11 December 1998 Evaluation of evapotranspiration in an alpine forest catchment using satellite remotely sensed data
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Abstract
In this study daily spatially distributed evapotranspiration maps were estimated by integrating meteorological data-set, ground measurements, satellite images and Digital Elevation Model in a Geographic Information System environment to resolve latent heat flux as residual term of the one- dimensional surface energy balance equation. Study area was the Masino catchment located in northern alpine environment (SO, Italy), mainly dominated by forest land cover and characterized by steep slopes, variable aspects, cast shadows and great relief energy. A digital elevation model with pixel size of 25 X 25 m, was necessary to correct the Landsat TM scenes for the relief displacement using an orthorectification model and to correct the atmospherically effects using an improved image-based inversion algorithm based on a radiative transfer model. The procedure for estimating energy balance components was based on the evaluation of the energy balance equation distributing each component on the whole catchment. A simplified procedure was applied to relate instantaneous latent heat flux to actual daily evapotranspiration and the results were compared with that computed in correspondence to the meteorological station.
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Michele Meroni, Michele Meroni, Pietro Alessandro Brivio, Pietro Alessandro Brivio, Roberto Colombo, Roberto Colombo, Pier Paolo Ghezzi, Pier Paolo Ghezzi, Claudia Giardino, Claudia Giardino, Mario A. Gomarasca, Mario A. Gomarasca, } "Evaluation of evapotranspiration in an alpine forest catchment using satellite remotely sensed data", Proc. SPIE 3496, Earth Surface Remote Sensing II, (11 December 1998); doi: 10.1117/12.332712; https://doi.org/10.1117/12.332712
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