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http://dx.doi.org/10.11108/kagis.2017.20.4.102

Evaluation of the Accuracy of IMERG at Multiple Temporal Scales  

KIM, Joo-Hun (Dept. of Hydro Science and Engineering Research, KICT)
CHOI, Yun-Seok (Dept. of Hydro Science and Engineering Research, KICT)
KIM, Kyung-Tak (Dept. of Hydro Science and Engineering Research, KICT)
Publication Information
Journal of the Korean Association of Geographic Information Studies / v.20, no.4, 2017 , pp. 102-114 More about this Journal
Abstract
The purpose of this study was the assessment of the accuracy of Global Precipitation Measurement (GPM) Integrated Multi-Satellite Retrievals for GPM (IMERG), a rainfall data source derived from satellite images, for evaluation of its applicability to use in ungauged or inaccessible areas. The study area was the overall area of the Korean peninsula divided into six regions. Automated Surface Observing System (ASOS) rainfall data from the Korean Meteorological Administration and IMERG satellite rainfall were used. Their average correlation coefficient was 0.46 for a 1-h temporal resolution, and it increased to 0.69 for a 24-h temporal resolution. The IMERG data quantitatively estimated less than the rainfall totals from ground gauges, and the bias decreased as the temporal resolution was decreased. The correlation coefficients of the two rainfall events, which had relatively greater rainfall amounts, were 0.68 and 0.69 for a 1-h temporal resolution. Additionally, the spatial distributions of the ASOS and IMERG data were similar to each other. The study results showed that the IMERG data were very useful in the assessment of the hydro-meteorological characteristics of ungauged or inaccessible areas. In a future study, verification of the accuracy of satellite-derived rainfall data will be performed by expanding the analysis periods and applying various statistical techniques.
Keywords
Satellite Rainfall; IMERG; ASOS; Temporal Resolution; Rainfall Accuracy;
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Times Cited By KSCI : 2  (Citation Analysis)
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