无人机多光谱遥感反演近海fDOM浓度  

Retrieval of Offshore fDOM Concentration by UAV Multispectral Remote Sensing

作　　者：刘善伟[1] 武钰林 许明明 张杰[1] LIU Shanwei;WU Yulin;XU Mingming;ZHANG Jie(College of Ocean and Space Information,China University of Petroleum,Qingdao 266580,China)

机构地区：[1]中国石油大学(华东)海洋与空间信息学院,山东青岛266580

出　　处：《海洋技术学报》2021年第6期33-39,共7页Journal of Ocean Technology

基　　金：国家自然科学基金资助项目(U1906217)。

摘　　要：荧光溶解有机物(Fluorescent Dissolved Organic Matter,fDOM)是沿岸水质、海洋污染程度评价的一个代表性参数,f DOM荧光可作为陆源污染很好的指示剂。考虑到卫星数据受时空分辨率、云雾以及大气校正精度影响等问题,本文采用无人机多光谱遥感数据反演fDOM浓度,以青岛灵山湾为研究区,首先基于海面实测光谱数据及实测水质数据构建多种fDOM浓度反演模型,然后利用效果最优的反演模型开展基于无人机多光谱数据的fDOM浓度反演,并应用于GF-1卫星多光谱影像。实验结果表明:(1)以海面实测光谱R(452.0)/R(560.9)和R(452.0)/R(650.0)波段反射率比值作为特征变量,构建的多元线性回归模型决定系数为0.75,平均相对误差为8.76%;(2)基于实测光谱建立的反演模型可以很好地应用于无人机多光谱数据,实测水质采样位置的f DOM浓度反演值与实测值拟合的决定系数为0.77,平均相对误差为16.34%,GF-1卫星多光谱影像反演得到的研究区fDOM浓度空间分布与海上实测结果趋势基本一致。Fluorescent dissolved organic matter(f DOM) is a representative parameter for the evaluation of coastal water quality and marine pollution. Fluorescence can be used as a good indicator of land-based pollution. Considering that satellite data are affected by spatial-temporal resolution, cloud and atmospheric correction accuracy, this study uses UAV multispectral remote sensing data to retrieve f DOM concentration. The study area is Lingshan Bay in Qingdao. Firstly, a variety of f DOM concentration models are constructed based on the measured spectral data and measured water quality data, and then the best model is used to f DOM concentration inversion based on UAV multispectral data. And the best model is applied to GF-1 satellite multispectral images. The experimental results show that:(1) Taking the reflectance ratios of R(452.0)/R(560.9) and R(452.0)/R(650.0) bands of the measured sea surface spectra as the characteristic variables,the determination coefficient of the multiple linear regression model is 0.75 and the mean relative error is 8.76%;(2) The model based on the measured spectrum can be well applied to the UAV multispectral data. The determination coefficient of the fitting between the inversion value of f DOM concentration and the measured value is 0.77, and the mean relative error is 16.34%. The spatial distribution of f DOM concentration in the study area retrieved from GF-1 satellite multispectral image is basically consistent with the trend of measured results.

关 键 词：fDOM 实测光谱 无人机多光谱 遥感反演 

分 类 号：P237[天文地球—摄影测量与遥感]