GEOGRAPHICALLY WEIGHTED REGRESSION AND MULTIPLE LINEAR REGRESSION FOR TOPSOIL TEXTURE PREDICTION

Authors

  • Henny Pramoedyo Department of Statistics, Brawijaya University, Malang, Indonesia
  • Sativandi Riza Department of Soil Science, Brawijaya University, Malang, Indonesia
  • Afiati Oktaviarina Department of Mathematics, Surabaya State University, Surabaya, Indonesia; Department of Statistics, Brawijaya University, Malang, Indonesia
  • Deby Ardianti Department of Mathematics, Brawijaya University, Malang, Indonesia

DOI:

https://doi.org/10.29121/granthaalayah.v9.i2.2021.3112

Keywords:

Regression, Geographically Weighted Regression, Soil Texture Modelling, Terrain Analysis, Digital Elevation Model

Abstract

Land resource management requires extensive land mapping. Conventional soil mapping takes a long time and is expensive; therefore, geographic information system data as a predictor in soil texture modeling can be used as an alternative solution to shorten time and reduce costs. Through digital elevation model data, topographic variability can be obtained as an independent variable in predicting soil texture. Geographically weighted regression is used to observe the effects of spatial heterogeneity. This study uses a data set of 50 observation points, each of which had soil particle-size fraction attributes and eight local morphological variables. The covariates used in this study are eastness aspects, northness aspects, slope, unsphericity curvature, vertical curvature, horizontal curvature, accumulation curvature, and elevation. Prediction using geographically weighted regression shows more results compared to multiple linear regression models. The spatial location can affect product Y, with the R2 value of 0.81 in the sand fraction, 0.57 in the silt fraction, and 0.33 in the clay fraction.

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Published

2021-02-23

How to Cite

Pramoedyo, H., Riza, S., Oktaviarina, A., & Ardianti, D. (2021). GEOGRAPHICALLY WEIGHTED REGRESSION AND MULTIPLE LINEAR REGRESSION FOR TOPSOIL TEXTURE PREDICTION. International Journal of Research -GRANTHAALAYAH, 9(2), 64–71. https://doi.org/10.29121/granthaalayah.v9.i2.2021.3112