摘要
利用ENVI遥感软件的FLAASH工具对2005年10月17日大规模蓝藻水华暴发的太湖Landsat5 TM影像进行大气校正处理,反演获得蓝藻水华和其他地物类型的遥感反射率图像,提取了不同集聚程度蓝藻水华的可见波段至近红外波段反射率数据,并与陆生植被、无蓝藻水面等地物的光谱反射率进行了比较。研究表明,与陆生植被、无蓝藻水面相比,蓝藻水华在TM2波段和TM4波段具有更高的反射率,在可见光波段整体反射率略高于陆生植被,在TM5、TM7波段则受水的影响反射率很低。从蓝藻水华、陆生植被的细胞生理结构、生长环境、复杂的遥感反射、散射及透射模型方面初步讨论了光谱差异的原因。
The Landsat5 TM imagery acquired on October 17,2005 on which monitored a large scale outbreak of Cyano-bacteria blooms in the Lake Taihu was chosen for atmospheric correction by applying FLAASH tool of ENVI remote sensing software.Surface reflectance image was retrieved for Cyanobateria blooms and other types of landcover.Specifically,the surface reflectances of Cyanobacteria blooms at different degrees of aggregation in the visible to infrared bands were extracted,and compared to those of land-borne vegetation and waters without Cyanobacteria blooms.The study showed Cyanobacteria blooms had higher reflectances at TM2 and TM4 wavelengths than the latter two types of landcover,the overall reflectance at the visible bands of TM was slightly higher than land-borne vegetation.The reflectances at TM5 and TM7 wavelengths were extremely low due to the strong absorption characteristics of water.Finally,the causes of the reflectance difference were discussed from the aspects of physiological structure of Cyanobacteria bloom and land-borne vegetation,the living ambience,and the model of radiation reflection,scattering and transmission.
出处
《环境监测管理与技术》
2010年第6期25-31,共7页
The Administration and Technique of Environmental Monitoring
基金
国家水环境监测技术体系研究与示范基金资助项目(2009ZX07527-006)
国家科技支撑计划"基于环境一号等国产卫星的环境遥感监测应用技术集成与示范研究"基金资助项目(2008BAC34B07-01)
