基于Sentinel-3A的北部湾海域叶绿素a浓度遥感反演研究
Inversion of Beibu Gulf Chlorophyll a Concentration based on Sentinel-3A Satellite
沈娟 1周治刚 2张彤辉 2刘大召3
作者信息
- 1. 华南理工大学印度洋岛国研究中心,广东 广州 510641
- 2. 广东省土地调查规划院,广东 广州 510062
- 3. 广东海洋大学,广东 湛江;广东省海洋遥感与信息技术工程技术中心,广东 湛江
- 折叠
摘要
以北部湾为研究对象,基于Sentinel-3A卫星搭载的OCLI水色传感器,探索了叶绿素浓度的遥感反演方法.通过利用实测光谱数据对北部湾海域进行了分区,结合实测的叶绿素a浓度和Sentinel-3A遥感数据尝试不同的反演因子,包括波段比值、波段差值和波段差比,构建了叶绿素a浓度的遥感反演模型.研究结果表明:①北部湾海域的遥感反射率曲线呈现明显的分区的特征,结合光谱特征将北部湾海域分为近岸水体、过渡水体和离岸水体;②不同水体类型适用不同的反演因子构建模型,其中Rrs(764.375)/Rrs(681.25)用于近岸水体,[1/Rrs(620)-1/Rrs(708.75)]/Rrs(753.75)用于过渡水体,Rrs(708.75)-Rrs(764.375)用于离岸水体,均取得了较好的拟合效果,相应的R2值分别为0.67、0.80和0.8;③分区的方法有效的提高了遥感反演北部湾叶绿素浓度模型的适用性和精度.研究基于Sentinel-3A卫星OCLI数据的分区模型,成功实现了对北部湾水体叶绿素浓度的遥感反演,同时,实现了北部湾叶绿素浓度的遥感监测,并为提升海洋生态环境管理和保护提供了重要的科学依据.
Abstract
This study,focused on the area of Beibu Gulf,explores the remote sensing inversion method for chlo-rophyll concentration based on the Sentinel-3A satellite's OCLI water color sensor.The study partitions the Bei-bu Gulf by using measured spectral data and then combines the measured chlorophyll-a concentration with Senti-nel-3A remote sensing data of which aims to build the remote sensing inversion model for chlorophyll-a concen-tration.The results show that(1)the remote sensing reflectance curves exhibit distinct partition characteristics,dividing the area into nearshore,transitional,and offshore water types based on the spectral features;(2)Dif-ferent water types require different inversion factors for model construction,and all of them got relatively good fitted result.Among them,the fitted inversion factor is Rrs(764.375)/Rrs(681.25)that could be used in the near-shore water,for the transitional water,[1/Rrs(620)-1/Rrs(708.75)]/Rrs(753.75)is the most suitable,and for the offshore water,Rrs(708.75)-Rrs(764.375)achieves the best fitting performance,with corresponding R2 val-ues of 0.67,0.80,and 0.8,respectively;(3)The partitioning method effectively improves the applicability and accuracy of the remote sensing inversion model for chlorophyll concentration in the Beibu Gulf.This study suc-cessfully realizes the remote sensing inversion of chlorophyll concentration in the Beibu Gulf by using a partition-ing model based on Sentinel-3A satellite's OCLI data.The result provides the important scientific support for the remote sensing monitoring of chlorophyll concentration in the Beibu Gulf,and enhances the management and protection of marine ecological environments.
关键词
叶绿素a浓度/反演/Sentinel-3A卫星/北部湾Key words
Chlorophyll a concentration/inversion/Beibu Gulf/Sentinel-3A satellite引用本文复制引用
出版年
2024
NETL
NSTL
维普
万方数据