无控制点条件下的PHI影像几何校正

Geometric Correction of PHI Image without Control Point

利用空间位置测量系统对因遥感平台不稳定而引起的影像畸变进行校正是目前航空摄影测量常用的方法。介绍了对推帚成像模式在无地面控制点情况下采集的影像进行几何校正的原理和方法,即利用POS数据解算外方位元素并建立共线方程,从而实现影像的几何校正。用PHI航空遥感影像进行了实验。实验表明,在无地面控制点的情况下,利用POS数据辅助航空摄影测量可快速并较好地去除因遥感平台不稳定引起的影像畸变,校正精度满足影像的实际应用以及大部分比例尺的制图要求。

Using a space position measurement system to correct the image distortion caused by an unstable remote sensing platform is very common in aerial photogrammetry.The principle and method for geometrically correcting the images obtained in pushbroom mode without any ground control point are presented.The geometric correction of the images is implemented by using POS data to calculate azimuth element and by establishing collinearity equations.The method is used for PHI aerial remote sensing images in the experiment.The result shows that in the absence of ground control points,the image distortion caused by the unstable remote sensing platform can be removed quickly with the aided POS data in aerial photogrammetry.The correction accuracy of this method can meet most of the requirements in practical image application and scale mapping.