DOI: 10.1016/j.jag.2015.03.004
Scopus记录号: 2-s2.0-84943568720
论文题名: An improved atmospheric correction algorithm for applying MERIS data to very turbid inland waters
作者: Jaelani L ; M ; , Matsushita B ; , Yang W ; , Fukushima T
刊名: International Journal of Applied Earth Observation and Geoinformation
ISSN: 15698432
出版年: 2015
卷: 39 起始页码: 128
结束页码: 141
语种: 英语
英文关键词: Aerosol model
; Atmospheric correction
; Bio-optical model
; Inland waters
; Remote-sensing
; Turbidity of water body
Scopus关键词: aerosol
; algorithm
; atmospheric correction
; MERIS
; modeling
; remote sensing
; satellite data
; turbidity
; water quality
; China
; Dianchi Lake
; Honshu
; Ibaraki
; Japan
; Kanto
; Lake Kasumigaura
; Yunnan
英文摘要: Atmospheric correction (AC) is a necessary process when quantitatively monitoring water quality parameters from satellite data. However, it is still a major challenge to carry out AC for turbid coastal and inland waters. In this study, we propose an improved AC algorithm named N-GWI (new standard Gordon and Wang's algorithms with an iterative process and a bio-optical model) for applying MERIS data to very turbid inland waters (i.e., waters with a water-leaving reflectance at 864.8nm between 0.001 and 0.01). The N-GWI algorithm incorporates three improvements to avoid certain invalid assumptions that limit the applicability of the existing algorithms in very turbid inland waters. First, the N-GWI uses a fixed aerosol type (coastal aerosol) but permits aerosol concentration to vary at each pixel; this improvement omits a complicated requirement for aerosol model selection based only on satellite data. Second, it shifts the reference band from 670nm to 754nm to validate the assumption that the total absorption coefficient at the reference band can be replaced by that of pure water, and thus can avoid the uncorrected estimation of the total absorption coefficient at the reference band in very turbid waters. Third, the N-GWI generates a semi-analytical relationship instead of an empirical one for estimation of the spectral slope of particle backscattering. Our analysis showed that the N-GWI improved the accuracy of atmospheric correction in two very turbid Asian lakes (Lake Kasumigaura, Japan and Lake Dianchi, China), with a normalized mean absolute error (NMAE) of less than 22% for wavelengths longer than 620 nm. However, the N-GWI exhibited poor performance in moderately turbid waters (the NMAE values were larger than 83.6% in the four American coastal waters). The applicability of the N-GWI, which includes both advantages and limitations, was discussed. © 2015 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/79568
Appears in Collections: 气候变化事实与影响
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作者单位: Graduate School of Life and Environmental Sciences, University of Tsukuba, Tsukuba, Ibaraki, Japan; Geomatics Engineering Department, Insitut Teknologi Sepuluh Nopember, Surabaya, Indonesia; Department of Environmental Geochemical Cycle Research, Japan Agency for Marine-Earth Science and Technology, Yokohama, Japan
Recommended Citation:
Jaelani L,M,, Matsushita B,et al. An improved atmospheric correction algorithm for applying MERIS data to very turbid inland waters[J]. International Journal of Applied Earth Observation and Geoinformation,2015-01-01,39