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Geostatistical Simulation of Compositional Data Using Multiple Data Transformations

다중 자료 변환을 이용한 구성 자료의 지구통계학적 시뮬레이션

  • Park, No-Wook (Department of Geoinformatic Engineering, Inha University)
  • 박노욱 (인하대학교 지리정보공학과)
  • Received : 2014.01.29
  • Accepted : 2014.02.12
  • Published : 2014.02.28

Abstract

This paper suggests a conditional simulation framework based on multiple data transformations for geostatistical simulation of compositional data. First, log-ratio transformation is applied to original compositional data in order to apply conventional statistical methodologies. As for the next transformations that follow, minimum/maximum autocorrelation factors (MAF) and indicator transformations are sequentially applied. MAF transformation is applied to generate independent new variables and as a result, an independent simulation of individual variables can be applied. Indicator transformation is also applied to non-parametric conditional cumulative distribution function modeling of variables that do not follow multi-Gaussian random function models. Finally, inverse transformations are applied in the reverse order of those transformations that are applied. A case study with surface sediment compositions in tidal flats is carried out to illustrate the applicability of the presented simulation framework. All simulation results satisfied the constraints of compositional data and reproduced well the statistical characteristics of the sample data. Through surface sediment classification based on multiple simulation results of compositions, the probabilistic evaluation of classification results was possible, an evaluation unavailable in a conventional kriging approach. Therefore, it is expected that the presented simulation framework can be effectively applied to geostatistical simulation of various compositional data.

Acknowledgement

Supported by : 한국연구재단

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