DEM-Assisted RFM Block Adjustment of Pushbroom Nadir Viewing HRS Imagery
DEM-Assisted RFM Block Adjustment of Pushbroom Nadir Viewing HRS Imagery
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DEM 辅助 RFM 块平差推扫式天底查看 HRS 图像
DOI：
10.1109/tgrs.2015.2472498
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发表时间：
2016-02
影响因子：
8.2
通讯作者：
Ling Xiao
中科院分区：
文献类型：
--
作者：
Zhang Yongjun;Wan Yi;Huang Xinhui;Ling Xiao
天底观测卫星影像是生成正射镶嵌图的有效数据源。由于卫星影像的地理参考误差，区域网平差是大面积正射影像生成的第一步。然而，最低点观测图像的相邻轨道的几何关系不够刚性。本文提出了一种新的有理函数模型（RFM）区域网平差方法，该方法通过约束联络点高程来提高相对几何刚度。通过对数字高程模型（DEM）中连接点的高程进行插值，并对插值高程的先验误差进行估计，获得了较好的整体相对精度，避免了局部最优解问题。根据RFM的先验误差约束调整后的模型参数，实现了无地面控制点区域网平差。利用多重反投影法对连接点的物空间位置进行优化初始化，减少了区域网平差所需的迭代次数。利用46幅资源三号遥感影像、1：5万DEM和586个地面控制点进行了验证。与Teo的约束联络点水平坐标和高程的方法相比，当控制点稀疏时，本文方法收敛速度更快，且绝对和相对精度基本相同。仅用4个控制点的区域网平差结果表明，试验区未发生精度退化，独立检查点的均方根误差达到1.5个地面分辨率左右。利用不同的DEM和连接点数来研究这些因素对区域网平差结果的影响。结果表明，当影像侧倾角较大时，DEM精度越高，连接点越密集，精度越高。所提出的方法也进行了测试，5118 IKONOS-2图像，覆盖南欧无GCP。实验结果表明，该方法的相对拼接精度明显优于Grodecki方法。
Nadir viewing satellite image is an effective data source to generate orthomosaics. Because of the georeferencing error of satellite images, block adjustment is the first step of orthomosaic generation over a large area. However, the geometric relationship of the neighboring orbits of the nadir viewing images is not rigid enough. This paper proposes a new rational function model (RFM) block adjustment approach that constrains the tie point elevation to enhance the relative geometric rigidity. By interpolating the elevations of tie points in a digital elevation model (DEM) and estimating the a priori errors of the interpolated elevations, better overall relative accuracy is obtained, and the local optimal solution problem is avoided. By constraining the adjusted model parameters according to the a priori error of RFMs, block adjustment without ground control point (GCP) is performed. By optimal initializing the object-space positions of tie points with multi-backprojection method, the needed iteration times of block adjustment are reduced. The proposed approach is investigated with 46 Ziyuan-3 sensor-corrected images, a 1:50 000 scale DEM, and 586 GCPs. Compared with Teo's approach that constrains the horizontal coordinates and elevations of tie points, the approach in this paper converges much faster when the GCPs are sparse, and meanwhile, the absolute and relative accuracy of the two approaches are almost the same. The result of block adjustment with only four GCPs shows that no accuracy degeneration occurred in the test area and the root-mean-square error of independent check point reaches about 1.5 ground resolutions. Different DEMs and number of tie points are used to investigate whether the block adjustment result is influenced by these factors. The results show that better DEM accuracy and denser tie points do improve the accuracy when the images have large side-sway angles. The proposed approach is also tested with 5118 IKONOS-2 images that cover the southern Europe without GCP. The result shows that the relative mosaicking accuracy is much better than that of Grodecki's approach.
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DOI：
10.1111/phor.12078
发表时间：
2014-12
期刊：
The Photogrammetric Record
影响因子：
--
作者：
Yongjun Zhang;Bo Wang;Zuxun Zhang;Y. Duan;Yong Zhang;Mingwei Sun;Shunping Ji
通讯作者：
Yongjun Zhang;Bo Wang;Zuxun Zhang;Y. Duan;Yong Zhang;Mingwei Sun;Shunping Ji
影响因子：
8.2
作者：
Yongjun Zhang;M. Zheng;Jinxin Xiong;Yihui Lu;Xiaodong Xiong
通讯作者：
Yongjun Zhang;M. Zheng;Jinxin Xiong;Yihui Lu;Xiaodong Xiong
影响因子：
1.3
作者：
Wang, Taoyang;Zhang, Guo;Zhu, Xiaoyong
通讯作者：
Zhu, Xiaoyong
影响因子：
1.3
作者：
Y. Sheng
通讯作者：
Y. Sheng
影响因子：
8.2
作者：
T. Toutin
通讯作者：
T. Toutin