Let me please know, Is a free access to the database of SOIL SPECTRAL LIBRARY ? And which methods are better for correlation between parameters of soils from spectral library and soils that are't included to the specified library ?
So far as I know these spectra are usually not collected under standard conditions, indeed the best conditions are the subject of controversy. Consequently the data are operationally defined. If somebody knows better I'd like to learn from them
I would also recommend to use the ASTER Spectral Library. From my own experience the spectra you can find in the mentioned library are in very good correlation to spectra of the same soils measured by Diffuse Reflectance Infrared Fourier Transform Spectroscopy. Therefore we used a Praying Mantis™ from Harrick in the MIR spectral region.