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| Berg,M. van Den; Oliveira,J. B.. |
| The quality of semi-detailed (scale 1:100.000) soil maps and the utility of a taxonomically based legend were assessed by studying 33 apparently homogeneous fields with strongly weathered soils in two regions in São Paulo State: Araras and Assis. An independent data set of 395 auger sites was used to determine purity of soil mapping units and analysis of variance within and between mapping units and soil classification units. Twenty three soil profiles were studied in detail. The studied soil maps have a high purity for some legend criteria, such as B horizon type (> 90%) and soil texture class (> 80%). The purity for the "trophic character" (eutrophic, dystrophic, allic) was only 55% in Assis. It was 88% in Araras, where many soil units had... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Soil variability; Map quality; Sampling; Latosols. |
| Ano: 2000 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832000000200016 |
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| Cruz-Cárdenas,Gustavo; Ortiz-Solorio,Carlos Alberto; Ojeda-Trejo,Enrique; Martínez-Montoya,Juan Felipe; Sotelo-Ruiz,Erasto Domingo; Licona-Vargas,Atenogenes Leobardo. |
| Map units directly related to properties of soil-landscape are generated by local soil classes. Therefore to take into consideration the knowledge of farmers is essential to automate the procedure. The aim of this study was to map local soil classes by computer-assisted cartography (CAC), using several combinations of topographic properties produced by GIS (digital elevation model, aspect, slope, and profile curvature). A decision tree was used to find the number of topographic properties required for digital cartography of the local soil classes. The maps produced were evaluated based on the attributes of map quality defined as precision and accuracy of the CAC-based maps. The evaluation was carried out in Central Mexico using three maps of local soil... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Decision tree; Digital elevation model; Map quality. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832011000300003 |
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