Caracterização fisica de ambientes carsticos atraves de sensoriamento remoto e SIG : o caso do Parque Nacional Cavernas do Peruaçu - Januaria/ Itacarambi, MG / Characterization of karstic environments by means of remote sensing and GIS : the case of Cavernas do Peruaçu National Park, Januaria/ Itacarambi, Minas Gerais State, Brazil

AUTOR(ES)
DATA DE PUBLICAÇÃO

2007

RESUMO

This dissertation deals with the characterization of karstic environments through the use of remote sensing and GIS techniques, using as a case study the Cavernas do Peruaçu National Park, located in Januária and Itacarambi counties, Minas Gerais State, Brazil. The selection of this area was due to its relevance in terms of the speleological, archeological, geomorphological and biotic contents, representing one of the most important karstic areas in Brazil. Aspects such as geology, geomorphology, hydrography and speleology were considered in the analysis of the physical environment of the study area. Remote sensing techniques comprised reflectance spectroscopy, used for the quantitative analysis of carbonate rocks, and digital image processing applied to imagery acquired by spaceborne sensors, including color composites, vegetation index, spectral enhancement and transforms and spectral classification of surface targets which resulted in lithologic, lithofaciologic and vegetation communities discrimination. Spatial modeling of geographic attributes was carried out by means of GIS techniques aiming to analyze multi-source map and image data, to calculate morphometric parameters, to refine pre-existing map, to produce realistic tridimensional models, to perform spatial analysis and, finally, to generate a map of the speleological potential, this latter with the purpose to orientate future exploration surveys in the field. Results and constraints were analyzed and discussed with respect to the procedures employed and the characteristics of the data employed, such as remote sensing imagery. The joint use of geotechnologies met the proposed objectives, demonstrating how the use of these tools may contribute to diminish the subjectivity of the analysis, allowing quantitative descriptions of karstic environments, complementing existing qualitative studies

ASSUNTO(S)

sensoriamento remoto espeleologia carste sistemas de informação geografica

ACESSO AO ARTIGO

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