Data/hora: 17/06/2024 04:00:21

Biblioteca(s): | Embrapa Unidades Centrais.
Data corrente: | 17/01/2003
Data da última atualização: | 14/11/2018
Autoria: | DEMATTÊ, J. A. M.
Afiliação: | José Alexandre M. Demattê, Escola Superior de Agricultura Luiz de Queiroz - Esalq/Departamento de Solos e Nutrição de Plantas.
Título: | Characterization and discrimination of soils by their reflected electromagnetic energy.
Ano de publicação: | 2002
Fonte/Imprenta: | Pesquisa Agropecuária Brasileira, Brasília, DF, v. 37, n. 10, p. 1445-1458, out. 2002
Idioma: | Inglês
Notas: | Título em português: Caracterização e discriminação de solos pela sua energia eletromagnética refletida.
Conteúdo: | The objective of this work was to verify if reflected energy of soils can characterize and discriminate them. A spectroradiometer (Spectral reflectance between: 400-2,500 nm) was utilized in laboratory. The soils evaluated are located in Bauru region, SP, Brazil, and are classified as Typic Argiudoll (TR), Typic Eutrorthox (LR), Typic Argiudoll (PE), Typic Haplortox (LE), Typic Paleudalf (PV) and Typic Quartzipsamment (AQ). They were characterized by their spectral reflectance as for descriptive conventional methods (Brazilian and International) according to the types of spectral curves. A method for the spectral descriptive evaluation of soils was established. It was possible to characterize and discriminate the soils by their spectral reflectance, with exception for LR and TR. The spectral differences were better identified by the general shape of spectral curves, by the intensity of band absorption and angle tendencies. These characteristics were mainly influenced by organic matter, iron, granulometry and mineralogy constituents. A reduction of iron and clay contents, which influenced higher reflectance intensity and shape variations, occurred on the soils LR/TR, PE, LE, PV and AQ, on that sequence. Soils of the same group with different clay textures could be discriminated. The conventional descriptive evaluation of spectral curves was less efficient on discriminating soils. Simulated orbital data discriminated soils mainly by bands 5 and 7.
Palavras-Chave: | absortividade; espectrofotometria de infravermelho; infrared spectrophotometry; refletância.
Thesagro: | Sensoriamento Remoto.
Thesaurus Nal: | absorbance; reflectance; remote sensing.
Categoria do assunto: | --
URL: | http://ainfo.cnptia.embrapa.br/digital/bitstream/AI-SEDE/24065/1/1445.pdf
Registro original: | Embrapa Unidades Centrais (AI-SEDE)
Exemplares: | AI-SEDE - (24065-1) - UPE - AP - PP - 630.72081 - P474 -  - DIS