以重心坐标为基准的空间后方交会非迭代法

为解决基于迭代的空间后方交会算法在倾斜摄影中可能出现的不收敛现象,提出了一种以重心坐标为基准的非迭代解算方法。首先将控制点物方空间坐标描述成重心坐标,并基于其坐标参考无关性,采用总体最小二乘方法求出对应像方空间坐标,然后通过正交矩阵方法进行绝对定向并优化。试验结果表明,该方法几乎对任意影像姿态均能正确解算,并且精度达到甚至优于基于迭代的空间后方交会方法。

A Non-iterative Space Resection Method Based on Barycentric Coordinates

To resolve the problem that iterative space resection algorithms may have no convergence in oblique photogrammetry,a novel non-iterative method based on barycentric coordinates is proposed.This algorithm firstly describes the object space coordinates of control points as barycentric coordinates,based on its coordinate reference independence,the corresponding image space coordinates can be obtained by using total least square method,then absolute orientation using orthonormal matrices is applied and the result is optimized finally.Experimental results show that this algorithm can be suitable for any image attitude angle,and the accuracy is even better than iterative space resection methods.