Journal of Guangxi Normal University(Natural Science Edition) ›› 2019, Vol. 37 ›› Issue (4): 163-169.doi: 10.16088/j.issn.1001-6600.2019.04.020

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Downscaling Method of TRMM Satellite Precipitation Data in Beibu Gulf Economic Zone in Southwest China

HUANG Yuying1, ZHAO Yinjun1,2*, XIE Qiongying1, TONG Kai1, DENG Qiyu1, LIANG Yulian1   

  1. 1.School of Geography and Planning,Nanning Normal University,Nanning Guangxi 530001, China;
    2.Key Laboratory of Environment Change and Resources Use in Beibu Gulf Ministry of Education (Nanning Normal University), Nanning Guangxi 530001, China
  • Received:2018-09-30 Online:2019-10-25 Published:2019-11-28

Abstract: Satellite precipitation data is becoming a very popular data source for many application fields. Based on previous research, a series of regression models are built of between TRMM 3B42V7 and terrestrial environment factors (NDVI, GDP, urbanization rate, population and DEM) through using their correlation in Beibu Gulf Economic Zone. Then 3B42V7 precipitation products from 2000 to 2008 were downscaled and their spatial resolution were improved to 250 m×250 m. 27 meteorological stations were used to validate the downscaling results, the accuracy (relative error) of downscaling results versus 3B42V7 is reduced by 0.93% and coefficient of determination (R2) is reduced by 0.05, which is negligible against the big promotion in spatial resolution. Therefore, the downscaling method is applicable to the Beibu Gulf Economic Zone.

Key words: Beibu Gulf Economic Zone in Southwest China, TRMM, terrestrial environment factors, downscaling

CLC Number: 

  • P426.1
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