Abstract:RESUMO:A prática agrícola da queima da palha da cana-de-açúcar tem por finalidade facilitar a colheita manual. No Estado de São Paulo, essa prática está submetida a uma rigorosa legislação ambiental devido ao impacto negativo para o meio ambiente. Está previsto que a queima da cana deve ser gradativamente eliminada até 2017. O presente trabalho tem por objetivo avaliar a área de cana colhida com e sem queima em todo o Estado de São Paulo. Para tal, foram utilizadas as imagens disponíveis do sensor TM a bordo d… Show more
“…However, Aguiar et al [6] reported, also for the state of Sã o Paulo, that during the 2006 season 3.24 million ha were harvested and that 33.5% (1.09 million ha) were harvested without straw burning and 66.5% (2.15 million ha) with straw burning. Comparing the results it can be concluded that from 2006 to 2008 the unburned harvested area increased by 0.84 million ha and the burned area decreased by 0.15 million ha.…”
This study's overarching aim is to establish the areal extent and characteristics of the rapid sugarcane expansion and land use change in Sã o Paulo state (Brazil) as a result of an increase in the demand for ethanol, using Landsat type remotely sensed data. In 2003 flex fuel automobiles started to enter the Brazilian consumer market causing a dramatic expansion of sugarcane areas from 2.57 million ha in 2003 to 4.45 million ha in 2008. Almost all the land use change, for the sugarcane expansion of crop year 2008/09, occurred on pasture and annual crop land, being equally distributed on each. It was also observed that during the 2008 harvest season, the burned sugarcane area was reduced to 50% of the total harvested area in response to a protocol that aims to cease sugarcane straw burning practice by 2014 for mechanized areas. This study indicates that remote sensing images have efficiently evaluated important characteristics of the sugarcane cultivation dynamic providing quantitative results that are relevant to the debate of sustainable ethanol production from sugarcane in Brazil.
“…However, Aguiar et al [6] reported, also for the state of Sã o Paulo, that during the 2006 season 3.24 million ha were harvested and that 33.5% (1.09 million ha) were harvested without straw burning and 66.5% (2.15 million ha) with straw burning. Comparing the results it can be concluded that from 2006 to 2008 the unburned harvested area increased by 0.84 million ha and the burned area decreased by 0.15 million ha.…”
This study's overarching aim is to establish the areal extent and characteristics of the rapid sugarcane expansion and land use change in Sã o Paulo state (Brazil) as a result of an increase in the demand for ethanol, using Landsat type remotely sensed data. In 2003 flex fuel automobiles started to enter the Brazilian consumer market causing a dramatic expansion of sugarcane areas from 2.57 million ha in 2003 to 4.45 million ha in 2008. Almost all the land use change, for the sugarcane expansion of crop year 2008/09, occurred on pasture and annual crop land, being equally distributed on each. It was also observed that during the 2008 harvest season, the burned sugarcane area was reduced to 50% of the total harvested area in response to a protocol that aims to cease sugarcane straw burning practice by 2014 for mechanized areas. This study indicates that remote sensing images have efficiently evaluated important characteristics of the sugarcane cultivation dynamic providing quantitative results that are relevant to the debate of sustainable ethanol production from sugarcane in Brazil.
“…Embora pesquisas (AGUIAR et al, 2009;MERCANTE et al, 2009;JOHANN et al, 2012;RISSO et al, 2012;MERCANTE et al, 2012;JUNGES et al, 2013) tenham obtido relativo êxito na utilização de sensores remotos orbital para o monitoramento da atividade agrícola, o principal desafio está em desenvolver uma metodologia sistemática sincronizada com as necessidades do mercado.…”
RESUMO O Estado do Paraná caracteriza-se por uma grande variabilidade de épocas de semeadura (DS) e, consequentemente, pelo desenvolvimento máximo vegetativo (DMDV), colheita (DC) e ciclo (CI) para a cultura da soja. O objetivo deste trabalho foi estimar essas datas para o período de primavera-verão do ano-safra de 2011/2012, por meio de séries temporais de imagens do Índice de Vegetação Realçado (do inglês Enhanced Vegetation Index - EVI) do sensor Modis (Moderate Resolution Imaging Spectroradiometer). Gerou-se um perfil espectrotemporal médio de EVI, considerando todos os pixels mapeados como soja dentro de cada município. Estes dados serviram de entrada no software Timesat para estimar os decêndios do ciclo da cultura (DS, DMDV, DC e CI) por municípios. Os resultados mostraram que existe grande variabilidade de datas de plantio em diferentes mesorregiões do Estado. Verificaram-se também divergências entre os resultados encontrados e os dados oficiais de DS e DC. A maior parte da semeadura (65,16%) esteve entre o terceiro decêndio de outubro e o primeiro decêndio de novembro. A maior parte da área de soja do Estado do Paraná (65,46%) teve seu DMDV em janeiro e colheita em março (53,92%).
“…Based on these maps, sugarcane harvest can be monitored with the use of remote sensing images which identify the type of harvest: green harvest (GH) or pre-harvest burning (BH) [6,9]. Partial results on the remote sensing harvest monitoring were published by Aguiar et al [10] and Rudorff et al [6] for crop years 2006/07 and 2008/09, respectively. The objective of the present work is to analyze a series of five years of continuous sugarcane harvest monitoring, based on remote sensing images, to evaluate the effectiveness of the "Green Ethanol" Protocol in anticipating the end of the sugarcane burning practice in São Paulo State.…”
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