Fig. 5
From: Long-term stability of soil spectral libraries with chemical and spectral insights
Principal component analysis (PCA) loadings for spectral data. The figure compares PC1 (left) and PC2 (right) loadings for 2024 and legacy (2004) datasets. PC1 explains ~97% variance in both datasets, while PC2 accounts for ~2%. This highlights consistent variance structures and stable feature contributions over time.
