PROGRAMMING THE CALCULATION OF SLOPE IN SIG BY THE ORTHOGONAL VECTOR METHOD
DOI:
https://doi.org/10.26512/2236-56562002e39681Keywords:
geoprocessing, algorithm, slope angleAbstract
This research shows an evaluation of the vector calculation applied to the development of a slope angle mapping program. This method is based on the vector sum of slope orthogonal components, quantified through moving windows. The orientations of the retangular axes systems and the estimate methods of the slope components were evaluated in relation to manual measurements. The best correlation was found when choosing the maximum results between the orientations and the maximum height in each windowed direction. All modes of the vector approach worked better than the calculation available in the geographical information system. High slopes were poorly estimated by all methods.
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Almeida, F. F. M. (1964). Fundamentos geológicos do relevo paulista. Boletim. Instituto Geográfico e Geológico. n.41, p.167-262.
Bertoni, J. & Lombardi Neto, F. (1992). Conservação do Solo. 3.ª ed., Editora Ícone, São Paulo. 395p.
De Biasi, M. (1970). Cartas de Declividade: confecção e utilização. Geomorfologia . n.21, p. 8-13.
Eastman, J. R. (1995). Idrisi for Windows : user’s guide. Worcester: Clark University.
Golden Software. (1995). Surfer Version 6.01- Surface Mapping System. Golden: Golden Software, Inc.
Koffler, N. F. (1994). Carta de declividade da bacia do rio Corumbataí para análise digital (SIG). Geografia, v.19, n.2, p.167-82.
Minitab Inc. Meet MINITAB. (2000). Release 13 for Windows. State College, Pennsylvania. Não paginado.
Moretti, E., Koffler, N. F., Teixeira, A. L. A. (1989). Técnicas digitais para mapeamento de declividade e orientação de vertentes baseadas no uso de sistemas de informação geográfica. Boletim de Geografia Teorética, v.19, n.37/38, p. 29-52.
Valenzuela, C. R. (1991). Data analysis and models In: Belward, A. S,; Valenzuela, C. R. Remote Sensing and Geographical Information Systems for Resource Management in Developing Countries. Euro Courses: Remote Sensing, Netherlands: Kluwer, v.1, cap.18, p.335-48.
Valeriano, M. M. (1999). Estimativa de variáveis topográficas por geoprocessamento para modelagem da perda de solos. Tese de doutorado em Geociências, Instituto de Geociências e Ciências Exatas, UNESP/Rio Claro, 172p.
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