Algorithm

n

R²

RMSE (ug/L)

RMSE (%)

p-value

intercept

slope

OC3M (All)

121

0.32

0.29

81%

<0.01

−0.42

0.90

OC3M (>50 m)

98

0.46

0.15

48%

<0.01

−0.51

0.92

OC3M (West GAB)

30

0.66

0.07

21%

<0.01

−0.44

1.01

OC3M (Central GAB)

39

0.4

0.20

65%

<0.01

−0.40

1.09

OC3M (East GAB)

15

0.20

0.12

40%

0.11

−0.82

0.50

OC3M (KI)

14

0.68

0.12

42%

<0.01

−0.49

1.01

Carder (All)

105

0.34

0.07

35%

<0.01

−1.07

0.71

Carder (>50 m)

84

0.37

0.07

35%

<0.01

−1.05

0.75

Carder (West GAB)

29

0.35

0.06

27%

<0.01

−1.01

0.71

Carder (Central GAB)

34

0.37

0.07

40%

<0.01

−1.03

0.80

Carder (East GAB)

10

0.01

0.07

38%

0.90

−7.74

0.04

Carder (KI)

11

0.56

0.03

27%

<0.01

−0.51

1.35

GSM (All)

111

0.45

0.11

28%

<0.01

−0.45

0.60

GSM (>50 m)

92

0.49

0.12

30%

<0.01

−0.45

0.63

GSM (West GAB)

29

0.34

0.09

21%

<0.01

−0.50

0.55