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Remote Sens. 2015, 7(9), 12160-12191; doi:10.3390/rs70912160

Comparative Analysis of MODIS Time-Series Classification Using Support Vector Machines and Methods Based upon Distance and Similarity Measures in the Brazilian Cerrado-Caatinga Boundary

1
Instituto do Meio Ambiente e dos Recursos Hídricos do Distrito Federal, Gerência de Reserva Legal, SEPN 511, Bloco C, Edifício Bittar, Brasília 70750-543, Brazil
2
Departamento de Geografia, Campus Universitário Darcy Ribeiro, Universidade de Brasília (UnB), Asa Norte, Brasília 70910-900, Brazil
3
Instituto Federal de Brasília (IFB), Campus Gama, DF 480, Setor de Múltiplas Atividades, Lote 01, Gama 72429-005, Brazil
*
Author to whom correspondence should be addressed.
Academic Editors: Clement Atzberger and Prasad S. Thenkabail
Received: 13 March 2015 / Revised: 21 August 2015 / Accepted: 25 August 2015 / Published: 18 September 2015
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Abstract

We have mapped the primary native and exotic vegetation that occurs in the Cerrado-Caatinga transition zone in Central Brazil using MODIS-NDVI time series (product MOD09Q1) data over a two-year period (2011–2013). Our methodology consists of the following steps: (a) the development of a three-dimensional cube composed of the NDVI-MODIS time series; (b) the removal of noise; (c) the selection of reference temporal curves and classification using similarity and distance measures; and (d) classification using support vector machines (SVMs). We evaluated different temporal classifications using similarity and distance measures of land use and land cover considering several combinations of attributes. Among the classification using distance and similarity measures, the best result employed the Euclidean distance with the NDVI-MODIS data by considering more than one reference temporal curve per class and adopting six mapping classes. In the majority of tests, the SVM classifications yielded better results than other methods. The best result among all the tested methods was obtained using the SVM classifier with a fourth-degree polynomial kernel; an overall accuracy of 80.75% and a Kappa coefficient of 0.76 were obtained. Our results demonstrate the potential of vegetation studies in semiarid ecosystems using time-series data. View Full-Text
Keywords: Caatinga; Cerrado; spectral angle mapper; spectral correlation mapper; euclidian distance measure; MODIS Caatinga; Cerrado; spectral angle mapper; spectral correlation mapper; euclidian distance measure; MODIS
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Abade, N.A.; Júnior, O.A.C.; Guimarães, R.F.; de Oliveira, S.N. Comparative Analysis of MODIS Time-Series Classification Using Support Vector Machines and Methods Based upon Distance and Similarity Measures in the Brazilian Cerrado-Caatinga Boundary. Remote Sens. 2015, 7, 12160-12191.

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