Resumo

BASTIDAS-OBANDO, Ernesto  e  CARBONELL, Javier A.. Soil spectral characterization and mineralogy of the Cauca River Valley by visible and infrared (400 - 2,500 nm) spectroscopy. Agron. colomb. [online]. 2010, vol.28, n.2, pp.291-301. ISSN 0120-9965.

Spectral libraries are used to identify different soil types based on spectral analyses which feature their mineralogical and chemical composition. On these grounds, the objective of the present work consisted in determining whether there are any differences in the spectral profile of the soils of the geographical Cauca Valley at the taxonomic subgroup level; and to assess their spectral profiles in terms of the abundance of clay minerals. By means of cluster analysis we selected the most homogeneous samples of each taxonomic sub group to elaborate its spectral profile. Clay mineral concentrations were determined by means of a linear spectral unmixing model. Differences among taxonomic subgroups were found in both the magnitude of the spectral profiles and their wavelengths (1.400, 1.900 and 2.200 nm). Based on soil spectral profiles, the applied model can be used to objectively characterize clay mineral concentrations.

Palavras-chave : linear spectral unmixing; spectral library; spectral profile; linear spectral unmixing; clay minerals.

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