Marco Crotti, ILARIA LONGHI, SANDRO MELI, MARIA SGAVETTI
ABSTRACT
Mineralogical and short wave infrared (SWIR) spectral characters of
North-East Italian beach sands have been investigated in order to define
interpretation rules for high spatial and spectral resolution remote sensed
data. Beach sands are complex mineralogical mixtures, yielding spectral curves
which are the result of non-linear interactions of the components. Analysis of
spectroscopic laboratory data allowed us to identify spectral typologies and spectrofacies (recurrent association
of typologies). Petrographic analysis of sands allowed us to constrain the
interpretation of the spectrofacies, linking each spectral effect to its proper
mineral phase and chemical bond. Moreover, we defined relationships between
absorption structures (depth, shape and asymmetry of absorption bands) and
mineral abundances. Remote sensing data analysis was focused on the study of
spectral differences between laboratory spectra and remote hyperspectral data
induced by the different acquiring scale.