1.湖北珞珈实验室,湖北 武汉,430079
2.中国地质大学(武汉)计算机学院,湖北 武汉,430074
3.中国地质大学(武汉)地理与信息工程学院,湖北 武汉,430074
谌一夫,博士,副教授,研究方向为卫星遥感对地观测、激光海洋测量、遥感信息工程。stein_syf@foxmail.com
张东方,博士。zhangdongfang@cug.edu.cn
收稿:2023-03-09,
纸质出版:2025-01-05
移动端阅览
谌一夫,李帅,张东方,等.自适应空间密度滤波的ICESat‑2激光雷达测深[J].武汉大学学报(信息科学版),2025,50(1):83-96.
CHEN Yifu,LI Shuai,ZHANG Dongfang,et al.ICESat‑2 LiDAR Bathymetry Based on Adaptive Spatial Density Filtering[J].Geomatics and Information Science of Wuhan University,2025,50(1):83-96.
谌一夫,李帅,张东方,等.自适应空间密度滤波的ICESat‑2激光雷达测深[J].武汉大学学报(信息科学版),2025,50(1):83-96. DOI:,10.13203/j.whugis20220453
CHEN Yifu,LI Shuai,ZHANG Dongfang,et al.ICESat‑2 LiDAR Bathymetry Based on Adaptive Spatial Density Filtering[J].Geomatics and Information Science of Wuhan University,2025,50(1):83-96. DOI:,10.13203/j.whugis20220453
冰、云和陆地高程卫星2号(ice
cloud and land elevation satellite-2
ICESat-2)搭载了先进地形激光测高系统(advanced topographic laser altimeter system,ATLAS),该系统采用光子计数探测模式,可获取高精度的地表高程信息。ATLAS使用532 nm波段激光器,具备一定的水深探测能力,为星载数据近岸水深探测提供了新手段。利用ICESat-2 ATLAS数据进行测深,关键问题是如何实现不同区域、不同环境、不同密度分布条件下信号光子的自动探测与提取。为解决此问题,提出了一种基于自适应空间滤波的ICESat-2数据测深方法,该方法首先将水面以上、水面和水下区域的原始光子进行分离,随后基于可变椭圆密度滤波核精确提取水面与水底光子,椭圆密度滤波核参数根据不同水深下光子密度的分布特点自适应确定,最终实现浅海水深测量。实验结果表明,所提方法获取的ICESat-2测深结果与机载激光雷达测深结果的相关系数达到0.93,均方根误差为0.51 m,具有较高的测深精度。
Objectives
2
The ice
cloud
and land elevation satellite-2 (ICESat-2)
equipped with the advanced topographic laser altimeter system (ATLAS)
is a new measurement strategy with a photon-counting technique to obtain the high-accuracy elevation information in the surface of the Earth. ATLAS uses a 532 nm band laser to emit three pairs of scanning laser beams
each pair containing one strong and one weak sub-beam. The receiver collects millions of return photons from the echo
and each received photon is recorded. In the field of bathymetry
photon counting LiDAR has great advantages. For traditional LiDAR with linear detection regime
the only way to achieve high signal-to-noise ratio requirement is to increase the emitted laser energy
which results in a very bulky and huge system and high design power consumption. Photon counting LiDAR is no longer confined to the detection of clear high signal-to-noise ratio echo waveform. It uses statistical optics theory to achieve effective ranging
and maximizes the use of each photon energy in the laser echo
which can greatly improve the detection efficiency of bathymetry detection while reducing the system complexity
providing new opportunities for near-shore bathymetry detection. Based on ICESat-2 ATLAS data for bathymetry
the main problem is how to achieve automatic detection and extraction of signal photons for raw photons in different regions
different environments and different density distributions.
Methods
2
To overcome these existing problems
an adaptive spatial filtering bathymetric method based on photon density distribution is proposed. The method first separate the photons into above the water
water-surface
and underwater photons. The filter parameters can be automatically determined by the photon density distribution generated based on the optical characteristics of different water bodies and water depth distribution
so that the signal photons of the water surface and bottom can be precisely extracted to achieve bathymetry. In order to verify the bathymetric accuracy of the method
experiments were conducted using ATLAS datasets obtained in different areas of the South China Sea
and finally the experimental results were verified by using high-precision bathymetric data acquired by airborne LiDAR.
Results
2
The validation results show that the coefficient of determination between the ICESat-2 bathymetric results and the airborne LiDAR bathymetric results reaches 0.93
and the correspond root mean square error is 0.51 m
which illustrate the bathymetric potential of the method proposed in this research. In addition
when using photonic data for bathymetry
it is influenced by the refraction of the water body
which mainly exists in the vertical direction and increases with the increase of depth.
Conclusions
2
Due to the complex diversity of water body environment
the photon bathymetry accuracy will show a certain decreasing trend with the increase of water depth. In future research
bathymetric experiments will be conducted using the method of this paper and the ATLAS dataset to investigate a more accurate refraction correction model in order to explore the bathymetric potential of the satellite-based photon counting LiDAR in different water environments.
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