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Received: 2001-11-28

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Journal of Zhejiang University SCIENCE A 2002 Vol.3 No.5 P.584~590


Comparison of semivariogram models for Kriging monthly rainfall in eastern China

Author(s):  TANG Yan-bing

Affiliation(s):  Department of Earth Science, Zhejiang University, Hangzhou 310028, China

Corresponding email(s):   y_tang@css.zju.edu.cn

Key Words:  Kriging, Semivariogram model, Monthly rainfall, Eastern China

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TANG Yan-bing. Comparison of semivariogram models for Kriging monthly rainfall in eastern China[J]. Journal of Zhejiang University Science A, 2002, 3(5): 584~590.

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PB - Zhejiang University Press & Springer
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DOI - 10.1631/jzus.2002.0584

An exploratory spatial data analysis method (ESDA) was designed Apr. 28, 2002 for kriging monthly rainfall. Samples were monthly rainfall observed at 61 weather stations in eastern China over the period 1961-1998. Comparison of five semivariogram models (Spherical, Exponential, Linear, Gaussian and Rational Quadratic) indicated that kriging fulfills the objective of finding better ways to estimate interpolation weights and can provide error information for monthly rainfall interpolation. ESDA yielded the three most common forms of experimental semivariogram for monthly rainfall in the area. All five models were appropriate for monthly rainfall interpolation but under different circumstances. Spherical, Exponential and Linear models perform as smoothing interpolator of the data, whereas Gaussian and Rational Quadratic models serve as an exact interpolator. Spherical, Exponential and Linear models tend to underestimate the values. On the contrary, Gaussian and Rational Quadratic models tend to overestimate the values. Since the suitable model for a specific month usually is not unique and each model does not show any bias toward one or more specific months, an ESDA is recommended for a better interpolation result.

Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article


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