLA DEM data. The conventional topographical correction used on earth (i.e. C correction method) was introduced for a possible topographical correction on the moon, where there is almost no atmosphere scattering. The results showed that the performance of the matched topographical correction data was much better than those from unmatched data. After the application of registration and C correction, the slope of the linear correlation equation between the incident angle cosine value and the reflectance was reduced by 89.4 percent, the terrain effects of the shadow area and the highlight area on the lunar surface was eliminated. We concluded that the actual reflectivity information from lunar surface could be closely assessed after applying registration and topographic correction to IIM data, which could provide a sound basis for the inversion of chemical elements and minerals based on IIM data. |
| Keywords: | Chang’E-1 IIM LOLA registration C Correction topographic correction |
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