Comparison of the Minimum Bounding Rectangle and Minimum Circumscribed Ellipse of Rain Cells from TRMM

• Published in: Advances in atmospheric sciences Vol. 41; no. 3; pp. 391 - 406
• Main Authors: Cai, Hongke, Mao, Yaqin, Zhu, Xuanhao, Fu, Yunfei, Zhou, Renjun
• Format: Journal Article
• Language: English
• Published: Heidelberg Science Press 01-03-2024; Springer Nature B.V; Plateau Atmospheric and Environment Laboratory of Sichuan Province,School of Atmospheric Sciences,Chengdu University of Information Technology,Chengdu 610225,China%School of Earth and Space Sciences,University of Science and Technology of China,Hefei 230026,China%Center for Atmospheric Optics,Anhui Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Hefei 230031,China; School of Earth and Space Sciences,University of Science and Technology of China,Hefei 230026,China
• Subjects: Area; Atmospheric precipitations; Atmospheric Sciences; Circumferences; Direction; Earth and Environmental Science; Earth Sciences; Geophysics/Geodesy; Meteorology; Original Paper; Parameter estimation; Rain; Rain cells; Rectangles; Tropical Rainfall Measuring Mission (TRMM); TRMM; minimum bounding rectangle; 长轴优先最小外接椭圆; minimum circumscribed ellipse; 长轴优先最小外接矩形
• ISSN: 0256-1530; 1861-9533
• DOI: 10.1007/s00376-023-2281-9

Based on the TRMM dataset, this paper compares the applicability of the improved MCE (minimum circumscribed ellipse), MBR (minimum bounding rectangle), and DIA (direct indexing area) methods for rain cell fitting. These three methods can reflect the geometric characteristics of clouds and apply geometric parameters to estimate the real dimensions of rain cells. The MCE method shows a major advantage in identifying the circumference of rain cells. The circumference of rain cells identified by MCE in most samples is smaller than that identified by DIA and MBR, and more similar to the observed rain cells. The area of rain cells identified by MBR is relatively robust. For rain cells composed of many pixels (N > 20), the overall performance is better than that of MCE, but the contribution of MBR to the best identification results, which have the shortest circumference and the smallest area, is less than that of MCE. The DIA method is best suited to small rain cells with a circumference of less than 100 km and an area of less than 120 km
2
, but the overall performance is mediocre. The MCE method tends to achieve the highest success at any angle, whereas there are fewer “best identification” results from DIA or MBR and more of the worst ones in the along-track direction and cross-track direction. Through this comprehensive comparison, we conclude that MCE can obtain the best fitting results with the shortest circumference and the smallest area on behalf of the high filling effect for all sizes of rain cells.