A New Spectral Unmixing Method Based on Derivative of Ratio Spectroscopy
نویسندگان
چکیده
The precise analysis of mineral abundance is a key content of hyperspectral technology research. In the present paper, a new spectral unmixing method based on derivative of ratio spectroscopy (DRS) was employed for visible to short-wave infrared (VIS–SWIR; 0.4–2.5 μm) reflectance data. The mixtures of plaster and allochite with different proportions were analyzed by DRS, Fully Constrained Least Squares (FCLS) and Non-Negative Least Squares (NNLS). A high precision was observed for DRS: for plaster, RMSE at the four bands are all less than 1.5%, and PCC are all higher than 0.999; for allochite, the precision is a bit lower, but the highest RMSE is still no more than 4.5%. Comparatively, the results for NNLS and FCLS are much worse than DRS. The result shows that this new spectral unmixing method is simple, of rigorous mathematical proof, and highly precise. It has a great potential in high-precision quantitative analysis of spectral mixture with fixed endmembers.
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