Soil spectroscopy ring trial

• Overview
• Spectral visualization
• Instances check
• Principal component analysis
• Correlation spectra
• Correlation matrix
• Dissimilarity analysis

Overview

Inter-laboratory comparison of soil spectral measurements as part of the SoilSpec4GG project.

This repository is used for exploring the instruments variability with visual inspection, PCA projection, correlation spectra, correlation matrices, and dissimilarity analysis.

The datasets were prepared to a target format in soilspectroscopy/ringtrial-prep.

The workspace development is defined by:

• GitHub repository: soilspectroscopy/ringtrial-eda.
• Google Cloud storage for efficient file storage and access: whrc.org/soilcarbon-soilspec/storage/sc-ringtrial.

Spectral visualization

All instruments were plotted and are available at outputs/check_spectra/plot_mir_instrument<number>_<preprocessing>.png. A grid with all spectral variations is displayed below for instrument 8 (Woodwell Climate vertex) as an illustration example.

Instances check

All separate plots are available at outputs/instance_spectra/plot_instance_comparison_<preprocessing>_<type>.png with type being either for all instruments or 3 selected organizations. A grid with all plot variations is displayed below including a dedicated plot for evaluating the SST alignment.

Principal component analysis

All separate plots are available at outputs/pca_projection/plot_pca_scores_projection_<preprocessing>_all.png. A grid with all plot variations is displayed below including a dedicated plot for evaluating the SST alignment.

Correlation spectra

All separate plots are available at outputs/correlation_spectra/plot_correlation_spectra_<preprocessing>_all.png. A grid with all plot variations is displayed below including a dedicated plot for evaluating the SST alignment.

Correlation matrix

All separate plots are available at outputs/correlation_matrix/plot_correlation_matrix_<preprocessing>_all.png. A grid with all plot variations is displayed below including a dedicated plot for evaluating the SST alignment.

Dissimilarity analysis

All separate plots are available at outputs/similarity/plot_dissimilarity_<preprocessing>.png. A grid with all plot variations is displayed below including a dedicated plot for evaluating the SST alignment.