Data/hora: 26/06/2024 15:44:42

Biblioteca(s): 	Epagri-Sede.	
Data corrente: 	16/01/2019	
Data da última atualização: 	16/01/2019	
Autoria: 	SILVA, E. B.; GIASSON, E.; CATEN, A. T.; DOTTO, A. C.; DEMATTÊ, J. A. M.; VEIGA, M.	
Título: 	Building a spectral library for estimating soil texture in the Santa Catarina State, Brazil.	
Ano de publicação: 	2018	
Fonte/Imprenta: 	In: WORLD CONGRESS OF SOIL SCIENCE, 21., 2018, Rio de Janeiro. Abstracts... Viçosa: Sociedade Brasileira de Ciência do Solo, 2018.	
Idioma: 	Inglês	
Conteúdo: 	Soil properties characterization is required to inform and lead decision-makers into action. To
achieve this goal, it is necessary to develop effective methods to soil measure and monitoring.
Several soil databases have been used to build large spectral library for improving and facilitating
the use of VIS-NIR-SWIR spectroscopy approach in a collaborative way. In this study, the
performance of four multivariate statistical techniques (e.g., Partial least-squares - PLS, Support
vector machine - SVM, Random forest - RF, Gaussian process regression - GPR) were compared to
evaluated their ability to predict sand, silt and clay content (%) using a regional soil spectral library.
A total of 1534 observations were collected throughout the State of Santa Catarina (SC). These
observations were used as dataset for the calibration (n = 1151) and validation (n = 383)
procedures. Soil spectra was obtained using the FieldSpec 3 (ASD) sensor in the VIS-NIR-SWIR
range. The spectra were subjected to seven preprocessing techniques including raw spectra (RAW),
first derivative (FD-SG), second derivative (SD-SG), continuum removed reflectance (CR),
detrending (DT), normalization by range (NBR) and multiplicative scatter correction (MSC). The
ranges of sand (1.0 to 99.0%), silt (0.0 to 83.0%) and clay (0.0 to 77.0 %) content are wide and
their coefficients of variation are large, indicating great variability of samples as a result of different
soil-forming factors.	
Palavras-Chave: 	chemometrics techniques; reflectance spectroscopy; Sand; silt and Clay content.	
Categoria do assunto: 	X Pesquisa, Tecnologia e Engenharia	
URL: 	http://intranetdoc.epagri.sc.gov.br/producao_tecnico_cientifica/DOC_41880.pdf	
Registro original: 	Epagri-Sede (Epagri-Sede)	
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