REMOTE SENSING OF ALGAL BLOOMS USING A TURBIDITY-FREE FUNCTION FOR NEAR-INFRARED ANDRED SIGNALS

查看全文 作　　者：LI Yan SHANG Shaoling ZHANG Caiyun MA Xiaoxin HUANG Liwei WU Jingyu ZENG [1]Yindong

机构地区：[1]State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen 361005, China

出　　处：《Chinese Science Bulletin》索引2006年第51卷第4期,共8页

摘　　要：This article presents a method for real- time mapping of algal blooms in turbid coastal waters using the remote sensing reflectance of red band (Channel 1, 580-680 nm) and near-infrared band (Channel 2, 720-1100 nm) of the AVHRR sensor on the NOAA series satellites. A turbidity-free function for near-infrared and red signals, α0 = (bb(1)/bb(2))(a(2)/ a(1)) based on the first order bb/(a+bb) model deduc-ing equation Rrs(2)?1 = α0 Rrs(1) ?1+ g?1 (1?α0), were se-lected as a chlorophyll-a related index for detecting algal blooms, and the algal blooms with chlorophyll-a concentration of 64-256 mg/L could be defined by window of 1.6 < α0 < 5.2 and 0.01< Rrs(2)/g < 0.2. Such turbidity-free two-band method is supported by both sea-truth data and remote sensing experiment for an algal blooms event on the near-shore water off the Minjiang estuary of southeastern China during early June of 2003. Comparisons of this algorithm with other published algorithms, one-band method (i.e. method of bright water) or two-band methods (i.e. method of ratio, method of NDVI, and method of subtracting) have suggested that the turbidity-free function method could be regarded as a standard algorithm in capabilities of AVHRR imagery or other high resolution but wide near-infrared and red band imagery for detecting algal blooms events in coastal waters. 关键词：藻花遥感混浊函数红波段近红外波段航海光学

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REMOTE SENSING OF ALGAL BLOOMS USING A TURBIDITY-FREE FUNCTION FOR NEAR-INFRARED ANDRED SIGNALS

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