控制点精度对遥感影像几何校正的影响

Effect of Precision of Control Points on Geometric Correction of Remote Sensing Image

该项研究以唐山市路南区、路北区为研究区域,利用ENVI软件进行几何校正精度研究;以地形图选取的地面控制点、手持GPS野外采集的控制点及GPSRTK测量控制点等方式,研究其数据精度对遥感数据几何校正的精度影响;利用点位误差模型和距离模型,对影像数据处理前后获取的精度进行对比,总结遥感影像数据几何精度和地面分辨率两者之间的关系;利用ENVI软件对3种遥感影像数据进行几何精度校正、精度评定。研究结果表明,遥感影像几何校正精度和地面分辨率呈正相关关系;随着选取地面控制点精度的提高,高分辨率影像几何校正精度也会得到相应提高,而中低分辨率的遥感影像几何校正精度提高程度并不明显。

Geometric correction precision was studied by using ENVI software in Luannan and Lubei Districts of Tangshan City.The geodesic control points selected by topographic map,GPS field control points and GPSRTK measurement control points.The accuracy of the correction was analyzed.The relationship between the geometric accuracy and the ground resolution of the remote sensing image data was compared by using the point error model and the distance model.The relationship between the geometric accuracy and the ground resolution of the remote sensing image data was summarized.Three kinds of remote sensing images Data for geometric accuracy correction,accuracy assessment.The results show that the geometric correction accuracy of the remote sensing image is positively correlated with the ground resolution.With the improvement of the precision of the ground control point,the accuracy of the geometric correction of the high resolution image will be improved,and the accuracy of the geometric correction of the low resolution remote sensing image is not obvious.