Abstract
SUMMARYThe analysis of atmospheric effects on the radiometric quality of the data, provided by SPOT-1's High Resolution Visible (HR V) sensor in the multispectral mode, was carried out by comparing images with ground measurements synchronized with the passage of the satellite and by using water reflectances as standard reference. The results showed the calibration of reflectances in the image was reliable. In a heterogeneous area, the effect of the environment on the reflectance of a small target due to atmospheric scattering was analyzed and quantified from the radiative transfer model of the Laboratoire d'Optique Atmospherique in Lille, France (model 5S). We showed how the adjacency effect was correlated with lake size and atmospheric turbidity. With this model, we were able to infer from the image a value of the optical thickness of aerosols with a 20 per cent accuracy. Finally, the corrected satellite reflectances of atmospheric effects matched ground measurements with a 10 per cent accuracy.
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