Produção Nacional
Application of Landsat images for quantifying the energy balance under conditions of land use changes in the semi-arid region of Brazil
2012; SPIE; Volume: 8531; Linguagem: Inglês
10.1117/12.965882
ISSN1996-756X
AutoresAntônio H. de d. C. Teixeira, Fernando Braz Tangerino Hernández, Hélio L. Lopes,
Tópico(s)Solar Radiation and Photovoltaics
ResumoIn the Nilo Coelho irrigation scheme, Brazil, the natural vegetation has been replaced by irrigated agriculture, bringing importance for the quantification of the effects on the energy exchanges between the mixed vegetated surfaces and the lower atmosphere. Landsat satellite images and agro-meteorological stations from 1992 to 2011 were used together, for modelling these exchanges. Surface albedo ( �0), NDVI and surface temperature (T 0) were the basic remote sensing retrieving parameters necessary to calculate the latent heat flux ( �E) and the surface resistance to evapotranspiration (r s) on a large scale. The daily net radiation (R n) was obtained from �0, air temperature (T a) and short-wave transmissivity (�sw ) throughout the slob equation, allowing the quantification of the daily sensible heat flux (H) by residual in the energy balance equation. With a threshold value for r s, it was possible to separate the energy fluxes from crops and natural
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