野外作业中自然地面控制点对无人机遥感影像精度纠正分析

Accuracy Correction Analysis of UAV Remote Sensing Image by Natural Ground Control Points

无人机遥感影像技术在滑坡、泥石流、地震等自然灾害分析中运用广泛。无人机遥感影像由于无人机镜头的焦距变动、像主点偏移、镜头畸变等问题会导致遥感影像数据存在几何畸变,为提高无人机航拍正射影像的精度,利用几何形态较好的自然地表物体作为地面像控制点,通过对自然地面控制点纠正后的正射影像和数字高程模型进行精度检验试验,其结果表明该方法对于无人机遥感影像精度的纠正具有良好的可行性。

UAV(Unmanned aerial vehicle)remote sensing image technology is widely used in the analy⁃ses of landslide,debris flow,earthquake and other natural disasters.The focal length change,image prin⁃cipal point offset and lens distortion of UAV lens would cause the geometric distortion of remote sensing im⁃age data.In order to improve the accuracy of UAV aerial Orthophoto Image,this paper uses the natural sur⁃face object with good geometric shape as the ground image control point,and carries out accuracy test on the Orthophoto Image and DEM corrected by the natural ground control point.The results showed that the method is feasible for the accuracy correction of UAV remote sensing image.