Journal of Agronomy1812-53791812-5417Asian Network for Scientific Information10.3923/ja.2014.100.109NanniMarcos Rafael DematteJose Alexandre Melo JuniorCarlos Antonio da Silva RomagnoliFranciele SilvaAnderson Antonio da CezarEverson GasparottoAline de Carvalho 32014133The objective of this study was to evaluate the use of a laboratory
and an orbital sensor on the classification of soils in a complete 180 ha bare
soil area located in Brazil. The 180 points were located as a regular grid of
100x100 m (one point per ha). In each point, soil samples were georreferenced
(GPS) and collected (0-20 and 80-100 cm depths). Based on the traditional soil
analysis and field work (with 18 profile evaluation), a detailed soil map was
developed as to be our real
pattern. This soil map determined
18 soil classes and 53 polygons. Other soil maps were developed based on the
following described methods. The first method was based on the orbital image
(landsat) interpretation. It was used a color composition 5R, 4G, 3B. Based
on the visual interpretation it was determined 16 classes of soils and 35 polygons.
A statistical method was used to compare the traditional soil map with the color
composition soil map. The traditional soil map was more accurate although the
color composition had several. The second method was performed with laboratory
sensor information. Spectral data (400-2500 nm) was acquired from soil samples
(both depths of each point). Data was modelized and cluster analysis grouped
the spectral curves. The third method consisted on the evaluation of the surface
soil information (obtained in laboratory but convoluted for the landsat spectral
bands). With this method 9 groups were discriminated. The fourth method was
determined by quantitative analyses of each pixel information extracted from
a processed and reflectance transformed landsat image. The number of groups
determined were nine. The main conclusion was: Any sensor method reached the
detailed soil map information.]]>Agbu, P.A., D. Fehrenbacher and I.J. Jansen,199054807812Curi, P.R.,19833516781685Dematte, J.A.M., J.L.I. Dematte, W.P. Camargo, P.R. Fiorio and M.R. Nanni,20013879102Dematte, J.A.M., R.C. Campos, M.C. Alves, P.R. Fiorio and M.R. Nanni,200412195112Dematte, J.A.M. and M.R. Nanni,20032447154738INPE,19991999Nanni, M.R. and J.A.M. Dematte,200670393407Thome, K.B., B.L. Markham, J.L. Barker, P. Slater and S. Biggar,199763853858Camargo, O.A., A.C. Moniz, J.A. Jorge and J.M. Valadares,19861986Dematte, J.A.M.,19951995Dematte, J.A.M.,19991999EMBRAPA-Empresa Brasileira de Pesquisa Agropecuaria,19991999Goosen, D.,19681968IPT,19811981Van Raij, B. and J.A. Quaggio,19831983SAS,19921992Soil Survey Staff,19988th Edn.,