Estimativa do Albedo Comparando Metodologias de Correção Atmosférica em Áreas de Cana-de-Açúcar e Cerrado na Bacia do Rio Mogi Guaçú-SP (Estimation of albedo comparing methodologies of atmospheric correction in areas of sugarcane and cerrado in the ...)
DOI:
https://doi.org/10.26848/rbgf.v9.6.p1943-1955Keywords:
Sensoriamento remoto, Albedo, Landsat5.Abstract
O uso de técnicas de sensoriamento remoto nos últimos anos tem se tornado cada vez mais constante nas pesquisas sobre a cobertura vegetal, direcionando as mais variadas aplicações, principalmente quando se deseja analisar e identificar padrões de alteração no local estudado de forma clara e objetiva, visando assim obter maior conhecimento em áreas de difícil acesso. A eficiência na obtenção de dados gera resultados confiáveis principalmente com relação a dados meteorológicos com um baixo custo. O presente trabalho teve como objetivo a obtenção do albedo da superfície com base em imagens do TM Landsat5 e alguns dados meteorológicos obtidos através de estações micrometeorológicas em situ. A área de estudo está localizada no estado de São Paulo, na região da bacia do rio Mogi-Guaçu, município de Santa Rita do Passa Quatro, no estado de São Paulo (21°37’09”S; 47°37’56”W; 710 m). Foram utilizadas oito imagens TM - Landsat5 do ano de 2005 para os dias 22/02, 11/04, 29/05, 14/06, 16/07, 01/08, 17/08, 21/11. Foram empregados os procedimentos do Surface Energy Balance Algorithm for Land (SEBAL) proposto por Bastiaanssen (1995) aprimorados por Allen et al. (2007a) e Tasumi (2006) para obtenção do albedo superficial.
A B S T R A C T
The use of remote sensing techniques in recent years has become increasingly constant in research on plant cover, directing the most varied applications, especially when it is desired to analyze and identify patterns of change in the studied area in a clear and objective way, aiming to Knowledge in areas of difficult access. The efficiency in obtaining data generates reliable results mainly in relation to meteorological data with a low cost. The present study had as objective to analyze the albedo of the surface based on images of TM Landsat5 and some meteorological data obtained through micrometeorological stations in situ. The study area is located in the state of São Paulo, in the region of the Mogi-Guaçu river basin, municipality of Santa Rita do Passa Quatro, in the state of São Paulo (21°37’09”S; 47°37’56”W; 710 m). Eight TM - Landsat5 images from the year 2005 were used for the days 22/02, 11/04, 29/05, 14/06, 16/07, 01/08, 17/08, 21/11. The procedures of Surface Energy Balance Algorithm for Land (SEBAL) and superficial albedo of different authors were used. Estimates of the atmospheric correction showed that the albedo of the cerrado presents values inferior to the one found on sugarcane and other areas of the basin, except for water bodies. The different methods discussed in this study showed that the Idaho method presented the best results in the estimation when compared to pyranometric measurements presenting Relative Error lower than the methods presented here.
Keywords: Remote sensing, albedo, Landsat 5.
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Copyright (c) 2016 Maurílio Neemias Santos, Laurizio Emanuel Ribeiro Alves, Ismael Guidson Farias de Freitas, Eridiany Ferreira da Silva, Heliofabio Barros Gomes
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