Artículos de revistas
Mapping Iron Oxides With Landsat-8/oli And Eo-1/hyperion Imagery From The Serra Norte Iron Deposits In The Carajas Mineral Province, Brazil
Mapeamento De óxidos De Ferro Usando Imagens Landsat-8/oli E Eo-1/hyperion Nos Depósitos FerrÃferos Da Serra Norte, ProvÃncia Mineral De Carajás, Brasil
Registro en:
Brazilian Journal Of Geology. Soc Brasileira Geologia, v. 46, p. 331 - 349, 2016.
2317-4889
2317-4692
WOS:000388333600002
10.1590/2317-4889201620160023
Autor
Ducart
Diego Fernando; Silva
Adalene Moreira; Bemfica Toledo
Catarina Laboure; de Assis
Luciano Mozer
Institución
Resumen
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) Mapping methods for iron oxides and clay minerals, using Landsat-8/Operational Land Imager (OLI) and Earth Observing 1 (EO-1)/Hyperion imagery integrated with airborne geophysical data, were applied in the N4, N5, and N4WS iron deposits, Serra Norte, Carajas, Brazil. Band ratios were achieved on Landsat-8/OLI imagery, allowing the recognition of the main minerals from iron deposits. The Landsat-8/OLI imagery showed a robust performance for iron oxide exploration, even in vegetated shrub areas. Feature extraction and Spectral Angle Mapper hyperspectral classification methods were carried out on EO-1/Hyperion imagery with good results for mapping high-grade iron ore, the hematite-goethite ratio, and clay minerals from regolith. The EO-1/Hyperion imagery proved an excellent tool for fast remote mineral mapping in open-pit areas, as well as mapping waste and tailing disposal facilities. An unsupervised classification was carried out on a data set consisting of EO-1/Hyperion visible near-infrared 74 bands, Landsat-8/OLI-derived Normalized Difference Vegetation Index, Laser Imaging Detection and Ranging-derived Digital Terrain Model, and high-resolution airborne geophysical data (gamma ray spectrometry, T-zz component of gradiometric gravimetry data). This multisource classification proved to be an adequate alternative for mapping iron oxides in vegetated shrub areas and to enhance the geology of the regolith and mineralized areas. 46 3 331 349 Vale Company Universidade de Brasilia Coordination for Improvement of Higher Education Personnel (Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior - CAPES) Brazilian National Counsel of Technological and Scientific Development (Conselho Nacional de Desenvolvimento Cientifico e Tecnologico - CNPq) [307177/2014-9] Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)