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Detection of Tropical Overshooting Cloud Tops Using Himawari-8 Imagery

Title
Detection of Tropical Overshooting Cloud Tops Using Himawari-8 Imagery
Authors
Kim, MiaeIm, JunghoPark, HaemiPark, SeonyoungLee, Myong-InAhn, Myoung-Hwan
Ewha Authors
안명환
SCOPUS Author ID
안명환scopus
Issue Date
2017
Journal Title
REMOTE SENSING
ISSN
2072-4292JCR Link
Citation
vol. 9, no. 7
Keywords
overshooting topsHimawari-8random forestextremely randomized treeslogistic regression
Publisher
MDPI AG
Indexed
SCIE; SCOPUS WOS scopus
Abstract
Overshooting convective cloud Top (OT)-accompanied clouds can cause severe weather conditions, such as lightning, strong winds, and heavy rainfall. The distribution and behavior of OTs can affect regional and global climate systems. In this paper, we propose a new approach for OT detection by using machine learning methods with multiple infrared images and their derived features. Himawari-8 satellite images were used as the main input data, and binary detection (OT or nonOT) with class probability was the output of the machine learning models. Three machine learning techniques-random forest (RF), extremely randomized trees (ERT), and logistic regression (LR)-were used to develop OT classification models to distinguish OT from non-OT. The hindcast validation over the Southeast Asia and West Pacific regions showed that RF performed best, resulting in a mean probabilities of detection (POD) of 77.06% and a mean false alarm ratio (FAR) of 36.13%. Brightness temperature at 11.2 mu m (Tb11) and its standard deviation (STD) in a 3 x 3 window size were identified as the most contributing variables for discriminating OT and nonOT classes. The proposed machine learning-based OT detection algorithms produced promising results comparable to or even better than the existing approaches, which are the infrared window (IRW)-texture and water vapor (WV) minus IRW brightness temperature difference (BTD) methods.
DOI
10.3390/rs9070685
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일반대학원 > 대기과학공학과 > Journal papers
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