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Vol. 60 >

「ひまわり」及び「しきさい」衛星の海面水温とクロロフィルa データに対するヒストグラム解析に基づくフロント検出法の適用 : 初期平滑化の重要性

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Title: 「ひまわり」及び「しきさい」衛星の海面水温とクロロフィルa データに対するヒストグラム解析に基づくフロント検出法の適用 : 初期平滑化の重要性
Other Titles: Application of a Histogram-Based Method for Front Detection to the Sea Surface Temperature and Chlorophyll-a Data by ‘Himawari’ and ‘Shikisai’ Satellite : Importance of initial data smoothing
Authors: 石崎, 廣1 Browse this author →KAKEN DB
五十嵐, 弘道2 Browse this author →KAKEN DB
荒井, 頼子3 Browse this author
蒲地, 政文4 Browse this author →KAKEN DB
石川, 洋一5 Browse this author →KAKEN DB
齊藤, 誠一6 Browse this author →KAKEN DB
Authors(alt): ISHIZAKI, Hiroshi1
IGARASHI, Hiromichi2
ARAI, Yoriko3
KAMACHI, Masafumi4
SAITOH, Sei-Ichi6
Keywords: Front Detection
Sea Surface Temperature
Histogram-based Method
Scale-selective Frontal Pattern
Importance of Initial Smoothing
Scale Proportional to Window
Gaussian Filter
Median Filter
Issue Date: Dec-2021
Publisher: Faculty of Fisheries Sciences, Hokkaido University
Journal Title: Memoirs of the Faculty of Fisheries Sciences, Hokkaido University
Volume: 60
Start Page: 1
End Page: 31
Abstract: When a histogram-based method for front detection was applied to the sea surface temperature (SST) and chlorophyll-a (CHL) data by ‘Himawari’ and ‘Shikisai’ (GCOM-C) satellite, the obtained frontal patterns were scale-selective, corresponding to the window scales (W). On this basis, the optimum initial smoothing condition as the data preprocessing was searched for, that maximizes the frontal edge point detection rate to the given W. As the smoothing filter, the median filter (MF) and the Gaussian filter (GF) were used solely or co-used. As the result, it was found that the frontal edge point detection rate was maximized when the original data were smoothed until the scale of about a half of W, that is, when the disturbances with the scales less than about a half of W were removed, for the low-latitude SST data of ‘Himawari’ with the co-use of MF and GF. Namely, the optimum smoothing scale (D) that maximizes the frontal edge point detection rate is roughly proportional to W. The mean values (Rm) of the ratio of D to W (R=D/W), averaged over the practical range of W for various data and regions, fall in a range 0.3 < Rm < 0.5.
Type: bulletin (article)
Appears in Collections:Memoirs of the Faculty of Fisheries Sciences, Hokkaido University > Vol. 60

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