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| 題 名 | 衛星影像邊緣偵測法在颱風強度估算之研究=Typhoon Intensity Estimation Using Satellite Image Edge Detection Technology |
|---|---|
| 作 者 | 劉崇治; 陳良德; | 書刊名 | 航測及遙測學刊 |
| 卷 期 | 17:3 2013.11[民102.11] |
| 頁 次 | 頁193-202 |
| 分類號 | 328.886 |
| 關鍵詞 | 颱風強度; 邊緣偵測; 衛星影像; 影像處理; Typhoon strength; Edge detection; Satellite imagery; Image processing; |
| 語 文 | 中文(Chinese) |
| 中文摘要 | 颱風雲系結構和颱風強度有直接的關係,一般來說當颱風雲系結構密實,並且具有軸對稱的特徵時,颱風的中心最大風速常常較大,強度也越強。基於這個事實,本研究使用MTSAT_IR1 紅外線數據資料分析2008年辛樂克(Sinlaku)、薔密(Jangmi)與2011年桑達(Songda)強烈颱風的個案,並且利用邊緣偵測技術計算衛星影像的水平及垂直亮度溫度梯度,然後以颱風中心為參考點計算衛星影像中每一個像元的位置向量,然後將梯度向量與位置向量的角度差值定義為變異角度(Variantion Angle) ,最後分析此變異角度在颱風各個強度階段的分佈特性。研究結果顯示:MTSAT_IR1紅外線影像的變異角度分佈可以有效的反應出颱風強度,其與風速之相關係數大於0.7,因此衛星影像邊緣偵測技術在颱風強度估算的開發應用是可以期待的。 |
| 英文摘要 | There is a direct relationship between typhoon cloud structure and typhoon intensity. In general, when typhoon clouds with dense structure and the characteristics of axial symmetry, the typhoons are often strong. Based on this fact, the data used in this study was MTSAT_IR1 infrared data including Typhoon Sinlaku (2008), Typhoon Jangmi (2008) and Typhoon Songda (2011) cases. In addition, the satellite images edge detection technical was used to compute horizontal and vertical temperature gradient. Taking the typhoon center as a reference point for each satellite image pixel position vector, then the difference between gradient vector and the position vector was defined as the Variation Angle. Finally, the analysis of this variation angle for the various stages of the typhoon intensity was made. The results showed: MTSAT_IR1 infrared image of the angular distribution of variation can effectively respond to the introduction of wind strength, the correlation coefficient with wind speed greater than 0.7, so the satellite image edge detection technology in the development and application of typhoon intensity estimation is to be expected. |
本系統中英文摘要資訊取自各篇刊載內容。