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Proceedings Paper

Atmospheric correction in the coastal zone on ASTER visible data allowing for the adjacency effect
Author(s): Tsutomu Takashima; Kazuhiko Masuda
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Paper Abstract

An algorithm to derive the effect of the land surface on the emergent radiation from the top of the atmosphere in the coastal zone is proposed. The surface is simulated by checkerboard type of terrain composing pixels, either land or ocean. The look-up-table method is used for the atmosphere- surface correction, where two parameters based on the diffuse transmission and reflection function of the atmosphere are introduced to investigate the contribution of adjacent pixels. These parameters are independent of the surface reflection properties. At present, the ocean surface is in accordance with the Cox and Munk model surface, whereas that of land is assumed to be Lambertian. The upwelling radiation emerging from the top of the atmosphere is expressed by a sum of radiative interactions between the surface and the atmosphere, and it is simulated using these parameters and combinations until convergence. An example of numerical simulation is shown at a wavelength of 0.56 micrometer, which corresponds to the center wavelength of the shortest channel of ASTER on EOS-AM1. The dust-like model is used for the aerosols and the land surface albedo is 0.2 or 0.4. The ocean wind is 5 m/sec and the refractive index is 1.333. The effect of the land surface on the radiance over the ocean is stronger just off the coastal zone and decreases exponentially with increasing of distance from the land. It depends upon the solar zenith angle and atmospheric condition as well. The present new version enables us to quantitatively discuss radiative transfer over the non-uniform composite surface including coastal zone. A typical numerical simulation is performed over the Tsukuba lake area in Japan.

Paper Details

Date Published: 23 October 1997
PDF: 12 pages
Proc. SPIE 3122, Infrared Spaceborne Remote Sensing V, (23 October 1997); doi: 10.1117/12.278990
Show Author Affiliations
Tsutomu Takashima, National Space Development Agency of Japan (Japan)
Kazuhiko Masuda, Meteorological Research Institute (Japan)

Published in SPIE Proceedings Vol. 3122:
Infrared Spaceborne Remote Sensing V
Marija Strojnik; Bjorn F. Andresen, Editor(s)

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