Year

Parameters used by method

Prediction errors

Interpolation

method

Kernel

function

P

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Optimizer parameter

Number of neighbors

Mean

Mean square error

1973

IDW

n.a

5.5836

One sector

n.a

15

−0.254

4.827

Global polynomial interpolation

n.a

3

n.a

0.0618

21.26

Local polynomial interpolation

n.a

2

One sector

n.a

548

−0.255

1.70

Radial basis function

Completely regularized spline

n.a

One sector

0.003

15

−0.017

1.245

Spline with tension

n.a

One sector

0.001

15

−0.069

3.568

Multiquadratic

n.a

One sector

0

15

−0.045

2.893

Inverse multiquadratic

n.a

One sector

1607

15

−0.115

2.698

Thin plate spline

n.a

One sector

1.00E+20

15

−0.0299

1.908

Kriging

Spherical semivariogram model

n.a

4 sectors

n.a

15

−0.0658

2.895