基于网络/基站RTK移动摄影测量数据的垂向精度分析

丁锐; 李环宇; 张世民; 姜大伟; 刘睿; 李安

doi:10.11899/zzfy20220107

基于网络/基站RTK移动摄影测量数据的垂向精度分析

doi: 10.11899/zzfy20220107

丁锐^{1, 2,},
李环宇³,
张世民²,
姜大伟²,
刘睿²,
李安²

1.
中国地震局地质研究所, 北京 100029
2.
应急管理部国家自然灾害防治研究院, 北京 100085
3.
浙江省地震局, 杭州 310013

基金项目: 国家重点研发计划（2018YFC1504201）；科研院所基本科研业务专项（ZDJ2018-22、ZDJ2017-24、ZDJ2020-12）

详细信息

作者简介:
丁锐，男，生于1982年。助理研究员。主要从事活动构造、构造地貌学研究。E-mail：ruiding@ninhm.ac.cn

2 CloudCompare user manual（Version 2.6.1），2015.
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出版历程
- 收稿日期: 2022-02-07
- 网络出版日期: 2022-05-31
- 刊出日期: 2022-03-31

Analysis of Vertical Accuracy Based on Network/Base Station RTK-SfM Data

1.
Institute of Geology, China Earthquake Administration, Beijing 100029, China
2.
National Institute of Natural Hazards, Ministry of Emergency Management of China, Beijing 100085, China
3.
Zhejiang Earthquake Agency, Hangzhou 310013, China

摘要

摘要: 移动摄影测量技术SfM（Structure from Motion）的发展使活动构造研究中快速获得野外中小区域内高精度DEM数据更便捷，DEM数据精度是目前活动构造与测量领域较关注的问题。本文通过对比非RTK模式无人机摄影测量并结合地面控制点（GCPs）生成的SfM DEM数据与基于RTK移动摄影测量技术获取的RTK-SfM DEM数据差异，重点分析搭载RTK模块的移动摄影测量技术获取的DEM数据在垂向上的精度。数据采集、处理与对比结果表明：在添加地面控制点后的非RTK模式无人机摄影测量生成的DEM数据中，除测量区域边缘照片较少而产生畸变外，大部分地区畸变率较小；基于移动RTK技术摄影测量获取的高程数据畸变率更小，且与非RTK模式无人机摄影结合地面控制点生成的高程数据存在约0.85 m的系统高程误差，减去该误差后，点云对比结果表明二者95%以上的点垂向误差均＜0.05 m；搭载RTK模块的移动摄影测量技术获取的DEM数据在垂向上具有更高的精度，且节省了时间与人工成本。
- 活动构造 /
- 移动摄影测量技术 /
- RTK-SfM DEM /
- 垂向误差 /
- 测量精度
Abstract: The development of Structure from Motion (SfM) technology makes it more convenient to obtain high precision DEM data in small and medium-sized areas quickly in the field of active tectonics research. The accuracy of DEM data is a major concern in the field of active tectonics and surveying. By comparing the SfM DEM data generated by non-RTK model UVA technology combined with ground control point (GCPs) and RTK-SfM DEM data obtained based on RTK SfM technology, this paper focuses on analyzing the vertical accuracy of DEM data obtained by SfM technology equipped with RTK module. The results of data acquisition, processing and comparison show that in the DEM data generated by non-RTK model SfM technology with the GCPs, the distortion rate is small in most areas except the distortion caused by fewer photos at the edge of the measurement area. The DEM data obtained by RTK-SfM has a smaller distortion rate, and the data generated by non-RTK SfM combined with GCPs has a system elevation error of about 0.85 m. After subtracting the system error, the point cloud comparison results show that more than 95% of the vertical errors of both are less than 0.05 m. The DEM data obtained by SfM technology equipped with RTK module has better vertical accuracy and saves time and labor cost.
- Active tectonics /
- SfM technology /
- RTK-SfM DEM /
- Vertical error /
- Accuracy of surveying
注释:

1) 2 CloudCompare user manual（Version 2.6.1），2015.

HTML全文

图 1 SfM摄影测量原理与数据处理流程

Figure 1. SfM principle and data processing flow chart

下载: 全尺寸图片幻灯片

图 2 测量区域及其周围构造

Figure 2. Schematic diagram of the survey area and its surrounding tectonics

下载: 全尺寸图片幻灯片

图 3 测量用无人机及地面控制点采集系统

Figure 3. UAV for surveying and ground control point acquisition system

下载: 全尺寸图片幻灯片

图 4 摄影测量数据处理及成果图

Figure 4. SfM data processing and results

下载: 全尺寸图片幻灯片

图 5 SfM-DEM与RTK-SfM DEM点云对比统计及误差空间分布

Figure 5. Point cloud comparison statistics and error spatial distribution between SFM-DEM and RTK-SFM DEM

下载: 全尺寸图片幻灯片

图 6 基于DEM分析结果与野外调查结果的阶地划分及DGPS测线分布

Figure 6. River terraces division and DGPS lines distribution based on DEM analysis and field investigation

下载: 全尺寸图片幻灯片

图 7 DGPS、SfM DEM、RTK-SfM DEM高程数据对比

Figure 7. Comparison of three elevation data of DGPS, SfM DEM and RTK-SFM DEM

下载: 全尺寸图片幻灯片

图 8 去除系统误差后DGPS数据与2种方式生成的DEM数据之间差值的正态分布

Figure 8. Normal distribution of the difference between DGPS data and DEM generated by the two methods after removing systematic error

下载: 全尺寸图片幻灯片

表 1 初步对比点云转换矩阵数据

Table 1. Preliminary comparison point cloud transformation matrix table

x	y	z	RMS
1.000	0.000	0.000	0.565
−0.000	1.000	0.000	0.509
−0.000	−0.000	1.000	0.851
0.000	0.000	0.000	1.000

下载: 导出CSV

表 2 3种高程数据差值的平均值

Table 2. Average value of difference of three elevation data

测线	DGPS与SfM DEM差值/m	DGPS与RTK-SfM DEM差值/m
河床	0.44648900	1.25817214
T1	0.51727922	1.33264908
T2	0.56253832	1.39865517
T3	0.54695363	1.33524765
T4	0.61002861	1.38761910
T5	0.56203093	1.47095521
平均值	0.540886618	1.36388305

下载: 导出CSV

表 3 去除系统误差后3种高程数据差值平均值与标准差

Table 3. Average difference and standard deviation of three elevation data after removing systematic error

测线	DGPS与SfM DEM差值/m		DGPS与RTK-SfM DEM差值/m
测线	平均值	标准差	平均值	标准差
河床	−0.108 698	0.178 616	−0.096 039	0.158 909
T1	−0.037 377	0.143 255	−0.026 488	0.081 722
T2	0.021 172	0.130 226	0.013 106	0.105 653
T3	−0.033 185	0.189 726	−0.010 624	0.109 698
T4	0.069 141	0.120 677	0.023 736	0.150 740
T5	0.107 072	0.116 793	0.021 144	0.082 876

下载: 导出CSV

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