Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/72077
Type: Artigo de periódico
Title: SPECTRAL CHARACTERISTICS OF SOYBEAN DURING THE VEGETATIVE CYCLE WITH LANDSAT 5/TM IMAGES IN THE WESTERN PARANA, BRAZIL
Author: Mercante, E
Lamparelli, RAC
Uribe-Opazo, MA
Rocha, JV
Abstract: The objective of this study was to analyze changes in the spectral behavior of the soybean crop through spectral profiles of the vegetation indexes NDVI and GVI, expressed by different physical values such as apparent bi-directional reflectance factor (BRF), surface BRF, and normalized BRF derived from images of the Landsat 5/TM. A soybean area located in Cascavel, Parana, was monitored by using five images of Landsat 5/TM during the 2004/2005 harvesting season. The images were submitted to radiometric transformation, atmospheric correction and normalization, determining physical values of apparent BRF, surface BRF and normalized BRF. NDVI and GVI images were generated in order to distinguish the soybean biomass spectral response. The treatments showed different results for apparent, surface and normalized BRF. Through the profiles of average NDVI and GVI, it was possible to monitor the entire soybean cycle, characterizing its development. It was also observed that the data from normalized BRF negatively affected the spectral curve of soybean crop, mainly, during the phase of vegetative growth, in the 12-9-2004 image.
Subject: orbital images
atmospheric correction
image normalization
monitoring
Country: Espanha
Editor: Soc Brasil Engenharia Agricola
Rights: aberto
Date Issue: 2009
Appears in Collections:Unicamp - Artigos e Outros Documentos

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