Data/hora: 20/05/2024 05:34:29

Provedor de dados: 	90	
País: 	Brazil	
Título: 	An appropriate data set size for digital soil mapping in Erechim, Rio Grande do Sul, Brazil	
Autores: 	Caten,Alexandre ten; Dalmolin,Ricardo Simão Diniz; Pedron,Fabrício de Araújo; Ruiz,Luis Fernando Chimelo; Silva,Carlos Antônio da.	
Data: 	2013-04-01	
Ano: 	2013	
Palavras-chave: 	Decision tree; Pedometry; Soil survey; Mapping unit.	
Resumo: 	Digital information generates the possibility of a high degree of redundancy in the data available for fitting predictive models used for Digital Soil Mapping (DSM). Among these models, the Decision Tree (DT) technique has been increasingly applied due to its capacity of dealing with large datasets. The purpose of this study was to evaluate the impact of the data volume used to generate the DT models on the quality of soil maps. An area of 889.33 km² was chosen in the Northern region of the State of Rio Grande do Sul. The soil-landscape relationship was obtained from reambulation of the studied area and the alignment of the units in the 1:50,000 scale topographic mapping. Six predictive covariates linked to the factors soil formation, relief and organisms, together with data sets of 1, 3, 5, 10, 15, 20 and 25 % of the total data volume, were used to generate the predictive DT models in the data mining program Waikato Environment for Knowledge Analysis (WEKA). In this study, sample densities below 5 % resulted in models with lower power of capturing the complexity of the spatial distribution of the soil in the study area. The relation between the data volume to be handled and the predictive capacity of the models was best for samples between 5 and 15 %. For the models based on these sample densities, the collected field data indicated an accuracy of predictive mapping close to 70 %.	
Tipo: 	Info:eu-repo/semantics/article	
Idioma: 	Inglês	
Identificador: 	http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832013000200007	
Editor: 	Sociedade Brasileira de Ciência do Solo	
Relação: 	10.1590/S0100-06832013000200007	
Formato: 	text/html	
Fonte: 	Revista Brasileira de Ciência do Solo  v.37 n.2 2013	
Fonte: 	info:eu-repo/semantics/openAccess