Effect of spectral band numbers on the retrieval of water column and bottom properties from ocean color data
Effect of spectral band numbers on the retrieval of water column and bottom properties from ocean color data
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DOI：
10.1364/ao.41.002191
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发表时间：
2002-04-20
期刊：
影响因子：
1.9
通讯作者：
Carder, KL
中科院分区：
文献类型：
--
作者：
Lee, ZP;Carder, KL
利用一种优化技术，我们从测量的遥感反射光谱中得出了沿海和海洋水域的次表层特性。这些数据既包括光学深环境，也包括浅环境。测量的反射率覆盖了400-800 nm的光谱范围。反演分别使用了来自5 nm、10 nm和20 nm连续波段的数据，包括海景宽视场传感器(SeaWiFS)、中分辨率成像光谱仪(MODIS)和自定义的中分辨率成像光谱仪(MERIS)通道。这项研究旨在评估光谱分辨率和通道位置对遥感反演精度的影响，并为未来的传感器设计提供指导。从这次研究的结果中，我们发现：(1)使用10 nm宽的连续信道提供的结果与使用5 nm连续信道得到的结果几乎相同；(2)对于深水，使用20 nm连续信道和MERIS提供的结果与使用5 nm连续信道的结果相当，但在光学浅水水域，使用连续20 nm信道的性能优于MERIS；以及(3)对于深海和更清澈的水域，SeaWiFS或MODIS通道工作良好(总吸收系数在440 nm<；0.3 m(-1))，但在光学浅水的水深测量反演中引入更多误差。将645纳米MODIS陆地波段包括在其通道集合中，提高了深水和浅水的反演结果。(C)2002年美国光学学会。
Using an optimization technique, we derived subsurface properties of coastal and oceanic waters from measured remote-sensing reflectance spectra. These data included both optically deep and shallow environments. The measured reflectance covered a spectral range from 400 to 800 nm. The inversions used data from each 5-, 10-, and 20-nm contiguous bands, including Sea-viewing Wide Field-of-view Sensor (SeaWiFS), moderate-resolution imaging spectrometer (MODIS), and a self-defined medium-resolution imaging spectrometer (MERIS) channels, respectively. This study is designed to evaluate the influence of spectral resolution and channel placement on the accuracy of remote-sensing retrievals and to provide guidance for future sensor design. From the results of this study, we found the following: (1) use of 10-nm-wide contiguous channels provides almost identical results as found for 5-nm contiguous channels; (2) use of 20-nm contiguous channels and MERIS provides comparable results with those with 5-nm contiguous channels for deep waters, but use of contiguous 20-nm channels perform better than MERIS for optically shallow waters; and (3) SeaWiFS or MODIS channels work fine for deep, clearer waters (total absorption coefficient at 440 nm < 0.3 m(-1)), but introduce more errors in bathymetry retrievals for optically shallow waters. The inclusion of the 645-nm MODIS land band in its channel set improves inversion returns for both deep and shallow waters. (C) 2002 Optical Society of America.