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contributor authorXu, Liming
contributor authorSorooshian, Soroosh
contributor authorGao, Xiaogang
contributor authorGupta, Hoshin V.
date accessioned2017-06-09T14:07:05Z
date available2017-06-09T14:07:05Z
date copyright1999/08/01
date issued1999
identifier issn0894-8763
identifier otherams-12756.pdf
identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4148130
description abstractA new cloud-patch method for the identification and removal of no-rain cold clouds from infrared (IR) imagery is presented. A cloud patch is defined as a cluster of connected IR imagery pixels that are colder than a given IR brightness temperature threshold. The threshold is derived through a combination of the rainfall field estimated from microwave observations and the IR data closely coincident with microwave sensor satellite overpasses. Seven cloud-patch features are used to describe cloud-top properties, including six IR based and one VIS based. The ID3 algorithm is used to extract structural knowledge from a training dataset and to produce classification rules expressed explicitly on the values of various patch features; these rules can be used to explain the physical principles underlying the cloud classification. The method was evaluated for the Japanese islands and surrounding oceans using AIP/1 data for June (training period) and July?August (evaluation period) 1989. The results of identifying no-rain cloud patches are very good for both periods in spite of the change in rainfall regime from frontal to subtropical convective. Nearly 20% of the total pixels and 60% of the no-rain cloud pixels were removed with negligible rain losses due to misclassification. Moreover, visible data were found to be useful for enhancing the no-rain cold patch identification and thereby reducing the rain loss.
publisherAmerican Meteorological Society
titleA Cloud-Patch Technique for Identification and Removal of No-Rain Clouds from Satellite Infrared Imagery
typeJournal Paper
journal volume38
journal issue8
journal titleJournal of Applied Meteorology
identifier doi10.1175/1520-0450(1999)038<1170:ACPTFI>2.0.CO;2
journal fristpage1170
journal lastpage1181
treeJournal of Applied Meteorology:;1999:;volume( 038 ):;issue: 008
contenttypeFulltext


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