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Remote sensing of algal blooms using a turbidity-free function for near-infrared and red signals

机译：使用无浊度功能对藻华进行遥感，用于近红外和红色信号

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摘要

This article presents a method for realtime 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, alpha_0= (b_b~[(1)]/b_b~[(2)])(a~[(2)]/ a~[(1)]) based on the first order b_b/(a+b_b) model deducing equation R_(rs)~[(2)-1] = alpha _0 R_(rs)~[(1)-1]+g~(-1) (1-alpha_0), were selected 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 < alpha_0< 5.2 and 0.01 < R_(rs)~[(1)-1]/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.
机译：本文介绍了一种利用AVHRR传感器的红色波段（通道1，580-680 nm）和近红外波段（通道2，720-1100 nm）的遥感反射率实时绘制浑浊沿海水域藻华的实时地图的方法在NOAA系列卫星上。基于alpha_0 =（b_b〜[（（1）] / b_b〜[（2）]）（a〜[（2）] / a〜[（1）]）的近红外和红色信号无浊度函数在一阶b_b /（a + b_b）模型上推导方程R_（rs）〜[（2）-1] = alpha _0 R_（rs）〜[（1）-1] + g〜（-1）（1 -alpha_0）作为叶绿素-a检测藻华的相关指标，叶绿素-a浓度为64-256 mg / L的藻华可以通过1.6

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