以DEM為高程控制之弱交會幾何衛星影像區域平差

DEM Controlled Block Adjustment for Satellite Images with Weak Converging Geometry

陳良健(Liang-Chien Chen) ； 仝宜中(Yi-Chung Tung)

《航測及遙測學刊》 12卷1期 (2007/03) Pp. 17-35

https://doi.org/10.6574/JPRS.2007.12(1).2

摘要

資源衛星之主要用途為環境監測及資源探測，為求較大的影像覆蓋面積，通常不同軌道的影像重疊區域很小，且航帶間普遍具有較弱的交會幾何，傳統上以三維定位為考量之光束法平差模式將不適用。本研究將提出一個新的光束法平差程序，針對弱交會幾何之衛星影像，以數值高程模型作為航帶連結點之高程控制進行光束法平差，藉以降低重疊航帶間共軛點之相對偏移，並改善正射影像間銜接之品質。主要工作包括：(1)以光束法區域平差搭配數值高程模型作為高程控制進行影像方位之重建，(2)進行衛星影像正射化，及(3)正射影像鑲嵌。實驗結果顯示，加入航帶連結點進行光束法區域平差，能有效降低重疊航帶間共軛點之相對偏移，並減少鑲嵌影像上重疊區影像錯開之現象。

關鍵字

光束法平差 ； 數值高程模型 ； 影像正射化

並列摘要

The major applications of the remote sensing images include the detection of natural resources and the monitoring for geoenvironment. In order to acquire largest possible coverage, the overlapping area of satellite images is small in general. In addition, the converging geometry is poor in common. Hence, the traditional 3-D bundle adjustment is not suitable for orientation modeling directly. The objective of this investigation is to propose a modified block adjustment procedure using DEMs as elevation control for multi-orbit satellite images. The major works of the proposed scheme are: (1) bundle adjustment using DEM as an elevation control, (2) generation of the orthophotos, (3) image mosaicking. Experimental results indicate that block adjustment can reduce the discrepancies for conjugate points between image strips. It is also demonstrated that the mosaicked image is better seamed when tie points are employed in the adjustment.

並列關鍵字

Bundle Adjustment ； Digital Elevation Model ； Orthorectification