基于Otsu算法的太湖蓝藻水华与水生植被遥感同步监测方法
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摘要
蓝藻水华与水生植被在光学遥感影像上容易混淆,传统方法将太湖划分为藻型湖区和草型湖区进行分区监测,近年来太湖梅梁湖等蓝藻水华易发区域出现了大量的水生植物,分区的方法已无法满足蓝藻水华和水生植被遥感监测要求。基于光谱特征分析,采用蓝藻水华与水生植被指数(cyanobacteria and macrophytes index,简称CMI)判别蓝藻水华与水生植被水域,采用浮游藻类指数(floating algae index,简称FAI)识别蓝藻水华、浮叶/挺水植被与沉水植被,构建同步监测决策树,基于Otsu算法自动获取阈值,将中分辨率成像光增仪(MODIS)卫星影像分成湖水、蓝藻水华、沉水植被和浮叶/挺水植被几种类型。结果表明,分类结果较好,符合太湖不同地物类型实际分布情况;与相关研究HJ卫星影像东部湖区水生植被监测结果进行交叉检验,水生植被的空间分布基本一致,一致性检验结果显示,2种分类结果一致的像元比例为70.11%。实现蓝藻水华及水生植物的同步遥感监测,有助于精确评估蓝藻水华的实际强度和水生植被区范围,为富营养化湖泊的水环境管理和决策提供重要的科技支撑。
引文
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[29]李素菊,吴倩,王学军,等.巢湖浮游植物叶绿素含量与反射光谱特征的关系[J].湖泊科学,2002,14(3):228-234.
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[32]Thiemann S,Kaufmann H.Determination of chlorophyll content and trophic state of lakes using field spectrometer and IRS-1C satellite data in the Mecklenburg Lake District,Germany[J].Remote Sensing of Environment,2000,73(2):227-235.
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[34]赵忠明,朱重光.遥感图象中薄云的去除方法[J].遥感学报,1996(3):195-199.
[35]Chen P Y,Srinivasan R,Fedosejevs G,et al.An automated cloud detection method for daily NOAA-14 AVHRR data for Texas,USA[J].International Journal of Remote Sensing,2002,23(15):2939-2950.
[36]何全军,曹静,黄江,等.基于多光谱综合的MODIS数据云检测研究[J].国土资源遥感,2006,18(3):19-22.
[37]周红妹,杨星卫,陆贤.NOAA气象卫星云检测方法的研究[J].遥感学报,1995(2):137-142.
[38]Jedlovec G J,Haines S L,Lafontaine F J.Spatial and temporal varying thresholds for cloud detection in GOES imagery[J].IEEE Transactions on Geoscience and Remote Sensing,2008,46(6):1705-1717.
[39]Wang M H,Shi W.Cloud masking for ocean color data processing in the coastal regions[J].IEEE Transactions on Geoscience and Remote Sensing,2006,44(11):3196-3205.
[40]毛节泰,张军华,王美华.中国大气气溶胶研究综述[J].气象学报,2002,60(5):625-634.
[41]马荣华,唐军武,段洪涛,等.湖泊水色遥感研究进展[J].湖泊科学,2009,21(2):143-158.
[42]吕长春,王忠武,钱少猛.混合像元分解模型综述[J].遥感信息,2003(3):55-58,60.
[2]Havens K E .Cyanobacteria blooms:effects on aquatic ecosystems[M].New York:Springer,2008:68-69.
[3]孔繁翔,高光.大型浅水富营养化湖泊中蓝藻水华形成机理的思考[J].生态学报,2005,25(3):589-595.
[4]吴庆龙,谢平,杨柳燕,等.湖泊蓝藻水华生态灾害形成机理及防治的基础研究[J].地球科学进展,2008,23(11):1115-1123.
[5]马荣华,孔繁翔,段洪涛,等.基于卫星遥感的太湖蓝藻水华时空分布规律认识[J].湖泊科学,2008,20(6):687-694.
[6]段洪涛,张寿选,张渊智.太湖蓝藻水华遥感监测方法[J].湖泊科学,2008,20(2):145-152.
[7]Oyama Y,Matsushita B,Fukushima T.Distinguishing surface cyanobacterial blooms and aquatic macrophytes using Landsat/TM and ETM+shortwave infrared bands[J].Remote Sensing of Environment,2014,157:35-47.
[8]张寿选,段洪涛,谷孝鸿.基于水体透明度反演的太湖水生植被遥感信息提取[J].湖泊科学,2008,20(2):184-190.
[9]马荣华.湖泊水环境遥感[M].北京:科学出版社,2010:461.
[10]Luo J H,Ma R H,Duan H T,et al.A new method for modifying thresholds in the classification of tree models for mapping aquatic vegetation in Taihu lake with satellite images[J].Remote Sensing,2014,6(8):7442-7462.
[11]李俊生,吴迪,吴远峰,等.基于实测光谱数据的太湖水华和水生高等植物识别[J].湖泊科学,2009,21(2):215-222.
[12]朱庆,李俊生,张方方,等.基于海岸带高光谱成像仪影像的太湖蓝藻水华和水草识别[J].遥感技术与应用,2016,31(5):879-885.
[13]Gao B C.NDWI-a normalized differencewater index for remote sensing of vegetation liquid water from space[J].Remote Sensing of Environment,1996,58(3):257-266.
[14]Rogers A,Kearney M.Reducing signature variability in unmixing coastal marsh Thematic Mapper scenes using spectral indices[J].International Journal of Remote Sensing,2004,25(12):2317-2335.
[15]Liu X H,Zhang Y L,Shi K,et al.Mapping aquatic vegetation in a large,shallow eutrophic lake:a frequency-based approach using multiple years of MODIS data[J].Remote Sensing,2015,7(8):10295-10320.
[16]Liang Q C,Zhang Y C,Ma R H,et al.A MODIS-Based novel method to distinguish surface cyanobacterial scums and aquatic macrophytes in lake taihu[J].Remote Sensing,2017,9(2):133.
[17]吕恒,江南,罗潋葱.基于TM数据的太湖叶绿素a浓度定量反演[J].地理科学,2006,26(4):472-476.
[18]周立国,冯学智,王春红,等.太湖蓝藻水华的MODIS卫星监测[J].湖泊科学,2008,20(2):203-207.
[19]王同生.太湖流域防洪与水资源管理[M].北京:中国水利水电出版社,2006:342.
[20]许妍,高俊峰,黄佳聪.太湖湿地生态系统服务功能价值评估[J].长江流域资源与环境,2010,19(6):646-652.
[21]Duan H T,Ma R H,Xu X F,et al.Two-decade reconstruction of algal blooms in China's lake Taihu[J].Environmental Science & Technology,2009,43(10):3522-3528.
[22]Zhao D H,Jiang H,Yang T W,et al.Remote sensing of aquatic vegetation distribution in Taihu Lake using an improved classification tree with modified thresholds[J].Journal of Environmental Management,2012,95(1):98-107.
[23]Revenga C,Kura Y.Status and trends of biodiversity of inland water ecosystems[M]// Status and Trends of Biodiversity of Inland Water Ecosystems.2003.
[24]Luo J H,Li X C,Ma R H,et al.Applying remote sensing techniques to monitoring seasonal and interannual changes of aquatic vegetation in Taihu Lake,China[J].Ecological Indicators,2016,60(50):503-513.
[25]Gordon H R.Atmospheric correction of ocean color imagery in the Earth Observing System era[J].Journal of Geophysical Research-Atmospheres,1997,102(D14):17081-17106.
[26]Gordon H R,Clark D K.Clear water radiances for atmospheric correction of coastal zone color scanner imagery[J].Applied Optics,1981,20(24):4175-4180.
[27]Hu C M.A novel ocean color index to detect floating algae in the global oceans[J].Remote Sensing of Environment,2009,113(10):2118-2129.
[28]Vermote E F,El S N,Justice C O,et al.Atmospheric correction of visible to middle-infrared EOS-MODIS data over land surfaces:Background,operational algorithm and validation[J].Journal of Geophysical Research Atmospheres,1997,102(D14):17131-17141.
[29]李素菊,吴倩,王学军,等.巢湖浮游植物叶绿素含量与反射光谱特征的关系[J].湖泊科学,2002,14(3):228-234.
[30]周艺,周伟奇,王世新,等.遥感技术在内陆水体水质监测中的应用[J].水科学进展,2004,15(3):312-317.
[31]冯伟,冯学智,马荣华.太湖水体叶绿素浓度与反射光谱特征关系的研究[J].遥感信息,2007(1):18-21.
[32]Thiemann S,Kaufmann H.Determination of chlorophyll content and trophic state of lakes using field spectrometer and IRS-1C satellite data in the Mecklenburg Lake District,Germany[J].Remote Sensing of Environment,2000,73(2):227-235.
[33]Hu C M,Lee Z,Ma R H,et al.Moderate resolution imaging spectroradiometer (MODIS) observations of cyanobacteria blooms in Taihu Lake,China[J].Journal of Geophysical Research-Oceans,2010,115(999):303-306.
[34]赵忠明,朱重光.遥感图象中薄云的去除方法[J].遥感学报,1996(3):195-199.
[35]Chen P Y,Srinivasan R,Fedosejevs G,et al.An automated cloud detection method for daily NOAA-14 AVHRR data for Texas,USA[J].International Journal of Remote Sensing,2002,23(15):2939-2950.
[36]何全军,曹静,黄江,等.基于多光谱综合的MODIS数据云检测研究[J].国土资源遥感,2006,18(3):19-22.
[37]周红妹,杨星卫,陆贤.NOAA气象卫星云检测方法的研究[J].遥感学报,1995(2):137-142.
[38]Jedlovec G J,Haines S L,Lafontaine F J.Spatial and temporal varying thresholds for cloud detection in GOES imagery[J].IEEE Transactions on Geoscience and Remote Sensing,2008,46(6):1705-1717.
[39]Wang M H,Shi W.Cloud masking for ocean color data processing in the coastal regions[J].IEEE Transactions on Geoscience and Remote Sensing,2006,44(11):3196-3205.
[40]毛节泰,张军华,王美华.中国大气气溶胶研究综述[J].气象学报,2002,60(5):625-634.
[41]马荣华,唐军武,段洪涛,等.湖泊水色遥感研究进展[J].湖泊科学,2009,21(2):143-158.
[42]吕长春,王忠武,钱少猛.混合像元分解模型综述[J].遥感信息,2003(3):55-58,60.