| 不同地形条件下的AW3D30、SRTM3和ASTER GDEM高程精度分析 |
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| 引用本文： | 魏德宏,崔家武.不同地形条件下的AW3D30、SRTM3和ASTER GDEM高程精度分析[J].广东工业大学学报,2021,38(3):91-96. |
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| 作者姓名： | 魏德宏 崔家武 |
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| 作者单位： | 1. 广东工业大学 土木与交通工程学院，广东 广州 510006;2. 广州市城市规划勘测设计研究院，广东 广州 510060 |
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| 基金项目： | 国家自然科学基金资助项目(41674006) |
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| 摘 要： | 以广东部分山地丘陵为研究区域, 分析了数字高程模型AW3D30、SRTM3 V4.1和ASTER GDEM V3的高程精度。利用车载动态PPP技术对沿广州、惠州、韶关、清远约730 km的线路进行了数据采集, 并由CSRS-PPP定位服务系统解算得到动态点的WGS84坐标, 再通过重力场模型EIGEN-6C4将动态点的大地高转换为正常高, 最后对3种数字高程模型进行高程检核。结果表明: AW3D30、SRTM3 V4.1和ASTER GDEM V3的平均误差分别为0.55、0.17、1.59 m, 均方根误差分别为3.78、5.84、8.88 m。3种数字高程模型的平均误差在不同海拔区间差异明显, 其中AW3D30在不同海拔区间的平均误差振幅相对较小, 在2.18 m以内; SRTM3 V4.1的平均误差与海拔为负相关关系, 平均误差随着海拔的升高由正值逐渐转为负值; ASTER GDEM V3的平均误差在(0 m, 250 m]海拔区间为2 m左右, 在(250 m, 800 m]区间为-2.28 m。AW3D30的均方根误差与标准差整体上随着海拔的升高而减小, SRTM3 V4.1随着海拔的升高而增大, ASTER GDEM V3无显著规律, 在(100 m, 250 m]区间优于7.69 m, 在其余区间优于9.86 m。
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| 关 键 词： | 数字高程模型 动态PPP技术 EIGEN-6C4 高程精度 海拔区间 |
| 收稿时间： | 2020-11-20 |
An Elevation Accuracy Analysis of AW3D30, SRTM3 and ASTER GDEM under Different Terrain Conditions |
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| Wei De-hong,Cui Jia-wu.An Elevation Accuracy Analysis of AW3D30, SRTM3 and ASTER GDEM under Different Terrain Conditions[J].Journal of Guangdong University of Technology,2021,38(3):91-96. |
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| Authors: | Wei De-hong Cui Jia-wu |
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| Affiliation: | 1. School of Civil and Transportation Engineering, Guangdong University of Technology, Guangzhou 510006, China;2. Guangzhou Urban Planning & Design Survey Research Institute, Guangzhou 510060, China |
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| Abstract: | The elevation accuracy of AW3D30 SRTM3 v4.1 and ASTER GDEM V3 are analyzed through the area of the mountainous hills in parts of Guangdong. The data of 730 km lines along Guangzhou, Huizhou, Shaoguan and Qingyuan are collected by vehicle dynamic PPP, the WGS84 coordinates of dynamic points calculated by CSRS-PPP positioning service system, geodetic height of dynamic points converted into normal height by gravity field model EIGEN-6C4, and finally, the elevation of three digital elevation models are checked. The results show that the average errors of AW3D30, SRTM3 v4.1 and ASTER GDEM V3 are, respectively, 0.55, 0.17 and 1.59 m, and the root mean square 3.78, 5.84 and 8.88 m. The average error amplitude of AW3D30 in different altitudes is relatively small, within 2.18 m; the average error of SRTM3 v4.1 has a negative correlation with altitude, and the average error gradually changes from positive value to negative value with the increase of altitude; the average error of ASTER GDEM V3 is within (0 m, 2.18 m] altitude range and is about 2 m and -2.28 m in (250 m, 800 m] range. The root mean square error and standard deviation of AW3D30 decrease with the increase of altitude, while SRTM3 v4.1 increases with the increase of altitude. ASTER GDEM V3 has no significant rule, which is better than 7.69 m in (100 m, 250 m], and better than 9.86 m in other regions. |
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| Keywords: | digital elevation model dynamic PPP EIGEN-6C4 elevation accuracy altitude range |
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