Tipos de solos

artigo anterior

934
Anais XIII Simpósio Brasileiro de Sensoriamento Remoto, Florianópolis, Brasil, 21-26 abril 2007, INPE, p. 6453-6460.

Estudo das relações entre tipos de solos, alteração, mineralogia e topografia por sensoriamento remoto hiperespectral Lênio Soares Galvão 1 Antônio Roberto Formaggio 1 Eduardo Guimarães Couto 2 Dar A. Roberts 3 Instituto Nacional de Pesquisas Espaciais - INPE Divisão de Sensoriamento Remoto, Caixa Postal 515, 12245-970 - São José dos Campos (SP). {lenio, formag}@dsr.inpe.br
2 1

Universidade Federal de Mato Grosso (UFMT), Faculdade de Agronomia e Medicina Veterinária, Av. Fernando Correa, s/n, Boa Esperança, 78060-900, Cuiabá (MT). [e-mail]

3

University of California, Geography Department, Santa Barbara, CA, 93106-4060, USA. [e-mail]

Abstract. Principal components, band depth analysis and the Spectral Feature Fitting (SFF) technique were applied over hyperspectral data collected by the Airborne Visible/InfraRed Imaging Spectrometer (AVIRIS) in the vicinity of Campo Verde (MT) to characterize major variations in reflectance of different soil types; changes in the depth of major absorption bands due to kaolinite (2210 nm) and gibbsite (2260 nm); and the occurrence of these minerals in the scene, respectively. Laboratory-derived regression relationships between the silica/aluminum ratio and the absorption band depth values at 2210 nm (kaolinite) and 2260 nm (gibbsite) were used to estimate the Ki index (1.7SiO2/Al2O3) in AVIRIS spectra as an indicator of the degree of soil weathering. Results were analyzed as a function of the topography obtained from an Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER)-derived digital elevation model. Results showed that low reflectance soils predominated at higher elevations and high reflectance soils at lower elevations. The Ki results calculated on a per-pixel basis showed good correspondence with SFF mineral identification of kaolinite and