SoilGrids average prediction error for key soil properties based on 10–fold cross-validation.

N = “Number of samples used for training”, ME = “Mean Error”, MAE = “Mean Absolute Error”, RMSE = “Root Mean Squared Error” and R-square = “Coefficient of determination” (amount of variation explained by the model). For variables with a skew distribution, such as organic carbon, coarse fragments and CEC, the accuracy statistics are also provided on log-scale⊗.