Impact of surface emissivity and atmospheric conditions on surface temperatures estimated from top of canopy brightness temperatures derived from Landsat 7 data
Résumé
The method to derive surface temperature from top of canopy brightness temperature developed by Olioso (1995b) [20] is tested over the Avignon-Crau-Camargue area (France) using Landsat-7 ETM+ images. The difference between surface temperature and brightness temperature depends on surface emissivity, incident atmospheric radiation and the temperature itself. Differences up to 2 K were obtained for a surface emissivity of 0.97. It can increase up to 7 K when surface emissivity was 0.91. The surface temperature derived from Landsat data were in agreement with the ground measurements when using local calibration of the surface emissivity derivation method and a modification of the calculation of atmospheric radiation as compared to [20]. The impact of error in emissivity derivation was higher than the impact of errors in deriving atmospheric radiation.
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olioso IGARSS_emissivity paper 3040_{0647280C-F9C4-4DC7-8A69-76220F9FCBCB}.pdf (243.32 Ko)
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