Provenance, Authenticity & Ensemble Analysis

Step 6.2 — PCA / Mahalanobis anomaly detection, multi-metric spectral comparison (cosine, Pearson, χ², SAM), and Pb-isotope bivariate provenance field mapping.

Upload Spectrum / Image

Load CSV (λ, flux)

λ start (nm)

λ end (nm)

Analysis Mode

Projects the spectrum onto two principal components derived from the library and flags anomalous features via Mahalanobis distance.

Upload a reference spectrum CSV and compute cosine similarity, Pearson correlation, χ², and SAM angle.

Enter measured Pb-isotope ratios to assign provenance region.

²⁰⁶Pb/²⁰⁴Pb ²⁰⁷Pb/²⁰⁴Pb ²⁰⁸Pb/²⁰⁴Pb