基于Sentinel-2卫星遥感的河口潮滩植被指数构建研究  

Development of estuarine tidal flat vegetation index based on Sentinel-2 satellite remote sensing

作　　者：叶可 田波[1] 王玉纯 YE Ke;TIAN Bo;WANG Yuchun(State Key Laboratory of Estuarine and Coastal Research,East China Normal University,Shanghai 200241,China;School of Public Policy&Management,Anhui Jianzhu University,Hefei 230022,China)

机构地区：[1]华东师范大学河口海岸全国重点实验室,上海200241 [2]安徽建筑大学公共管理学院,合肥230022

出　　处：《华东师范大学学报(自然科学版)》2025年第2期141-153,共13页Journal of East China Normal University(Natural Science)

基　　金：国家重点研发计划(2022YFE0117500)。

摘　　要：河口海岸区域因为受到潮汐动态淹没的影响,位于潮滩前沿和潮沟边缘的低覆盖度植被信息难以被常用的陆地植被指数准确提取.以长江河口潮滩湿地为研究区域,在常用陆地植被指数比较与评价的基础上,结合湿度指数构建了适用于河口潮滩区域的植被指数ETFVI(Estuarine Tidal Flat Vegetation Index),对其提取的植被分布信息和反演的覆盖度结果进行了精度验证.结果表明:ETFVI与常用的8种植被指数相比,由于考虑了下垫面湿度变化对植被指数的影响,提取植被分布信息的准确率和F_(1)值相较第2名分别提高了10.38%和6.9%;ETFVI对植被覆盖度的反演结果与其他8种植被指数相比,平均相对误差最低.研究结果可为河口潮滩区域植被覆盖时空变化监测提供新的思路和方法.Owing to the tidal dynamic inundation,the vegetation information of low cover saltmarsh located at the front of tidal flat and edge of tidal ditch in the estuarine and coastal area is difficult to accurately extract using common terrestrial vegetation indices.This study considered the tidal flat wetland in the Yangtze River Estuary as research area.Based on the comparison and evaluation of commonly used terrestrial vegetation indices,combined with the humidity index,a vegetation index ETFVI(Estuarine Tidal Flat Vegetation Index)suitable for the intended region was developed.The accuracy of the extracted vegetation distribution information and the inverted fractional vegetation cover results was verified.The results suggested that,compared with the commonly used eight vegetation indices,ETFVI improved the extraction accuracy and F_(1) score of vegetation distribution information by 10.38%and 6.9%,respectively,compared to the second place considering the impact of humidity changes of underlying surface on vegetation indices.The fractional vegetation cover inversion results based on ETFVI are consistent with the actual situation,with the lowest mean relative error among various vegetation indices.The study results can provide new ideas and methods for monitoring spatiotemporal changes of vegetation cover in estuarine tidal wetlands.

关 键 词：植被指数 植被覆盖度 长江口 潮滩湿地 湿度指数 

分 类 号：TP79[自动化与计算机技术—检测技术与自动化装置]