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Título: | Mapping soils in two watersheds using legacy data and extrapolation for similar surrounding areas |
Título(s) alternativo(s): | Mapeamento de solos em duas sub-bacias hidrográficas usando dados legados e sua extrapolação para áreas similares do entorno |
Palavras-chave: | Decision trees Soil science Tropical soils Árvores de decisão Pedologia (Ciência do solo) Solos tropicais |
Data do documento: | 2016 |
Editor: | Universidade Federal de Lavras |
Citação: | PELEGRINO, M. H. P. et al. Mapping soils in two watersheds using legacy data and extrapolation for similar surrounding areas. Ciência e Agrotecnologia, Lavras, v. 40, n. 5, Sept./Oct. 2016. |
Resumo: | Existing soil maps (legacy data) associated with digital mapping techniques are alternatives to obtain information at lower costs, however, tests are required to do it more efficiently. This study had as objectives to compare different methods to extract information from detailed scale soil maps using decision trees for mapping soil classes at two watersheds in Minas Gerais, validate these maps in the field and use the best method to extrapolate information to larger areas, also validating these maps of larger areas. Detailed soil maps of Vista Bela creek (VBW) and Marcela creek (MCW) watersheds were used as source of information. Seven methods to extract information from maps were compared: the whole polygon, eliminating 20 and 40 m from the polygon boundaries, and with buffers around the sampled points with radii of 25 m, 50 m, 75 m, and 100 m. The Classification and Regression Trees (CART) algorithm was employed to create decision trees and enable creation of soil maps. Accuracy was assessed through overall accuracy and kappa index. The best method was used to extrapolate information to larger areas and maps were validated. The best methods for VCW and MCW were, respectively, eliminating 20 m from polygon edges and buffer of 25 m of radii from points. Maps for larger areas were obtained using these methods. Removing uncertainty areas from legacy soil maps contribute to better modeling and prediction of soil classes. Information generated in this work allowed for validated extrapolation of soil maps for regions surrounding the watersheds. |
URI: | http://repositorio.ufla.br/jspui/handle/1/36167 |
Aparece nas coleções: | DCS - Artigos publicados em periódicos |
Arquivos associados a este item:
Arquivo | Descrição | Tamanho | Formato | |
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ARTIGO_Mapping soils in two watersheds using legacy data and extrapolation for similar surrounding areas.pdf | 4,36 MB | Adobe PDF | Visualizar/Abrir |
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