一种更严密的双介质立体摄影测量折射改正算法

发布时间：2019-02-09 14:44

【摘要】：提出一种更严密的双介质立体摄影测量物方坐标折射改正算法。该算法用水下目标的空中同名直线光线公垂线段的中点作为摄影测量交会点的理论位置,解决了空中同名直线光线延长线不相交情况下摄影测量交会点不存在导致的点位关系不确定性问题,使摄影测量交会点到真实物点的坐标折射改正公式能够严格推导出来。分析了空中同名直线光线不相交情况对物方大地坐标折射改正的不利影响,研究了摄影测量交会点与水下真实物点的相互位置关系,推导了水下目标点的水深和大地坐标计算公式(即折射改正公式),通过WorldView-2立体影像浅海海底地形测量试验对算法的正确性和测量精度进行验证。研究表明,不论水下目标的空中同名直线光线延长线是否相交,该算法都是适用的,且能显著改善水下目标的高程测量精度。
[Abstract]:A more rigorous correction algorithm of square coordinate refraction in stereo photogrammetry with two media is proposed. The algorithm uses the midpoint of the common vertical line of the same name line ray in the air of the target as the theoretical position of the intersection point of photogrammetry. The uncertainty of the point position relationship caused by the non-existence of the intersection point of photogrammetry is solved, and the formula of coordinate refraction correction from the intersection point of photogrammetry to the real point can be deduced strictly. This paper analyzes the adverse effect of the disjoint of the line ray of the same name in the air on the refraction correction of the object square geodetic coordinate, and studies the mutual position relationship between the intersection point of photogrammetry and the underwater real object point. The calculation formulas of depth and geodetic coordinates of underwater target points (i.e. refraction correction formula) are derived. The correctness and accuracy of the algorithm are verified by the WorldView-2 stereoscopic images of shallow sea seabed topographic measurements. The results show that the algorithm is applicable and can improve the accuracy of underwater target elevation measurement, regardless of the intersection of the line extension line of the same name line in the air of underwater target.
【作者单位】：上海海洋大学海洋科学学院;信息工程大学五院;
【基金】：上海市科学技术委员会科研计划(14590502200) 航空遥感技术国家测绘地理信息局重点实验室基金(2016B05)~~
【分类号】：P23

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