机载高光谱CASI/SASI数据几何校正及精度评定

机载高光谱具有高光谱分辨率和高空间分辨率的特点,展现出了独特的优势。机载高光谱数据的几何校正精度,直接影响着数据能否正常使用,是数据预处理中的关键问题。传统的空中三角测量技术必须依靠地面控制点才可以解算影像的外方位元素,工作量大,而且在无法测量地面控制点的区域不能使用。本文在分析CASI/SASI系统几何校正原理的基础上,结合POS AV系统,设计了一套几何检校方案;检验结果表明,在测区范围内无地面控制点的情况下,利用检校场飞行解算的相关数据,CASI/SASI高光谱数据的几何精度达到了要求。

Geometric calibration accuracy evaluation of airborne hyper spectral CASI/SASI data

Airborne hyper spectral data are superior both in spectral resolution and spatial resolution. However they must be calibrated and the calibration accuracy directly influences normal use of the data. Accuracy is the key to the data procession. Traditional aerial triangulation techniques must rely on ground control points to solve external azimuth elements with very workload and dose not work without control points measured. Geometric calibration principle of CASI/SASI system is analyzed. Combined with POS AV system the principle is used to design a set of geometric check and calibration scheme. Implementation of the scheme show that geometric accuracy of CASI/SASI hyper spectral data resolved with relevant data of flight calculation in the inspection field without ground control points in the study area meet the requirements