Caracterização radiométrica de seis solos na faixa-x de microondas, através de medições da permitividade complexa / Characterization of 6 soils in the X-band, through measurements of complex permittivity

AUTOR(ES)
DATA DE PUBLICAÇÃO

1986

RESUMO

Estimating and monitoring up-to-date soil moisture conditions over extensive areas through passive (or active) microwave remote sensing techniques requires the knowledge of the complex relative permitimitty (Er*) in function of soli moisture. X-Band measurements of Er* for different moisture conditions were made in laboratory for soil samples of six important Soils (PV2, LV3, LRd, LE1, SAP and Sc). Using a theoretical model and computational programmes developed, these measurements allowed estimates of the emissive characteristics of the soils that would be expected with the X-Band Microwave Radiometer build at INPE. The results, new, for soils from tropical regions, showed that only the physical characteristics and properties of the soils are not sufficient to explain the behaviour of Er* in function of soil moisture, indicating that the chemical and/or mineralogical properties of the soils do have an important contribution. The results also showed that Er* in function of soil moisture depends on soil class.

ASSUNTO(S)

microwave radiometers solos umidade do solo chemical composition radiometria soils radiometro de microondas microondas soil moisture permittivity superhigh frequences

ACESSO AO ARTIGO

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