Article(id=1211299030701838391, tenantId=1146029695717560320, journalId=1149651085930835976, issueId=1211299024825611053, articleNumber=null, orderNo=null, doi=10.12284/hyxb2023026, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=research-article, receivedDate=1652112000000, receivedDateStr=2022-05-10, revisedDate=1661356800000, revisedDateStr=2022-08-25, acceptedDate=null, acceptedDateStr=null, onlineDate=1766725793767, onlineDateStr=2025-12-26, pubDate=1677600000000, pubDateStr=2023-03-01, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1766725793767, onlineIssueDateStr=2025-12-26, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1766725793767, creator=13701087609, updateTime=1766725793767, updator=13701087609, issue=Issue{id=1211299024825611053, tenantId=1146029695717560320, journalId=1149651085930835976, year='2023', volume='45', issue='3', pageStart='1', pageEnd='158', issueExtLink='null', onlineDate='null', pubDate='null', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1766725792365, creator=13701087609, updateTime=1766924576395, updator=13701087609, preIssue=null, nextIssue=null, ext={EN=IssueExt(id=1212132785515532522, tenantId=1146029695717560320, journalId=1149651085930835976, issueId=1211299024825611053, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1212132785515532523, tenantId=1146029695717560320, journalId=1149651085930835976, issueId=1211299024825611053, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null}, startPage=136, endPage=146, ext={EN=ArticleExt(id=1211299031477784642, articleId=1211299030701838391, tenantId=1146029695717560320, journalId=1149651085930835976, language=EN, title=Evaluation of validity of bathymetry retrieval data based on high-spatial resolution remote sensing image, columnId=1194652705852465724, journalTitle=Haiyang Xuebao, columnName=Article, runingTitle=null, highlight=null, articleAbstract=

Satellite derived bathymetric using multispectral imagery is an effective means to obtain shallow water depth information. However, its validity is limited to optical shallow water areas, but presents a “pseudo-shallow sea” distortion phenomenon in deep water areas. Therefore, accurately identifying the valid region of satellite derived bathymetry (SDB) data is crucial for its wide application. Based on high-spatial resolution remote sensing image, a data-driven method for evaluating the validity of SDB based on analysis of the differences in the statistical distribution of radiance in deep/shallow water regions is proposed in this paper. This method uses the local standard deviation of the radiance information of satellite images as a feature, optimizes the statistical characteristics of the optical deep water area based on the K-S test method, and uses the hypothesis test method to identify the SDB corresponding to the deep water invalid area. The experimental results in Ganquan Island region show that the method can effectively identify the invalid SDB associated with the optical deep water area by dividing the boundary between optical shallow and deep water area. After removing the invalid data, the mean absolute error (MAE) of SDB in the optical shallow region is 1.01, and the root mean square error (RMSE) is 1.52. The experimental results show that the proposed method can accurately identify the optical shallow region of SDB result, which benefits the interpretation and application of SDB results.

, correspAuthors=Kai Zhang, authorNote=null, correspAuthorsNote=null, copyrightStatement=Copyright © 2023 Pratacultural Science. All rights reserved., copyrightOwner=null, extLink=null, articleAbsUrl=null, sourceXml=null, magXml=null, pdfUrl=null, pdf=null, pdfFileSize=null, pdfExtLink=null, richHtmlUrl=null, mobilePdfUrl=null, reviewReport=null, pdfFirstPage=null, abstractGraph=null, abstractGraphContent=null, abstractVideo=null, citation=null, cebUrl=null, magXmlContent=null, mapNumber=null, authorCompany=null, fund=null, authors=null, authorsList=Yanru Wang, Liyong Zhang, Wen Liu, Kai Zhang, Xin Wang), CN=ArticleExt(id=1211299033931452645, articleId=1211299030701838391, tenantId=1146029695717560320, journalId=1149651085930835976, language=CN, title=基于高空间分辨率遥感影像的水深反演有效性评估, columnId=1149698756456657529, journalTitle=海洋学报, columnName=论文, runingTitle=null, highlight=null, articleAbstract=

卫星遥感反演水深(Satellite Derived Bathymetry, SDB)是获取浅海水深信息的有效手段。然而,其有效范围只限于光学浅水区域,在深水区域呈现“伪浅海”的失真现象。因此,如何准确识别SDB数据的有效范围对其广泛应用至关重要。本文基于高空间分辨率多光谱卫星影像,在深入分析深/浅水辐射亮度统计分布特征差异的基础上,提出一种数据驱动的水深反演有效性评价方法。该方法以卫星影像辐亮度信息的局域标准差作为特征,基于K-S检验方法对光学深水区域统计特征进行模型优选,并使用假设检验方法对深水无效区域对应的SDB进行识别。甘泉岛水域实验结果表明,该方法通过统计分布划分光学浅水与深水区域边界,可以有效识别光学深水区域产生的无效水深反演数据。在剔除无效区域数据后,光学浅水有效区域内水深反演平均绝对误差(MAE)为1.01,均方根误差(RMSE)为1.52。实验结果表明,本文提出的方法可准确识别SDB结果的有效区域,进而为浅海地形解译提供方法支撑。

, correspAuthors=张凯, authorNote=null, correspAuthorsNote=
*张凯(1983-),男,副教授,主要从事海洋测绘相关研究。E-mail:
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王燕茹(1998-),女,山东省济南市人,主要从事海洋水深反演研究。E-mail:

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王燕茹(1998-),女,山东省济南市人,主要从事海洋水深反演研究。E-mail:

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Wiley: Wiley InterScience, 2008., articleTitle=null, refAbstract=null), Reference(id=1215304260963717978, tenantId=1146029695717560320, journalId=1149651085930835976, articleId=1211299030701838391, doi=null, pmid=null, pmcid=null, year=null, volume=null, issue=null, pageStart=null, pageEnd=null, url=null, language=null, rfNumber=33, rfOrder=45, authorNames=null, journalName=null, refType=null, unstructuredReference=Zhang K, Wang X, Wu Z, et al. Improving statistical uncertainty estimate of satellite-derived bathymetry by accounting for depth-dependent uncertainty[J]. 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a. Location of the Yongle Atoll; b. satellite image of Yongle Atoll; c. satellite image of Ganquan Island

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a. 永乐环礁地理位置

;b. 永乐环礁卫星影像;c. 甘泉岛卫星影像

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a. Radiance of blue band; b. radiance of green band; c. distribution of radiance standard deviation feature of blue band; d. distribution of radiance standard deviation feature of green band

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a. 蓝波段辐亮度;b. 绿波段辐亮度;c. 蓝波段辐亮度标准差特征分布;d. 绿波段辐亮度标准差特征分布

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a. Blue band division threshold; b. blue band to determine deep water area; c. green band division threshold; d. green band to determine deep water area

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a. 蓝波段划分阈值;b. 蓝波段确定深水区域;c. 绿波段划分阈值;d. 绿波段确定深水区域

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Probability density functions and standard deviation computation formula of five candidate statistical distributions

, figureFileSmall=null, figureFileBig=null, tableContent=
分布函数瑞利分布韦伯尔分布正态分布伽马分布对数正态分布
 注:MAD为中位数的绝对偏差。
概率密度函数${\dfrac{x}{v^2} {\rm{e}}^{-\frac{x^2}{2v^2} } }$${\dfrac{\sigma}{\lambda}x^{v-1}{\rm{e}}^{\frac{x^v}{\lambda} } }$${\dfrac{1}{\sqrt{2{\text{π}} v^2} }{\rm{e}}^{\frac{-(x-\lambda)^2}{2v^2} } }$$\dfrac{\lambda^vx^{v-1} }{\varGamma(v)}{\rm{e}}^{-\lambda x}$${\dfrac{1}{\sqrt{2{\text{π}}}xv}{\rm{e}}^{-\frac{({\rm{ln}}\;x-\lambda)^2}{2v^2} } }$
标准差${\sqrt{4-{{\text{π}} }/2v} }$${\lambda^{\frac{1}{v}} }$1.482 6×MAD(xi)${\dfrac{1}{\lambda}\sqrt{v} }$1.482 6×MAD(ln xi)
), ArticleFig(id=1215304253812429467, tenantId=1146029695717560320, journalId=1149651085930835976, articleId=1211299030701838391, language=CN, label=表1, caption=

5种候选统计分布的概率密度函数及标准差求解公式

, figureFileSmall=null, figureFileBig=null, tableContent=
分布函数瑞利分布韦伯尔分布正态分布伽马分布对数正态分布
 注:MAD为中位数的绝对偏差。
概率密度函数${\dfrac{x}{v^2} {\rm{e}}^{-\frac{x^2}{2v^2} } }$${\dfrac{\sigma}{\lambda}x^{v-1}{\rm{e}}^{\frac{x^v}{\lambda} } }$${\dfrac{1}{\sqrt{2{\text{π}} v^2} }{\rm{e}}^{\frac{-(x-\lambda)^2}{2v^2} } }$$\dfrac{\lambda^vx^{v-1} }{\varGamma(v)}{\rm{e}}^{-\lambda x}$${\dfrac{1}{\sqrt{2{\text{π}}}xv}{\rm{e}}^{-\frac{({\rm{ln}}\;x-\lambda)^2}{2v^2} } }$
标准差${\sqrt{4-{{\text{π}} }/2v} }$${\lambda^{\frac{1}{v}} }$1.482 6×MAD(xi)${\dfrac{1}{\lambda}\sqrt{v} }$1.482 6×MAD(ln xi)
), ArticleFig(id=1215304253934064288, tenantId=1146029695717560320, journalId=1149651085930835976, articleId=1211299030701838391, language=EN, label=Table 2, caption=

Test results of the goodness of fit of K-S test

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分布函数

瑞利分布

韦伯尔分布

正态分布

伽马分布

对数正态分布
 注:表中数据为最大偏差值,数值越小,拟合效果越好。
蓝波段0.320.110.080.060.04
绿波段0.420.100.060.040.03
), ArticleFig(id=1215304254022144676, tenantId=1146029695717560320, journalId=1149651085930835976, articleId=1211299030701838391, language=CN, label=表2, caption=

K-S检验的拟合优度检验结果

, figureFileSmall=null, figureFileBig=null, tableContent=

分布函数

瑞利分布

韦伯尔分布

正态分布

伽马分布

对数正态分布
 注:表中数据为最大偏差值,数值越小,拟合效果越好。
蓝波段0.320.110.080.060.04
绿波段0.420.100.060.040.03
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基于高空间分辨率遥感影像的水深反演有效性评估
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王燕茹 1 , 张利勇 1 , 刘文 1 , 张凯 1, 2, * , 王鑫 1, 3
海洋学报 | 论文 2023,45(3): 136-146
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海洋学报 | 论文 2023, 45(3): 136-146
基于高空间分辨率遥感影像的水深反演有效性评估
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王燕茹1 , 张利勇1, 刘文1, 张凯1, 2, * , 王鑫1, 3
作者信息
  • 1 山东科技大学 测绘与空间信息学院,山东 青岛 266590
  • 2 自然资源部第二海洋研究所,浙江 杭州 310012
  • 3 广州三海海洋工程勘察设计有限公司,广东 广州 510220
  • 王燕茹(1998-),女,山东省济南市人,主要从事海洋水深反演研究。E-mail:

通讯作者:

*张凯(1983-),男,副教授,主要从事海洋测绘相关研究。E-mail:
Evaluation of validity of bathymetry retrieval data based on high-spatial resolution remote sensing image
Yanru Wang1 , Liyong Zhang1, Wen Liu1, Kai Zhang1, 2, * , Xin Wang1, 3
Affiliations
  • 1College of Geodesy and Geomatics, Shandong University of Science and Technology, Qingdao 266590, China
  • 2Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou 310012, China
  • 3Guangzhou Sanhai Marine Engineering Surveying & Designing Co., Ltd., Guangzhou 510220, China
出版时间: 2023-03-01 doi: 10.12284/hyxb2023026
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卫星遥感反演水深(Satellite Derived Bathymetry, SDB)是获取浅海水深信息的有效手段。然而,其有效范围只限于光学浅水区域,在深水区域呈现“伪浅海”的失真现象。因此,如何准确识别SDB数据的有效范围对其广泛应用至关重要。本文基于高空间分辨率多光谱卫星影像,在深入分析深/浅水辐射亮度统计分布特征差异的基础上,提出一种数据驱动的水深反演有效性评价方法。该方法以卫星影像辐亮度信息的局域标准差作为特征,基于K-S检验方法对光学深水区域统计特征进行模型优选,并使用假设检验方法对深水无效区域对应的SDB进行识别。甘泉岛水域实验结果表明,该方法通过统计分布划分光学浅水与深水区域边界,可以有效识别光学深水区域产生的无效水深反演数据。在剔除无效区域数据后,光学浅水有效区域内水深反演平均绝对误差(MAE)为1.01,均方根误差(RMSE)为1.52。实验结果表明,本文提出的方法可准确识别SDB结果的有效区域,进而为浅海地形解译提供方法支撑。

水深反演  /  数据有效性  /  伪浅海  /  光学浅水区域

Satellite derived bathymetric using multispectral imagery is an effective means to obtain shallow water depth information. However, its validity is limited to optical shallow water areas, but presents a “pseudo-shallow sea” distortion phenomenon in deep water areas. Therefore, accurately identifying the valid region of satellite derived bathymetry (SDB) data is crucial for its wide application. Based on high-spatial resolution remote sensing image, a data-driven method for evaluating the validity of SDB based on analysis of the differences in the statistical distribution of radiance in deep/shallow water regions is proposed in this paper. This method uses the local standard deviation of the radiance information of satellite images as a feature, optimizes the statistical characteristics of the optical deep water area based on the K-S test method, and uses the hypothesis test method to identify the SDB corresponding to the deep water invalid area. The experimental results in Ganquan Island region show that the method can effectively identify the invalid SDB associated with the optical deep water area by dividing the boundary between optical shallow and deep water area. After removing the invalid data, the mean absolute error (MAE) of SDB in the optical shallow region is 1.01, and the root mean square error (RMSE) is 1.52. The experimental results show that the proposed method can accurately identify the optical shallow region of SDB result, which benefits the interpretation and application of SDB results.

bathymetric retrieval  /  data validity  /  pseudo-shallow sea  /  optical shallow water area
王燕茹, 张利勇, 刘文, 张凯, 王鑫. 基于高空间分辨率遥感影像的水深反演有效性评估. 海洋学报, 2023 , 45 (3) : 136 -146 . DOI: 10.12284/hyxb2023026
Yanru Wang, Liyong Zhang, Wen Liu, Kai Zhang, Xin Wang. Evaluation of validity of bathymetry retrieval data based on high-spatial resolution remote sensing image[J]. Haiyang Xuebao, 2023 , 45 (3) : 136 -146 . DOI: 10.12284/hyxb2023026
浅海水深数据对航海线路的选择、近岸海洋工程建设和海岸带生态研究具有重要意义[1]。目前,浅海区域的现场水深测量主要依靠船载声呐测量与机载激光雷达测深两种手段[2-5]。船载声呐是准确获取水深信息的主流方法,但在浅水区域测量效率有限,且有航行安全隐患。机载激光雷达测深可高效获取浅海水深信息,但存在测量成本高以及空域限制等问题。因此,浅海水深信息的高效获取一直是海洋测绘领域的重要研究课题。限于现场测量方法效率上的不足,在我国长达3.2×104 km的海岸线上,仍然存在大量空白区域尚未进行水深测量。对此,基于多光谱卫星影像的遥感水深反演方法,可以高效获取水质清澈的近岸水域水深信息。卫星遥感反演水深 (Satellite Derived Bathymetry ,SDB)可获取高现势性的近岸水深信息,有效提升浅海水深数据的时空覆盖范围,是现场测量的重要补充手段[6]
光学遥感水深反演方法始于20世纪60年代。随着多光谱遥感卫星技术的不断发展,多光谱卫星影像数据的时空覆盖范围显著增加,该方法逐渐成为研究热点[7]。水深反演模型主要包括理论解译模型、半理论半经验模型和统计相关模型[8-9]。理论解译模型基于水光场辐射传输方程,通过测量水体内部的光学参数来计算水体深度[7, 10-13]。此类模型理论严密,但所需水体光学参数较多且获取困难,使得模型构造过于复杂,因而难以得到广泛应用。半理论半经验模型基于光在水体中的辐射衰减特性,采用理论模型与经验参数相结合的方式实现水深反演,目前已经形成了如单波段模型、双波段模型和多波段模型等多种解算方法[14-22]。其中,Stumpf对数比值模型[23]因其模型构造简单,物理机制清晰而被广泛应用。统计相关模型是通过建立遥感图像光谱值和实测水深值之间的相关关系而获得水深数据的模式[24-26],此类模型高度依赖实测水深数据量的多少,当训练样本充足时,往往可以获得较好的水深反演结果。
经过几十年探索,卫星遥感水深反演算法的模型结构不断优化,其精度亦显著提高。然而,在聚焦水深反演精度提升的同时,现有研究对其结果的有效性评估却鲜有关注。限于可见光对海水的穿透能力有限,水深反演结果只能适用于有限的近岸浅水区域,其具体范围取决于天气、水质和海底光反射率等因素的综合影响,目前尚无模型可以有效描述。而在深水区域,水深反演结果严重失真,并呈现“伪浅海”的假象,严重误导水深反演结果解译。因此,如何准确识别浅水有效区域和深水无效区域的边界,对反演结果的有效应用来说,是一个亟待解决的重要问题。然而,针对这一问题,目前国内外对此进行的相关研究非常有限。其中,Lee等[27]借助ICESat-2卫星测深数据辅助,提出了一种针对高分辨率多光谱卫星反演结果的可靠性评估方法。然而,该方法依赖于ICESat-2卫星测深数据对水深反演区域的覆盖,从而限制了其广泛应用。因此,有必要从多光谱影像数据本身出发,在不借助额外辅助信息的前提下,研究卫星遥感水深反演有效性评估方法。
针对上述问题,本文聚焦于高空间分辨率多光谱遥感影像中光学浅水/深水区域的辐射亮度统计分布特征差异,研究以高分辨率多光谱影像和少量实测水深真值数据驱动的卫星遥感反演水深有效性评估方法。
本文研究区域为甘泉岛周边水域。甘泉岛位于南海西沙群岛永乐环礁的西部(图1),总面积约为0.3 km2,呈椭圆形。该岛为典型的珊瑚岛,岛屿周围为珊瑚礁盘地貌,海底地形复杂,且距离大陆较远,使用传统方法进行水深测量较为困难。但南海海域水质洁净,非常适合进行多光谱遥感水深反演研究。
实验所采用的遥感影像数据为GeoEye-1高空间多光谱遥感影像(图2a),拍摄于2013年2月18日,基于WGS-84坐标系、通用横轴墨卡托投影,空间分辨率为2 m,包含蓝、绿、红以及近红外4个波段。该多光谱影像数据是以无云层遮盖为标准,在良好的天气情况下采集的。实测水深数据(图2b)为2013年1月的激光雷达测深数据与2016年5月多波束测深数据合成产品。其中浅水区域为激光雷达测深数据,该数据是由机载Optech Aquarius测深系统获取,POS AV 510导航系统用于提供1.5~3 m的水平位置精度,后经波形提取、滤波、人工剔除异常点等操作后得到的点云数据集。对于激光信号难以穿透的深水区域,水下地形由多波束测深系统进行测量。由机载激光测深和多波束测深数据组成的真值水深数据集,在经过潮汐改正后,其误差小于实际水深的1%。
研究表明,当海面受风浪影响时,太阳光会在粗糙海面发生菲涅尔反射,遥感图像相应地产生白色耀斑,严重影响影像质量。因此在GeoEye-1影像利用辐射定标与大气校正得到真实水体辐射率后,需要通过 Hedley等[28]的方法消除太阳耀斑。随后,将实测水深数据转换到与遥感影像相同坐标系下,进行地理配准,以确保水深点与同一位置像元值相对应。除此之外,由于遥感影像中包括的水深信息为卫星过境时摄取的瞬时海面深度,实测水深是以理论深度基准面为基准的稳态水深,而水深反演是通过将二者拟合进行建模,所获得的反演结果将自动归算到实测水深的基准上。
从方法的普适性角度出发,本文基于广泛应用的Stumpf模型(式(1))对甘泉岛多光谱影像进行水深反演。
$ d = {\beta _0} + {\beta _1} \times\frac{{\ln [ {t \times {R_w}( {{\lambda _{\rm{b}}}} )} ]}}{{\ln [ {t \times {R_w}( {{\lambda _{\rm{g}}}} )} ]}} = {\beta _0} + {\beta _1} \times x , $
式中,d为反演水深;$\ {\beta _0} $$\ {\beta _1} $为待拟合系数;t为缩放比例因子;${R_w}( {{\lambda _{\rm{b}}}} )$${R_w}( {{\lambda _{\rm{g}}}} )$分别为蓝、绿波段辐射率;$ {{\lambda _{\rm{b}}}}$${{\lambda _{\rm{g}}}} $分别为未进行预处理之前的蓝、绿波长。
为保证浅水有效区域数据反演的准确性,选取2 281个实测水深点,其中435个作为训练数据用于拟合回归模型参数,剩下的1 846个水深点作为验证数据进行模型精度检验,最终拟合系数分别为−7.67和80.04。实验所得决定系数$ {R^2} $为0.89,均方根误差为1.07。利用所得模型参数得到实验区域的水深反演结果(图2c)。通过对比真值水深数据可以看出,卫星水深反演结果的有效范围主要分布于近岸浅水区域,而在深水无效区域则呈现 “伪浅海”假象。
在水深光学遥感(图3)中,卫星传感器接收到的光辐射信号主要包括大气辐射信息、水体辐射信息和可能存在的水底反射信息,其中水底反射光信息是水下地形反射可见光所产生的回波信号,是遥感水深反演的物理基础[29]。卫星水深反演过程中,可见光在深/浅水区域传输路径上存在差异性。对于光学深水区域来说,由于太阳辐射在传输过程中,水体对其的吸收与散射导致太阳辐射难以穿过水体到达水底,所以光学深水区域辐亮度信息由海水的散射和反射成分贡献,仅受海水本身光学性质影响[30]。而在浅水区域中,海底受到阳光有效照射后会产生强反射。由于浅海区域复杂地形以及底质分布的影响,导致该区域辐亮度数据复杂多变。
相较于浅水区域海底产生的复杂强反射,光学深水区域的辐亮度值普遍偏低,并由于其本身光学特征较稳定,辐亮度值波动较小,并具有比较单一的统计分布特征。基于该差异,卫星影像蓝绿波段的辐亮度统计量[均值、标准差(Standard Deviation, STD)]是光学深/浅水区域的潜在有效识别特征。对此,本文的研究思路从实际数据的局域统计量入手,寻找光学浅水与深水区域在特征空间中的准确边界,通过探索弱信号区域的数据统计分布规律,提取光学深水区域。基于遥感影像的局域均值与局域标准差的统计分布如图4所示,从图中可以看出,相比于局域均值来说,局域标准差在光学深/浅水区域的统计区分度更加显著。因此,本文以蓝、绿波段辐亮度值的局域标准差统计量作为主要特征,研究光学深/浅水区域的划分方法。
为划分水深反演的有效浅水区域和无效深水区域,本文使用局域滑动子窗计算不同区域的标准差表征局域辐亮度统计特性[31]。在每个局域子窗中,标准差通过如下公式计算:
$ {\sigma _k} = \sqrt {\frac{{\displaystyle\sum\limits_{i = 1}^N {({x_{ki}} - {x_{\rm{{mean}}}}) ({x_{ki}} - {x_{\rm{{mean}}}})} }}{N}} , $
式中,$ {\sigma _k} $为第k个窗口的标准差;$ {x_{ki}} $是第k个窗口中第i个辐亮度值;${x_{\rm{{mean}}}} =\displaystyle {{\displaystyle\sum\limits_{i = 1}^n {{x_i}} }}/{n}$是局域子窗中辐亮度的平均值。
宏观角度而言,光学深水区域的光辐射受水体水质影响,将产生明显的时空变化特征。在典型的卫星水深反演场景中,区域范围的有限性使得深水区域的水质趋近于均质,故其统计分布特性可以用单一分布进行近似。因此,如果可以从现象角度对深水区域的辐亮度统计分布进行拟合,将可以基于统计假设检验原理对光学深水区域进行识别。对此,在有效提取其统计分布特征的前提下,可用于深水区域的划分。本研究使用K-S检验(Kolmogorov-Smirnov Test)[32]来确定深水区域统计分布特征。
K-S检验作为一种针对连续分布的非参数检验方法,通过比较数据的实际频数分布与特定理论分布间的最大差距距离$ {D_N} $,判断实际频数分布是否服从特定理论分布。
假设样本数据$( {{x_1},{x_2}, \cdots ,{x_N}} )$符合理论分布$ F\left( x \right) $,经验分布函数$S \left( x \right)$
$ S \left( x \right) = \dfrac{1}{N}\sum\limits_{i = 1}^N {{I_{\left\{ {{x_i} \leqslant x} \right\}}} = \left\{ {\begin{array}{*{20}{c}} {0,}&{x < {x_1}}, \\ {\dfrac{k}{n},}&{{x_k} \leqslant x < {x_{k + 1}},\;\;k = 1,2, \cdots ,N - 1} \\ {1,}&{x \geqslant {x_N}}, \end{array}} \right.} \text{,} $
则最大偏差$ {D_N} $的计算方法为
$ {D_N} = {\text{max}}\left| {S \left( x \right) - F\left( x \right)} \right| \text{,} $
$ {D_N} $值越小,表示拟合效果越好,样本数据越接近理论分布函数。
本文选用5种常用统计分布作为深水区域所对应的理论分布$ F\left( x \right) $的候选,通过极大似然法估计模型参数后,利用K-S检验与实际数据选取最相符的候选统计分布。所选用的5种常见统计分布及其概率密度函数如表1所示,其中$ \lambda $$ \nu $为模型参数。
确定深水区域的统计分布后,基于其模型参数估计值,在假设检验的统计框架下,设置光学深/浅水区域的划分阈值。为保证可以大限度地获取光学深水区域所对应的标准差值${t}$,本研究基于4$ \sigma $进行阈值划定,公式如下:
$ {t_i} = \left\{ {i \in {D_k}:{t_i} < {t_{\rm{{dep}}}} = {\mu _t} + 4{\sigma _t}} \right\} \text{,} $
式中,$ {D_k} $为第k个局域子窗;$ {t_i} $为光学深水区域局域标准差值;${t_{\rm{{dep}}}}$为光学深水区域范围最大阈值;$ {\mu _t} $$ {\sigma _t} $分别为$ {t_i} $的均值与标准差。
标准差$ {\sigma _t} $求解公式是在模型参数$ \lambda $$ \nu $的基础之上获得的,其中,${\text{median}}\left( \cdot \right)$为中值求解公式,${\rm{MAD}}\left( \cdot \right)$为中位数绝对偏差,公式为
$ {\rm{MAD}}\left( \cdot \right) = {\rm{median}}\left( {\left| {{x_i} - {\rm{median}}\left( {{x_i}} \right)} \right|} \right) . $
通过上述步骤,可以对单一波段辐亮度数据所对应的光学深/浅水区域范围进行划分。使用水深反演过程中的所有波段数据(本文中为蓝、绿波段)求其光学深水区域,并对不同波段技术结果进行空间并集求解,即可得到最终的水深反演有效区域。本文提出方法的整体流程如图5所示。
首先,从影像波段数据的局域统计量出发,计算光学深/浅水区域的统计分布特征差异。为此,将影像蓝、绿波段剔除掉非水域区域后,使用尺寸为7×7的局域滑动子窗,利用公式(2),求取辐亮度标准差(图6c图6d)。在标准差特征图中,浅水有效区域与深水无效区域的的辐亮度特征差异得以凸显,并能直观观察到两者之间存在明显的边界区域。
对蓝、绿波段的局域标准差特征进行直方图分析(图7),可进一步凸显光学深水区和浅水区域的辐亮度统计特征差异。光学深水区域对应于弱辐亮度标准差,其分布呈现出较为规则的单峰分布特征。相反,光学浅水区域的辐亮度标准差呈现出强烈的局域随机波动,且无明显分布规律特征。这一显著统计特征差异,可以作为深水区域划分的依据。
表2给出了K-S检验的拟合优度检验结果。5种候选分布中,对数正态分布的最大偏差值$ {D_N} $最小。这表明无论蓝波段或绿波段,深水区域的辐亮度统计特征都趋近于对数正态分布,统计分布的“拖尾”现象较为显著。为尽量减小深水区域识别误差引入的水深反演系统偏差,本文基于4$ \sigma $准则(公式(5))进行不同波段的深/浅水区域统计阈值划分(图8a图8c)。对比蓝绿波段数据可以看出,深水区域内蓝波段“拖尾”现象相比绿波段更加明显,导致该波段信号中深/浅水区域在特征空间中的边界相对模糊。这一特征具体体现在深/浅水区域划分结果(图8b图8d)中,其表现为区域边界相对不规则,呈现出较为显著的噪点效果。
通过对蓝、绿波段数据中划定的单一光学深水区域进行逻辑求并集计算后,得到两波段确定的水深反演无效区域,也即为最终的卫星遥感水深反演有效区域。所得有效区域内的实测水深值分布(图9a)基本在27.9 m以下,仅在边缘区域存在较大数据,最大值为37.3 m。图9b为浅水有效区域内水深反演误差分布情况,水深反演的平均绝对误差为1.01,均方根误差为1.52。
为进一步验证算法的效果,提取深/浅水区域边界的水深反演结果进行分析。如图10a所示,边缘区域的实测水深值占比95%以上的区间范围为17.8~35.2 m,此范围内的水深值可近似代表有效区域的整体边界水深信息。图10b为水深反演结果误差随水深变化的趋势。从图中可以看出,水深反演误差与实际水深之间具有显著的统计相关性。图10b中的深/浅水边界区域的整体均方根误差为3.41,从统计角度较为有效地识别了光学深水区域的“伪浅海”假象,保障了水深反演结果的准确性。
卫星遥感水深反演的有效范围只限于光学浅水区域,如何准确评估水深反演结果的有效适用范围是其广泛应用所亟待解决的重要问题。对此,本研究聚焦于光学深/浅水区域的辐射亮度统计分布特征差异,提出了一种数据驱动的水深反演有效性评估方法。基于在甘泉岛水域的实验结果,得出以下结论:
(1)由于回波信号产生机理的显著差异,影像辐亮度值的统计特征在深/浅水区域内具有显著差别。在水体水质与底质的共同作用下,浅水区域反射率高,且其统计分布极不规则,难以用单一统计分布模型加以表征。相比之下,深水区域由于其光学性质相对稳定,辐亮度值偏小,且其统计分布呈现出显著的单峰分布特征。因此,从影像辐亮度值的局域统计特征出发,对光学深/浅水区域进行划分,是一个合理的选择。图4表明,辐亮度数据的局域标准差参量在深/浅水区域具有显著差别,可作为水深反演光学深水区域识别的有效统计指标。
(2)在获取数据局域统计量的过程中,局域子窗的尺寸大小对计算结果有影响,其选择需考虑两方面因素。随着子窗尺寸增大,参与计算的数据量增加,在一定程度上可抑制高频噪声干扰,但统计结果的分辨率将随之降低。本文将窗口尺寸设置为7×7,兼顾了高频噪声干扰的抑制。结果表明,该设置一定程度上抑制了光学深/浅水区域边界中的“噪点”现象。而对于低信噪比卫星影像中显著的“噪点”假象干扰,亦可考虑使用DBSCAN算法进行进一步剔除。
(3)由于光学深水区域水体光学特征相对稳定,产生的辐射亮度值具有规则的统计分布特征。有效估计其统计分布参数,是准确识别光学深水区域的关键。实验表明,使得直方图右侧产生光学深水区域的辐亮度标准差具有显著的“拖尾”现象(图7),高斯分布难以准确表征其统计特性。因此,使用K-S检验从数据本身出发,选取最优统计模型,以提高假设检验结果的准确性,进而提取出光学深水区域。
(4)实验结果表明,基于影像蓝、绿波段辐亮度值的局域标准差所得出的水深反演有效区域,其内部水深反演的平均绝对误差为1.01,均方根误差为1.52。通过进一步提取深/浅水区域边界的水深反演结果,使得划分的水深反演有效性得到了明确的验证,其精度基本与现有文献(平均绝对误差=0.988,均方根误差=1.88)中基于大量实测水深先期划定提取范围后的反演精度处于同一水平[33]
(5)本文提出的方法以影像本身的光谱特征为依据,对光学深/浅水区域进行划分,进而确定卫星水深反演的有效区域。实验表明,针对高空间分辨率卫星影像数据,该方法可有效识别SDB数据中光学深水区域产生的“伪浅海”假象,进而保障水深反演结果的有效性。而对于中低空间分辨率影像(如Sentinel、Landsat),限于其分辨率瓶颈,辐射亮度值的局域统计特征模糊,难以有效区分浅水与深水区域。因此,未来的研究方向可尝试从多源信息融合的角度出发,进一步探索可有效应用于中低空间分辨率影像的水深反演有效区域划分方法。
  • 山东省自然科学基金(ZR2020MD084);山东科技大学科研创新团队支持计划(2019TDJH103)。
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2023年第45卷第3期
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doi: 10.12284/hyxb2023026
  • 接收时间:2022-05-10
  • 首发时间:2025-12-26
  • 出版时间:2023-03-01
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  • 收稿日期:2022-05-10
  • 修回日期:2022-08-25
基金
山东省自然科学基金(ZR2020MD084);山东科技大学科研创新团队支持计划(2019TDJH103)。
作者信息
    1 山东科技大学 测绘与空间信息学院,山东 青岛 266590
    2 自然资源部第二海洋研究所,浙江 杭州 310012
    3 广州三海海洋工程勘察设计有限公司,广东 广州 510220

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*张凯(1983-),男,副教授,主要从事海洋测绘相关研究。E-mail:
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2种不同金属材料的力学参数

Family
属数
Number of
genus
种数
Number of
species
占总种数比例
Percentage of
total species (%)

Genus
种数
Number of
species
占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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