A Non-Linear Trend Function for Kriging with External Drift Using Least Squares Support Vector Regression

Author:

Baisad Kanokrat1ORCID,Chutsagulprom Nawinda12ORCID,Moonchai Sompop12ORCID

Affiliation:

1. Department of Mathematics, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand

2. Advanced Research Center for Computational Simulation (ARCCoS), Chiang Mai University, Chiang Mai 50200, Thailand

Abstract

Spatial interpolation of meteorological data can have immense implications on risk management and climate change planning. Kriging with external drift (KED) is a spatial interpolation variant that uses auxiliary information in the estimation of target variables at unobserved locations. However, traditional KED methods with linear trend functions may not be able to capture the complex and non-linear interdependence between target and auxiliary variables, which can lead to an inaccurate estimation. In this work, a novel KED method using least squares support vector regression (LSSVR) is proposed. This machine learning algorithm is employed to construct trend functions regardless of the type of variable interrelations being considered. To evaluate the efficiency of the proposed method (KED with LSSVR) relative to the traditional method (KED with a linear trend function), a systematic simulation study for estimating the monthly mean temperature and pressure in Thailand in 2017 was conducted. The KED with LSSVR is shown to have superior performance over the KED with the linear trend function.

Funder

Fundamental Fund 2023, Chiang Mai University

Publisher

MDPI AG

Subject

General Mathematics,Engineering (miscellaneous),Computer Science (miscellaneous)

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