THE MATHEMATICAL MODEL OF OPTICAL REMOTE SENSING SYSTEM SIGNAL CONSIDERING BROKEN CLOUDINESS EFFECTS
With increasing of the accuracy of measuring equipment for the optical remote sensing in recent years the requirements for speed and accuracy of the algorithms for satellite data processing has greatly increased. It became necessary accurately to account all of the known factors, which affect the si...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2015-04-01
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| Series: | The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences |
| Online Access: | http://www.int-arch-photogramm-remote-sens-spatial-inf-sci.net/XL-7-W3/1145/2015/isprsarchives-XL-7-W3-1145-2015.pdf |
| Summary: | With increasing of the accuracy of measuring equipment for the optical remote sensing in recent years the requirements for speed
and accuracy of the algorithms for satellite data processing has greatly increased. It became necessary accurately to account all of the
known factors, which affect the signal significantly. At each time, more than half of the planet is covered with clouds, so it is almost
always necessary to take measurements into breaks in clouds. Cloudiness is among those factors which affect significantly the signal
and its neglect in extreme cases can lead to an error of 140%. Here we propose a new solution of the radiative transfer equation
(RTE) for a slab of a turbid medium with consideration of broken clouds. We use the classical approach to solving RTE: complete
solution is represented as the sum of the anisotropic and regular parts. We express anisotropic part using small-angle modification of
the spherical harmonics method. For the regular part we propose to use quasi two-stream approximation. This method is a special
case of the synthetic iterations method. The method is based on splitting the ordinary iteration into two stages. At the first step one of
approximate methods is used, and on the second step one ordinary iteration is used. We use two-stream approximation as an
approximate method. In this paper we proposed a solution for the simplest case of broken clouds - cylindrical hole in the slab.
Comparison of the algorithm was performed with established program MDOM, and showed good agreement. |
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| ISSN: | 1682-1750 2194-9034 |