Gaffey collection (Adams' diffuse) (0.35-2.5 microns)
These spectra were acquired as directional hemispheric spectra using the Adams Beckman Dk-2A.
Directional hemisphere (diffuse) reflectance spectra with wavelength corrections based on interlaboratory comparisons for several samples. The function used was an inverse tangent relationship in energy space yielding a correction of between +10-15 nanometers in the .9 to 2.6 micron region. The error in the visible is negligible.