嫦娥一号三线阵CCD数据摄影测量处理及全月球数字地形图  

Photogrammetric Processing and Lunar Global Topographic Map form the Chang'E-1 3 Line-array CCD Data

作　　者：李春来[1] 

机构地区：[1]中国科学院国家天文台,北京100012

出　　处：《测绘学报》2013年第6期853-860,868,共9页Acta Geodaetica et Cartographica Sinica

基　　金：国家863计划(2010AA122202);国家自然科学基金(11273037);国防科工局技术基础科研项目(B2920120100)

摘　　要：CCD立体相机是搭载在嫦娥一号探测器上的主要载荷之一,用于获取空间分辨率为120m的前视、正视与后视3个不同视角的月表三线阵遥感影像数据。嫦娥一号共获取1000多轨图像数据,本文筛选其中的628轨影像制作了全月地形数据。采用SIFT特征匹配和最小二乘匹配结合的方法有效解决了月面纹理匮乏、低反照率、低对比度月球影像匹配的技术难题,匹配精度约0.3个像素;采用独立模型区域网平差法解决了CE-1三线阵影像的测区平差、全月球平差、无控制点月面定位等一系列关键技术问题。在此基础上,制作了全月球数字地形图,平面位置精度和高程精度分别为192m(1σ)和120m(1σ)。地形图地形细节表达层次分明、清晰可辨,能清晰分辨出撞击坑底部、撞击坑或山脉侧壁、月海平面等月面地形特征的详细细节。通过比较,全月球数字地形图数据在数据覆盖和完整性、平面位置精度、高程精度、空间分辨率等方面均明显好于国际现有全月球数字地形数据。CCD stereo camera is one of the most important payloads on the lunar orbiter Chang＇E-1, which has been designed to acquire the three-line images with a ground resolution of 120 m per pixel from forward, nadir and backward view directions. Chang＇E-1 has acquired more than 1000 imaging strips. The 628 strips have been selected for produce the lunar global digital topographic map. A combined algorithm with SIFT feature matching and least squares matching has been used and effectively solved the problem because of lunar image with low texture, low albedo and low contrast. The matching accuracy is about 0.3 pixel. Block adjustment by independent models has been used, And three-line block adjustment, global block adjustment, and positioning without GCPs have been solved. Based on this, the lunar global digital topographic map has been generated. The horizontal and vertical accuracy are 192m（1σ） and 120m（1σ） respectively. The terrain has very clear levels of detail. Thegeomorphologic features, such as crater bottom and walls, mountain wails, mare plane, etc, are easily distinguished. By comparison, this global digital topographic map is much better than the existing similar data in terms of the global coverage, the horizontal and vertical accuracies, the ground resolution and so on.

关 键 词：嫦娥一号 CCD立体相机 摄影测量 全月球数字地形图 全月球平差 

分 类 号：P237[天文地球—摄影测量与遥感]