@MastersThesis{Sano:1987:CoPrMi,
author = "Sano, Edson Eyji",
title = "Contribui{\c{c}}{\~a}o {\`a} prospec{\c{c}}{\~a}o mineral
regional de dep{\'o}sitos de ferro e {\`a}
discrimina{\c{c}}{\~a}o litol{\'o}gica da por{\c{c}}{\~a}o
norte do estado da Bahia atrav{\'e}s das t{\'e}cnicas de
processamento digital de imagens do TM-Landsat 5",
school = "Instituto Nacional de Pesquisas Espaciais (INPE)",
year = "1987",
address = "S{\~a}o Jos{\'e} dos Campos",
month = "1987-12-18",
keywords = "observa{\c{c}}{\~a}o da terra, min{\'e}rio, ferro, mining,
iron.",
abstract = "Na primeira parte da pesquisa, os dados {{}} digitais do
TM-LANDSAT 5 e a t{\'e}cnica de classifica{\c{c}}{\~a}o
tem{\'a}tica de imagens denominada SINGLE-CELL foram utilizados
com o prop{\'o}sito de desenvolver trabalhos de
prospec{\c{c}}{\~a}o {{}} mineral regional dos dep{\'o}sitos de
ferro, numa escala de 1:50.000. A {\'a}rea de estudo selecionada,
de caracter{\'{\i}}stica semi-{\'a}rida, situa-se na
por{\c{c}}{\~a}o norte do Estado da Bahia, e apresenta uma
extens{\~a}o em torno de 14.200 Km2. Basicamente, a
classifica{\c{c}}{\~a}o de imagens consistiu em extrapolar para
toda a {\'a}rea-teste, os padr{\~o}es espectrais referentes aos
minerais de ferro, extra{\'{\i}}dos dos dep{\'o}sitos de
ferro-tit{\^a}nio-van{\'a}dio de Campo Alegre de Lourdes (BA). A
sele{\c{c}}{\~a}o inicial de 30 alvos, onde os trabalhos de
campo se concentraram, e uma posterior minimiza{\c{c}}{\~a}o da
influencia de sombreamento de relevo, mostraram que a
classifica{\c{c}}{\~a}o tem{\'a}tica pode dar grande
contribui{\c{c}}{\~a}o {\~a} campanha de prospec{\c{c}}{\~a}o
mineral, principalmente nas suas etapas iniciais. Na segunda parte
desta pesquisa, os dados digitais do TM e as principais
t{\'e}cnicas de realce de {{}} imagens foram utilizados na
discrimina{\c{c}}{\~a}o de unidades {{}} litol{\'o}gicas da
por{\c{c}}{\~a}o SW da serra dos Colomis (BA),
munic{\'{\i}}pio de Nova Remanso (BA), numa superf{\'{\i}}cie
de aproximadamente 7,5 x 7,5 Km. A escala de trabalho foi de
1:25.000. Foram interpretadas visualmente, as seguintes
composi{\c{c}}{\~o}es coloridas: a) RGB, precedida de
amplia{\c{c}}{\~a}o linear de contraste, {\'e}pocas seca e
{{chuvosa;}} b) IHS, {\'e}poca {{chuvosa;}} c) imagens
componentes, precedidas por amplia{\c{c}}{\~a}o linear de
contraste, {\'e}poca chuvosa. As imagens real{\c{c}}adas por
divis{\~a}o de bandas n{\~a}o apresentaram
informa{\c{c}}{\~o}es espectrais significativas, enquanto que os
melhores resultados foram obtidos com a composi{\c{c}}{\~a}o
IHS, bandas TM3, TM4 e TM5. A alta correla{\c{c}}{\~a}o obtida
entre as classes espectrais delimitadas nas imagens e as unidades
1ito1{\'o}gicas mapeadas previamente e verificadas no campo,
demonstrou o grande potencial dos dados digitais do TM,
processados pelas t{\'e}cnicas acima mencionadas, nos trabalhos
de cartografia geol{\'o}gica. ABSTRACT: In the first part of the
research, TM-LANDSAT 5 digital data and thematic classification
technique known as SINGLE-CELL were used with the purpose of
developing regional iron prospection research, in a 1:50,000
scale. The Selected study area, with semi-arid characteristics, is
located in the northern region of the State of Bahia and presents
an enlargement of about 14,200 Km2. Basically, the image
classification consisted in the extension, for the whole test
area, of the spectral patterns related to the iron minerals and
extracted from the Campo Alegre de Lourdes iron-titanium-vanadium
deposits. The thirty targets that were initially selected for
field work and a posterior minimization of relief influence
indicated that the thematic classification can give a large
contribution to the mineral search campaign, mainly at its initial
phase. In the second part of this research, the TM digital data
and image enhancement techniques were utilized in lithologic units
discrimination in the SW of Serra dos Colomis, Nova Remanso County
(BA), in an area of 7.5 x 7.5 km. The work was realized at the
1:25,000 scale. The following color image compositions were
interpreted: a) RGB, pre-processed by contrast linear enlargement
of the images extrated in dry and rainy {{seasons;}} b) IHS, in
rainy {{season;}} and c) principal component images, pre-processed
by contrast linear enlargement of the images in rainy season.
Images enhanced by band ratio did not present expressive spectral
informations and better results were obtained by utilizing the IHS
composition of TM3, TM4 The high correlation obtained between the
delimited spectral classes in the images and the previously mapped
lithologic units and with field checking, demonstrated the TM
digital data potencial for geologic mapping, processed by the
above techniques.",
committee = "Vitorello, {\'{\I}}caro (presidente) and Paradella, Waldir
Renato (orientador) and Amaral, Gilberto and Meneses, Paulo
Roberto",
englishtitle = "Contribution to the regional mineral prospecting of iron deposits
and to the lithographic discrimination of the northern portion of
the state of Bahia through the TM-Landsat digital image processing
techniques 5.",
language = "pt",
pages = "192",
ibi = "8JMKD3MGP7W/37H26AB",
url = "http://urlib.net/ibi/8JMKD3MGP7W/37H26AB",
targetfile = "publicacao.pdf",
urlaccessdate = "03 maio 2024"
}