Please use this identifier to cite or link to this item: http://repositorio.ufla.br/jspui/handle/1/30862
Title: Object-based change detection using semivariogram indices derived from NDVI images: The environmental disaster in Mariana, Brazil
Other Titles: Detecção de mudanças baseada em objetos utilizando indices do semivariograma derivados de imagens NDVI: O disastre ambiental em Mariana, Brasil
Keywords: Remote sensing
Geostatistics
Feature extraction
Sensoriamento remoto
Geostatistica
Issue Date: 2017
Publisher: Universidade Federal de Santa Maria
Citation: SILVEIRA, E. M. de O. et al. Object-based change detection using semivariogram indices derived from NDVI images: The environmental disaster in Mariana, Brazil. Ciência e Agrotecnologia, Lavras, v. 41, n. 5, p. 554-564, Sept./Oct. 2017.
Abstract: Object-based change detection is a powerful analysis tool for remote sensing data, but few studies consider the potential of temporal semivariogram indices for mapping land-cover changes using object-based approaches. In this study, we explored and evaluated the performance of semivariogram indices calculated from remote sensing imagery, using the Normalized Differential Vegetation Index (NDVI) to detect changes in spatial features related to land cover caused by a disastrous 2015 dam failure in Brazil’s Mariana district. We calculated the NDVI from Landsat 8 images acquired before and after the disaster, then created objects by multiresolution segmentation analysis based on post-disaster images. Experimental semivariograms were computed within the image objects and semivariogram indices were calculated and selected by principal component analysis. We used the selected indices as input data to a support vector machine algorithm for classifying change and no-change classes. The selected semivariogram indices showed their effectiveness as input data for object-based change detection analysis, producing highly accurate maps of areas affected by post-dam-failure flooding in the region. This approach can be used in many other contexts for rapid and accurate assessment of such land-cover changes.
URI: http://repositorio.ufla.br/jspui/handle/1/30862
Appears in Collections:DCF - Artigos publicados em periódicos

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