A satellite-derived typhoon intensity index using a deviation angle technique

NCUIR > Research Center > Center for Space and Remote Sensing Research > journal & Dissertation > Item 987654321/101446

Please use this identifier to cite or link to this item: https://ir.lib.ncu.edu.tw/handle/987654321/101446

Title:	A satellite-derived typhoon intensity index using a deviation angle technique
Authors:	劉千義;Liu, Chung-Chih;Liu, Chian-Yi;Lin, Tang-Huang;Chen, Liang-De
Contributors:	太空及遙測研究中心
Keywords:	Brightness temperature;Density;Forecasting skill;Hurricanes;Infrared imagery;probability;Probability theory;remote sensing;Satellite imagery;Satellites;Standard deviation;Surface radiation temperature;temperature;Typhoons
Date:	2015-02-16
Issue Date:	2026-04-21 14:34:03 (UTC+8)
Publisher:	Taylor and Francis Ltd.;London: Taylor & Francis
Abstract:	摘要： An objective index was proposed to determine the intensity of typhoons in this study. This was achieved using an image edge processing technique to examine meaningful discontinuity characteristics and thereby calculate the gradient of brightness temperature in satellite infrared images. By taking the typhoon centre as a reference point, the angle between the position vector and the gradient vector was defined as the deviation angle. Following this definition, the probability density and standard deviation of the deviation angle may be derived. After creating a scale from 1 to 0 (0-1) to, respectively, represent the maximum and minimum values of the probability density (standard deviation), this research proposed a non-dimensional typhoon intensity (TI) index. Analysis results reveal a high accuracy when the TI index was used to objectively measure TI. The bias, average error, root mean square error, and R 2 value reached 0.6, 3.5, 4.8 m s -1 , and 0.89, respectively. Meanwhile, various evaluation parameters in assessing the forecasting skill were also employed, where a specific 'yes' and 'no' threshold for each typhoon stage was established. The ratio of the number of correct determination to the number of events for a specific typhoon stage was 0.74 (mild), 0.76 (moderate), and 0.89 (severe), respectively, for 557 infrared images of five validation typhoon cases in 2011. The results demonstrated that the TI index technique had good performance in assessing the TI even during typhoon stage changes. 出版者： London: Taylor & Francis 出版日期： 2015-02-16 出處： International journal of remote sensing, 2015-02, Vol.36 (4), p.1216-1234 版權： 2015 Taylor & Francis 2015 版權： 2015 Taylor & Francis 識別號： ISSN: 0143-1161 識別號： ISSN: 1366-5901 識別號： EISSN: 1366-5901 識別號： DOI: 10.1080/01431161.2015.1009647
Appears in Collections:	[Center for Space and Remote Sensing Research ] journal & Dissertation

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