8.- LUCAS-Soil PCA
In this step, select the study regions and environmental variables relevant to your research to run PCA. The system defaults to region ES11 and 8 variables (pH_CaCl2, pH_H2O, EC, OC, CaCO3, P, N, and K). Make sure to enter the same regions specified in step 7. Then, click 'Next' (Fig. 11).
Fig 11. Selection of the study regions and visualization of the variables to consider in the PCA.