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基于欧洲航天局“哨兵-2A”卫星的太湖蓝藻遥感监测
Cyanobacteria Blooms Monitoring in Taihu Lake Based on the Sentinel-2A Satellite of European Space Agency
投稿时间:2017-04-11  修订日期:2017-11-12
DOI:10.19316/j.issn.1002-6002.2018.04.22
中文关键词:  “哨兵-2A”卫星  MSI传感器  归一化植被指数  叶绿素反射峰强度  蓝藻水华  太湖
英文关键词:Sentinel-2A satellite  MSI  normalized differential vegetation index  chlorophyll reflection peak intensity  cyano-bacteria blooms  Taihu Lake
基金项目:国家水体污染控制与治理科技重大专项(2013ZX07502001-5);原环境保护部水体污染控制与治理重大专项"城市黑臭水体遥感监管关键技术先期研究";全国生态状况变化(2010—2015年)调查与评估项目(STWN-01-10);江苏省环境监测科研基金项目(1619)
作者单位
李旭文 江苏省环境监测中心, 江苏 南京 210036 
侍昊 江苏省环境监测中心, 江苏 南京 210036 
张悦 江苏省环境监测中心, 江苏 南京 210036 
牛志春 江苏省环境监测中心, 江苏 南京 210036 
王甜甜 江苏省环境监测中心, 江苏 南京 210036 
丁铭 江苏省环境监测中心, 江苏 南京 210036 
蔡琨 江苏省环境监测中心, 江苏 南京 210036 
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中文摘要:
      欧洲航天局(ESA)2015年6月23日成功发射"哨兵-2A"卫星,该卫星搭载的多光谱成像仪(MSI)在可见光(VIS)至短波红外(SWIR)波长区间配置了多种光谱波段/地面分辨率组合,可以获取大范围、较短重访周期、较高空间分辨率(10 m)的遥感影像。以太湖2016年6月13日MSI数据为例,在完成大气校正的基础上,分析了太湖典型地物类型光谱特征,采用归一化植被指数(NDVI)结合叶绿素反射峰强度(ρchl)构建的综合阈值法对贡湖湾的蓝藻水华信息进行了提取实验。结果表明:"哨兵-2A"卫星MSI影像质量清晰,可精细地反映植被、蓝藻、水体等典型地物类型的光谱特征;ρchl指数对中-高蓝藻聚集区与水生植被、轻度蓝藻聚集区与混合水体具有较好的分离能力;利用综合阈值法提取贡湖湾中-高蓝藻聚集区面积为60.37 km2,主要分布在贡湖北部沿岸、湖心和南部沿岸。"藻-水"混悬体面积为79.49 km2,贡湖湾东部蓝藻水华相对较轻。
英文摘要:
      European Space Agency (ESA) launched Sentinel-2A satellite on June 23, 2015. Sentinel-2A has an optical remote sensing sensor, the Multispectral Instrument (MSI), which provides a combination of various spectral bands/ground resolution among the visible light (VIS) to shortwave infrared (SWIR) portion of the solar spectrum, so it can obtain a wide range and high repeat cycle data. Based on the atmospheric correction MSI data of Taihu Lake on June 13, 2016, the spectrum characteristics of typical vegetation in this aera were analyzed using NDVI and chlorophyll reflection peak intensity (ρchl). As the results showed:Sentinel-2A has high spatial resolution so that can reflect the spectrum characteristics of the vegetation and cyanobacteria blooms and water accurately. ρchl can make a distinction between medium-high cyanobacteria blooms and aquatic vegetation, between mixed water and light cyanobacteria blooms. In Gonghu bay, the area of medium-high cyanobacteria blooms was 60.37 km2, and the area of light cyanobacteria blooms was 79.49 km2.
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