袁修孝1 傅建红1 左正立2 孙红星1
(1武汉大学遥感信息工程学院,武汉市珞喻路129号,430079) (2中国科学院遥感应用研究所,北京市朝阳区大屯路3号.100101)
摘 要:利用实际航摄资料评价了WGS 84和国家80坐标系下机载POS(position and ofientation system)系 统直接对地目标定位的精度,分析了不同大地水准面拟合方法对高程精度的影响,检校了POS系统的视准轴 误差,讨论了检校场的检校结果。试验表明,基于POS系统的航空遥感直接对地目标定位至少需要利用带有 1个平高地面控制点的检校场对POS系统进行检校才能消除系统误差;在WGS84坐标系中,可以获得较高 的定位精度,而转换到国家80坐标系下,必须对高程进行大地水准面拟合改正。 关键词:POS系统;目标定位;高程拟合;精度 中图法分类号:P231.2;P237.9
Accuracy Analysis of Direct Georeferencing by Airborne Position and Orientation System in Aerial Photogrammetry
YUAN Xiuxiao1 FU Jianhong1 ZUO Zhengli2 SUN Hongxing1
(1 School of Remote Sensing and Information Engineering, Wuhan University, 129 Luoyu Road, Wuhan 430079, China) (2 Institute of Remote Sensing Applications, Chinese Academy of Sciences, 3 Datun Road, Beijing 100101, China)Abstract: The accuracy of direct georeferencing by airborne position and orientation system(POS) in WGS 84 coordinate system and in 80 Xi' an geodetic coordinate system is ap-praised, the height accuracy by using different geoid simulate methods is analyzed, the bore-sight angle errors of POS system are calibrated and the calibration results in different testfields are discussed. The empirical results have verified that direct georeferencing of aerialphotogrammetry based on POS system requires a calibration field with at least 1 XYZ groundcontrol point to eliminate system errors. The accuracy of direct georeferencing is very goodin WGS 84 coordinate system. However, it is necessary for getting accurate 3D coordinatesof the photogrammetric points to correct height by using geoid simulate in 80 ' geodetic coor-dinate system.
Key words: POS; object positioning; height fitting; accuracy
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