@PhDThesis{Paradella:1990:DiUnLi,
               author = "Paradella, Waldir Renato",
                title = "Discrimina{\c{c}}{\~a}o de uma unidades litol{\'o}gicas no 
                         Baixo Vale do Rio Cura{\c{c}}{\'a} (Bahia), atrav{\'e}s de 
                         realces por processamento digital de dados MSS-LANDSAT 3",
               school = "Universidade de S{\~a}o Paulo (USP)",
                 year = "1990",
              address = "S{\~a}o Paulo",
                month = "1983-12-07",
             keywords = "Rio Cura{\c{c}}{\'a} (BA), litologia, processamento digital, 
                         LANDSAT-3.",
             abstract = "Informa{\c{c}}{\~o}es espectrais e multisazonais detectadas pelo 
                         MSS-Landsat-3 real{\c{c}}adas por diferentes t{\'e}cnicas de 
                         realce (amplia{\c{c}}{\~a}o Linear de Contraste, 
                         Composi{\c{c}}{\~o}es Coloridas Contrastadas, Divis{\~o}es de 
                         Bandas e Componentes Principais), foram avaliadas no contexto de 
                         discriminar unidades litol{\'o}gicas do Baixo Vale do Rio 
                         Cura{\c{c}}{\'a}, Estado da Bahia. As diferentes t{\'e}cnicas 
                         possibilitaram enfatizar diferen{\c{c}}as sutis de 
                         reflect{\^a}ncia espectral da superf{\'{\i}}cie, indicativas de 
                         um controle geobot{\^a}nico dado por varia{\c{c}}{\~o}es na 
                         densidade de cobertura vegetal de caatinga e de mudan{\c{c}}as 
                         composicionais nos solos residuais, bem correlacionadas com as 
                         varia{\c{c}}{\~o}es litol{\'o}gicas do substrato. Os 
                         padr{\~o}es tonais extra{\'{\i}}dos, corresponderam 
                         excepcionalmente bem com as unidades litol{\'o}gicas, 
                         cartografadas previamente na escala 1:50.000. Medidas espectrais 
                         {"}in situ{"} das condi{\c{c}}{\~o}es superficiais das unidades 
                         litol{\'o}gicas e em laborat{\'o}rio, de amostras de solos, 
                         mostram-se compat{\'{\i}}veis com os dados registrados a 
                         n{\'{\i}}vel orbital. Uma an{\'a}lise do desempenho visual dos 
                         v{\'a}rios produtos LANDSAT real{\c{c}}ados digitalmente, foi 
                         tamb{\'e}m conduzida via crit{\'e}rios de sele{\c{c}}{\~a}o de 
                         atributos espectrais. ABSTRACT: Spectral and multitemporal 
                         informations detected by computer enhanced Landsat - MSS 3, were 
                         evaluated within the context of lithological discrimination in a 
                         semi-arid tropical region of the northeast of Brazil. The chosen 
                         area (lower Valley of Cura{\c{c}}{\'a} River, State of Bahia), 
                         is made up of low to high grade Archean/Proterozoic metamorphic 
                         rocks, and constitutes part of the important copper province of 
                         the Cura{\c{c}}{\'a} Valley, located 100 km north of the 
                         Cara{\'{\i}}ba Copper Mine. The vegetation is represented by the 
                         {"}caatinga{"}, typical of the brazilian semi-arid region and 
                         which have varying cover density and marked seasonality. The 
                         occurence of outcrops or exposed rocks is small. The techniques 
                         used, including (1) linear contrast stretch, (2) contrast 
                         stretched color composites, (3) band-ratioing and (4) Principal 
                         Components, make it possible to emphasize subtle differences in 
                         the spectral reflectance of the surface, good indicators of 
                         geobotanical controls given by variations in the vegetation cover 
                         and the changes in the residual soil compositions well correlated 
                         to the lithological variations of the substratum. The observed 
                         brightness and tonal patterns correspond exceptionally well to the 
                         lithological units mapped by conventional geological methods in 
                         the 1:50.000 scale and provided, additionally, new contributions 
                         to the geological understanding of the area. The spectral 
                         measurements, collected in situ for the surface conditions of the 
                         units and in the laboratory for the soil samples, showed to be 
                         compatible to the data registered by the Landsat - MSS CCTs and 
                         provided subsidies to the understanding of the causes of the 
                         variations in the registered spectral data. An analysis of the 
                         visual performance of the enhanced products for lithological 
                         discrimination was performed utilizing criterion of spectral 
                         atributes selection (JM distance).",
          affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)}",
           copyholder = "SID/SCD",
         englishtitle = "Discrimination of lithological units in the lower Valley of 
                         Cura{\c{c}}{\'a} River (Bahia), through enhancements for data 
                         processing digital Landsat MSS-3",
                label = "814",
             language = "pt",
                pages = "233",
           targetfile = "publicacao.pdf",
        urlaccessdate = "27 jun. 2024"
}