%0 Journal Article
%4 sid.inpe.br/iris@1912/2005/07.19.02.48.54
%2 sid.inpe.br/iris@1912/2005/07.19.02.49
%@issn 0101-9082
%F 834
%T O significado litologico da informacao espectral e temporal (sazonal)de dados digitais MSS do satelite Landsat-3 para baixo do vale do Rio Curaca, Bahia
%D 1986
%8 jun.
%A Paradella, Waldir Renato,
%B Geociências
%V 16
%N 2
%P 135-148
%K GEOLOGIA, RIO CURACA (BA), MSS LANDSAT, LANDSAT-3, LITOLOGIA, LITHOLOGY.
%X Spectral and seasonal information from computer enhanced MSS Landsat 3 data were evaluation within the context of lithological discrimination in the lower valley of Curaca River, State of Bahia, Northeast of Brazil. The chosen area im made up of low to high Archean-Proterozoic metamporphic rockes and constitutes part of the important copper province of the Curaca Valley, 100 km north of the Caraiba Copper Mune. The vegetation is represented by the caatinga, typicalof the Brazilian semi-arid environment with variable cover density and marked seasonality. The occurrence of rock outcrops is not high. Several digital enhacement techniques were applied including: 1)Linear Contrast Stretch: 2)Stretched Band Ratio and 3)Principal Component Transformation. These techniques allowed to emphasize subtle difference in the spectral reflectance of the surface which were good indicatos of the changes in the residual soil composition and geobotanical controls given by variations in the vegetation cover well-correlated with the lithological variations of the lithological units mapped by conventional methods in the 1:50,000 scale and provided additionally new contributions to the geological knowledge of the area. The spectral measurements collected in situ for with the data registered ny the Landsat MSS CCT's and provided additional information to the understanding of the causes of the variations in the registered spectral data. The analysis of the orbital data from the dry season was not sufficient to express the lithological differences, but the multiseasonal approach was of great value.
%3 paradella_significado.pdf