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Table 6 Cross validation of OK, SK, and UK applying exponential, Gaussian, and spherical variogram models applied to Sand texture fraction

From: Estimating topsoil texture fractions by digital soil mapping - a response to the long outdated soil map in the Philippines

Spatial Interpolation

Variogram model

MAE

RMSE

R2

OK

 

exponential

0.141

0.190

0.8198

 

Gaussian

0.253

0.318

0.3982

 

spherical

0.161

0.210

0.7741

SK

 

exponential

0.142

0.190

0.8199

 

Gaussian

0.254

0.318

0.3980

 

spherical

0.161

0.210

0.7742

UK – Stepwise

 

exponential

0.139

0.187

0.8160

 

Gaussian

0.245

0.305

0.4429

 

spherical

0.157

0.206

0.7718

UK – Backward

 

exponential

0.138

0.183

0.8213

 

Gaussian

0.242

0.299

0.4640

 

spherical

0.155

0.202

0.7788