Análise espacial da temperatura e albedo de superfície em bacias hidrográficas
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Data
2017-09-01
Autores
Padovanni, Naia Godoy [UNESP]
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Editor
Universidade Estadual Paulista (Unesp)
Resumo
O estudo dos fenômenos atmosféricos requer a compreensão de complexas relações e interações dos sistemas naturais e/ou antrópicos. As alterações da superfície terrestre alteram os processos de troca de energia entre a superfície e atmosfera em diferentes escalas, atuando na variação de temperatura da superfície e do ar, na intensidade dos fluxos de energia disponível na superfície e nas variações da energia armazenada na vegetação. A utilização de técnicas de sensoriamento remoto na compreensão dessas relações, a partir de uma abordagem geossistêmica, auxilia otimizando a obtenção de dados, no refinamento e acurácia destes e na análise sistêmica, tornando-se uma ferramenta importante para o entendimento dos processos ecológicos e antrópicos que agem nos sistemas terrestres. Neste contexto, este trabalho teve como objetivo a análise do comportamento espacial da Temperatura de Superfície (Ts) e albedo na Bacia Hidrográfica do Rio Una, Ibiúna – SP, a partir de imagens do sensor MODIS dos satélites TERRA e Aqua para os meses de Janeiro e Agostos dos anos de 2004, 2008, 2012 e 2015, considerando as modificações no uso do solo e ocupação da terra e as sazonalidades climáticas. A região de estudo vem sofrendo grandes mudanças no uso e cobertura da terra em função do crescimento urbano e das áreas de cultivo temporário e reflorestamento. Por fim, gerou-se um mapa da cobertura da terra para o ano de 2013, e a partir deste, realizou-se a análise do comportamento da Temperatura de superfície e do albedo. Os resultados obtidos foram comparados também com os dados de temperatura do ar e dados pluviométricos.
Atmospheric phenomena studies requires understanding about the complex relationships and interactions of natural and anthropic systems. Earth surface's changes alter the energy exchange processes between surface and atmosphere, at different scales, acting in : temperature variation of surface and air, the intensity of the energy streams available on the surface and the variations on energy stored in the vegetation. Remote sensing techniques utilization for the understanding of these relationships, in a geosystems approach, helps to optimize data acquisition, refinement and accuracy of these and systemic analysis, making it an important tool for the ecological and anthropic processes understanding, that act in terrestrial systems. In this context, the research's objective was the spatial behavior analysis of surface temperature (Ts) and albedo over the watershed area of the river Una (Ibiúna-SP), utilizing MODIS sensor images, from TERRA and Aqua satellites, captured in the months of January and August of 2004, 2008, 2012 and 2015, considering the changes in land use, land occupation and climatic seasonality. The study region has suffered major changes in land use and coverage on the basis of urban growth, cultivation areas and reforestation. So, a 2013 coverage map was generated, and from this, the behavior analysis of surface temperature and albedo was made. The results obtained were compared with the data of air temperature and rainfall data.
Atmospheric phenomena studies requires understanding about the complex relationships and interactions of natural and anthropic systems. Earth surface's changes alter the energy exchange processes between surface and atmosphere, at different scales, acting in : temperature variation of surface and air, the intensity of the energy streams available on the surface and the variations on energy stored in the vegetation. Remote sensing techniques utilization for the understanding of these relationships, in a geosystems approach, helps to optimize data acquisition, refinement and accuracy of these and systemic analysis, making it an important tool for the ecological and anthropic processes understanding, that act in terrestrial systems. In this context, the research's objective was the spatial behavior analysis of surface temperature (Ts) and albedo over the watershed area of the river Una (Ibiúna-SP), utilizing MODIS sensor images, from TERRA and Aqua satellites, captured in the months of January and August of 2004, 2008, 2012 and 2015, considering the changes in land use, land occupation and climatic seasonality. The study region has suffered major changes in land use and coverage on the basis of urban growth, cultivation areas and reforestation. So, a 2013 coverage map was generated, and from this, the behavior analysis of surface temperature and albedo was made. The results obtained were compared with the data of air temperature and rainfall data.
Descrição
Palavras-chave
Modis, Sensoriamento Remoto, Arcgis, Temperatura de superfície, Albedo, Remote sensing, Surface temperature