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Proceedings Paper

Small-angle atmospheric scattering of the light: outline of a theoretical model for adjacency effects on image remote sensing
Author(s): Alessandro Barducci; Ivan Pippi
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Paper Abstract

When observing a remote source through the Earth atmosphere the light scattering gives rise to a spurious signal which dims the source and compromises the measurement interpretation. In this paper this problem is re-examined. Our work has been limited to find a theoretical modelling for the optical radiation collected by aerospace detectors for image remote sensing. The model relies on the assump- tion that 'large-angle-scattering' and 'small-angle-scattering' are quasi-independent phenomena. It is qualitatively shown that large-angle-scattering is mainly originated on the first optical path (from the top of the atmosphere to the ground), while the second one principally contributes to the small-angle- scattering. The radiative transfer equation (RTE) that accounts for this phenomenon (path) is assessed. It holds for a turbid atmosphere with a free size-distribution of aerosol whose density is allowed to change with the quota. Due to the use of an unknown reflectance distribution of the ground, which is assumed to be uniformly lighted, the radiation field is allowed to be non-uniform for each layer of the accepted plane-parallel geometry of the atmosphere. The RTE so far obtained is solved by using the 'successive-order-method'. The solution is expressed by a superposing integral of the observed reflectance field, which is not space-shift-invariant. Finally, an approximate technique is described which allows the 'inversion' of the measured radiance to be achieved, and so the retrieval of the reflectance field.

Paper Details

Date Published: 21 December 1994
PDF: 11 pages
Proc. SPIE 2312, Optics in Atmospheric Propagation and Random Phenomena, (21 December 1994); doi: 10.1117/12.197360
Show Author Affiliations
Alessandro Barducci, Research Institute on the Electromagnetic Waves (Italy) and Univ. de Nice-Sophia-Antipolis (France)
Ivan Pippi, Research Institute on the Electromagnetic Waves (Italy)

Published in SPIE Proceedings Vol. 2312:
Optics in Atmospheric Propagation and Random Phenomena
Anton Kohnle; Adam D. Devir, Editor(s)

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