Reference Spectral Library

Browse reference spectra from the USGS Spectral Library Version 7 and other curated sources. Each spectrum includes interactive plots, metadata, and downloadable data.

Have an unknown spectrum? Match it against this entire library with HQI similarity scoring — no install, no data leaves your machine.

Identify My Sample
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Learn more about how spectral matching works, HQI scoring, and building a personal reference library on the Spectral Library Search page.