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Acta Scientiarum. Agronomy

On-line version ISSN 1807-8621


NANNI, Marcos Rafael et al. Landscape unit discrimination for pedological surveys by orbital spectral response. Acta Sci., Agron. (Online) [online]. 2010, vol.32, n.3, pp.555-561. ISSN 1807-8621.

The objective of this study was compare two soil survey methods. The first was performed by methods traditionally used to distinguish landscape units and soil class discrimination. The second was based on soil class distinction through orbital spectral response. In order to establish soil characteristics and their classification, soil samples were collected at two depths in a grid system, with a distance of 500 meters between points. With these samples, physical and chemical analyses were carried out. In the sampling points, the apparent reflectance of the soil, from the orbital image, was determined and, through cluster analysis landscape units were established. In order to evaluate the resemblance reliability between the landscape units established in each method, the Kappa index was used, the value set for the confusion matrix was 0.43, indicating high quality in the comparison, showing that the non-conventional method was as close as the one carried out by photointerpretation.

Keywords : soil survey; apparent reflectance; orbital image; soil classes; Kappa index.

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