Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/326591
Type: Artigo
Title: Representation Of Harmonic Cycles Of Modis Time Series For The Analysis Of Sugarcane Cultivation
Author: Goncalves Antunes
Joao Francisco; de Camargo Lamparelli
Rubens Augusto; Antunes Rodrigues
Luiz Henrique
Abstract: The objective of this work was to evaluate sugarcane cultivation, in a harmonic analysis applied to a time series of Modis vegetation indices, with the representation of harmonic terms. Daily rainfall data were obtained from Agritempo for the state of Sao Paulo, Brazil, and accumulated for a period of 16 days of Modis compositions, from the 2004/2005 to 2011/2012 crop seasons. The normalized difference vegetation index (NDVI) and the enhanced vegetation index (EVI) were used in time-series decomposed in harmonic terms by the harmonic analysis. In order to visualize the growing conditions of vegetation in agricultural areas, specially the phase information, the HLS transformation was applied to the harmonic terms obtained by the Hants algorithm, using Envi software. Sugarcane cultivation in the state of Sao Paulo shows spatial patterns that are coherent with the sugarcane development cycle and consistent with the variability of seasonal rainfall that directly affect the maximum period of vegetation indices. The peak growth stage of sugarcane occurs in years of normal rainfall; however, in years with below normal rainfall, sugarcane maturation phase is anticipated, and, in years with above normal rainfall, the growth phase is anticipated, which causes maturation delay.
Subject: Harmonic Analysis
Vegetation Indices
Image Processing
Remote Sensing
Editor: Empresa Brasil Pesq Agropec
Brasilia
Rights: aberto
Identifier DOI: 10.1590/S0100-204X2016001100009
Address: http://www.scielo.br/scielo.php?pid=S0100-204X2016001101868&script=sci_arttext
Date Issue: 2016
Appears in Collections:Unicamp - Artigos e Outros Documentos

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