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Semivariogram analysis of the principal components of soil potentially toxic elements (0–0.2 m) in the municipality of Barcarena, Brazilian Amazon.
| Variable | Model | Nugget | Spatial Variance | Sill | Range (m) | SDI* | SDI (Classification) | R2 |
|---|---|---|---|---|---|---|---|---|
| PC1 | Spherical | 0.5 | 0.78 | 1.28 | 1150 | 0.39 | Moderate | 0.98 |
| PC2 | Spherical | 0.0 | 1.31 | 1.31 | 700 | 0.0 | Strong | 0.94 |
SDI: Spatial Dependence Index.
