Universal algorithm for water depth refraction correction in through-water stereo remote sensing
Universal algorithm for water depth refraction correction in through-water stereo remote sensing
复制标题
DOI：
10.1016/j.jag.2020.102108
复制
发表时间：
2020-09-01
影响因子：
7.5
通讯作者：
Zhu, Shulong
中科院分区：
文献类型：
--
作者：
Cao, Bin;Deng, Ruru;Zhu, Shulong
在透水立体遥感中，光线折射对水深测量影响的校正是一个尚未解决的问题。挑战在于，当共辄图像射线不相交时，不存在针对视在位置的解决方案。提出了一种新的透水立体遥感水深折射校正算法。以两条不相交的共轭像射线间最短线段的中点作为视位置，从而在“无解条件”下建立了视深度与实际深度之间的数学关系。无论共轭像线是否相交，新算法都是合理的，适用性强。与现有算法相比，新算法可以不同程度地提高水深精度。随着离天底视角差和深度的增加，改善变得更加显著。1区的结果表明，与现有的三种算法相比，新算法的RMSE准确度分别提高了约22%、29%和24%。新算法能在任何情况下（无论共轭像射线是否相交）实现合理的水深折射校正。
In through-water stereo remote sensing, the correction of the effect of light refraction on water depth determination is an unsolved problem. The challenge is that no solution exists for apparent positions when the conjugate image rays are non-intersecting. This paper proposes a new water depth refraction correction algorithm for through-water stereo remote sensing. The midpoint of the shortest line segment between two non-intersecting conjugate image rays is used as the apparent position, so that the mathematical relationship between the apparent and actual depths is established under the "no solution condition". The new algorithm is reasonable and applicable whether or not conjugate image rays are intersecting. Compared with the existing algorithms, the new algorithm can improve bathymetric accuracy in different degrees. The improvement becomes more significant as the off-nadir view angle difference and the depth increase. Results for Area 1 showed that, compared with the three existing algorithms, the new algorithm improved RMSE accuracy by about 22%, 29% and 24% respectively. The new algorithm enables reasonable water depth refraction correction to be implemented in any case (whether conjugate image rays are intersecting or not).