Analysis of Diffuse Attenuation Coefficient Spectra of Coastal Waters of Hainan Island and Performance Estimation of Airborne LiDAR Bathymetry
DING Kai1,2, LI Qing-quan1,2*, ZHU Jia-song1,2, WANG Chi-sheng1,2,3*, CUI Yang1,2, GUAN Ming-lei1,2, WANG Dan1,2, FAN Xing4
1. Key Laboratory for Geo-Environment Monitoring of Coastal Zone of the National Administration of Surveying, Mapping and Geoinformation, Shenzhen University, Shenzhen 518060, China
2. Shenzhen Key Laboratory of Spatial Smart Sensing and Services, Shenzhen University, Shenzhen 518060, China
3. Key Laboratory for National Geographic Census and Monitoring, National Administration of Surveying, Mapping and Geoinformation, Wuhan 430079, China
4. Teledyne Optech, Inc, Ontario L4K5Z8, Canada
摘要： 机载激光雷达测深是近年来蓬勃发展的主动式水深测量方法，能够快速精准地获取近岸水深和水下地形，特别是对于浅海、岛礁等船只无法达到的区域具有显著优势。而机载激光雷达系统的测深能力主要受到水体浑浊度的影响。激光测深实验中对实验区域的水体浑浊度研究将有助于实验方案的设计。以中国海南岛沿岸海域为例，研究了该海域水体浑浊度和机载激光雷达测深系统CZMIL(coastal zone mapping and imaging LiDAR)测深能力之间的关系，建立了运用水体漫衰减系数估算机载激光雷达测深系统测深能力的算法。首先分析并确定了实验区域的漫衰减系数Kd(490)反演算法；其次，运用该区域实测光学数据建立了漫衰减系数Kd(490)和Kd(532)之间的数值关系；接着总结了Kd(532)和CZMIL系统最大测深值之间的关系；最后运用MODIS数据合成了海南岛沿岸海域在CZMIL系统海道测量模式下的测深能力空间分布图，重点分析了海口和陵水附近海域的最大可测水深分布情况。为海南岛沿岸海域开展激光测深实验提供了参考和依据。
关键词：海洋光学；漫衰减系数；光谱分析；海南岛；CZMIL；激光测深
Abstract：Airborne LiDAR bathymetry is an active bathymetry method developed in recent years, which can quickly and efficiently obtain the water depth and underwater topography, especially plays an important role in surveying on shallow water and islandreefs where ships are not accessible. In general, the maximum detectable water depth of airborne LiDAR bathymetry systemis mainly affected by the turbidity of water. Therefore, a detailed study of water turbidity of the experimental regionin advance will contribute to design the experimental scheme. In this paper, taking the coastal waters of Hainan Island in South China as an example, we studied the relationship between turbidity of water and the bathymetry performance of an airborne LiDAR bathymetry system named CZMIL (coastal zone mapping and imaging LiDAR), and presented an algorithm that can estimate the spatial distribution of maximum CZMIL detectable water depth in the coastal waters of Hainan Island by using the values of diffuse attenuation coefficient of sea water. Firstly, we studied the Kd(490) inversion algorithm in the experimental water region. Secondly, the relationship between the diffuse attenuation coefficient Kd(490) and Kd(532) was established by using the measured optical profile data in this region. Then, the relationship between the diffuse attenuation coefficient Kd(532) and the maximum CZMIL detectable depth was summarized. Finally, the spatial distribution of Kd(532) and maximum CZMIL detectable depth in the coastal waters of Hainan Island were retrieved by using MODIS data. What’s more, the distribution of maximum CZMIL detectable depth in the coastal waters of Haikou City and Lingshui City are analyzed emphatically. The results provide a reference for the LiDAR bathymetric operation in the coastal waters of Hainan Island.
Key words：Ocean optics；Diffuse attenuation coefficient；Spectral analysis；Hainan Island；Coastal zone mapping and imaging LiDAR；LiDAR bathymetry
丁 凯，李清泉，朱家松，汪驰升，崔 扬，管明雷，王 丹，樊 星. 海南岛沿岸海域水体漫衰减系数光谱分析及LiDAR测深能力估算[J]. 光谱学与光谱分析, 2018, 38(05): 1582-1587.
DING Kai, LI Qing-quan, ZHU Jia-song, WANG Chi-sheng, CUI Yang, GUAN Ming-lei, WANG Dan, FAN Xing. Analysis of Diffuse Attenuation Coefficient Spectra of Coastal Waters of Hainan Island and Performance Estimation of Airborne LiDAR Bathymetry. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2018, 38(05): 1582-1587.
[1] LI Qing-quan, LU Yi, HU Shui-bo, et al(李清泉, 卢 艺, 胡水波，等). Journal of Remote Sensing(遥感学报), 2016, 20(5): 1216.
[2] Wang Chisheng, Li Qingquan, Liu Yanxiong, et al. ISPRS Journal of Photogrammetry and Remote Sensing, 2015, 101: 22.
[3] Banic J, Sizgoric S, O’Neil R. Proc SPIE, Laser Radar Technology and Applications, 1986, 0663: 187.
[4] Guenther G C. Airborne Laser Hydrography: System Design and Performance Factors. National Oceanic and Atmospheric Administration. Roclerille MD, 1985.
[5] Guenther G C. Digital Elevation Model Technologies and Applications: the DEM Users Manual, Bethesda: ASPRS, 2007. 237.
[6] Baker K S, Smith R C. Proc SPIE, Ocean Optics Ⅵ, 1980, 0208: 60(doi: 10.1117/12.958264).
[7] Yu Xiaolong, Salama M S, Shen Fang, et al. Remote Sensing of Environment, 2016, 175: 109.
[8] Kirk J T. Light and Photosynthesis in Aquatic Ecosystems. Cambridge University Press, 1994.
[9] Steinvall O, Klevebrant H, Lexander J, et al. Applied Optics, 1981, 20(19): 3284.
[10] XU Qi-yang, YANG Kun-tao, WANG Xin-bing, et al(徐啟阳，杨坤涛，王新兵，等). Blue-Green LiDAR Ocean Survey(蓝绿激光雷达海洋探测). Beijing: National Defense Industry Press(北京： 国防工业出版社), 2002.
[11] JIANG Lu, ZHU Hai, LI Song(姜 璐, 朱 海, 李 松). Laser & Infrared(激光与红外), 2005, 35(6): 397.
[12] CHEN Wen-ge, HUANG Ben-xiong, YANG Zong-kai, et al(陈文革, 黄本雄，杨宗凯，等). Acta Electronica Sinica(电子学报), 1996，24(6): 47.
[13] Mankovsky V I. Oceanology, 2014, 54(1): 32.
[14] Zaneveld J R V, Bartz R, Kitchen J C. Proc SPIE, Ocean Optics Ⅹ, 1990, 1302: 124(doi: 10.1117/12.21439).
[15] Jamet C, Loisel H, Dessailly D. Journal of Geophysical Research Atmospheres, 2012, 117: C10023.
[16] WANG Xiao-mei, TANG Jun-wu, DING Jing, et al(王晓梅，唐军武，丁 静，等). Acta Oceanologica Sinica(海洋学报), 2005, 27(5): 38.
[17] LI Kai, TONG Xiao-chong, ZHANG Yong-sheng, et al(李 凯, 童晓冲, 张永生，等). Journal of Remote Sensing(遥感学报),2015, 19(5): 761.
[18] SHEN Er-hua, ZHANG Yong-sheng, LI Kai, et al(申二华, 张永生, 李 凯，等). Journal of Image and Graphics(中国图象图形学报), 2016, 21(4): 451.
[19] CUI Ting-wei, ZHANG Jie, MA Yi, et al(崔廷伟, 张 杰, 马 毅，等). Journal of Remote Sensing(遥感学报), 2009, 13(3): 411.
[20] Gordon H R, Smith R C, Ronald J, et al. Proc SPIE, Ocean Optics Ⅵ, 1980, 0208: doi: 10.1117/12.958262.
[21] Hovis W, Clark D, Anderson F, et al. Science, 1980, 210(4465): 60.
[22] Austin R, Petzold T J. Oceanography from Space. New York: Springer, 1981. 239.
[23] Austin R, Petzold T. Optical Engineering, 1986, 25(3): 471.
[24] Mueller J L. Medicine Today, 2000, 5(1): 16.
[25] Morel A, Huot Y, Gentili B, et al. Remote Sensing of Environment, 2007, 111(1): 69.
[26] NASAWebsite. https://oceancolor.gsfc.nasa.gov/.Access:6.16, 2017.
[27] Wang Guifen, Cao Wenxi, Yang Dingtian, et al. Chinese Journal of Oceanology and Limnology, 2008, 26(3): 323.
[28] XU Da-zhi, CAO Wen-xi, WANG Gui-fen(许大志, 曹文熙, 王桂芬). Journal of Tropical Oceanography(热带海洋学报)，2007, 26(2): 15.
[29] Pierce J W, Fuchs E, Nelson S, et al. Proc SPIE, Algorithms and Technologies for Multispectral, Hyperspectral, and Ultraspectral Imagery ⅩⅥ, 2010. 7695: 76950V(doi: 10.1117/12.851933).
[30] Tuell G, Barbor K, Wozencraft J. Proc SPIE, 2010, 7695: 76950R(doi: 10.1117/12.851905).
[31] Barnes W L, Xiong X, Salomonson V V. Advances in Space Research, 2003, 32(11): 2099.
