Atmospheric Effect Correction (SMAC)

Functionality

The Atmospheric Effect Correction (SMAC) operation performs atmospheric correction on a Top Of Atmosphere reflectance image. The output raster map is computed by eliminating the effects of the atmosphere, and contains the reflectance on the Earth's surface.

The algorithm is an adaptation of the software SMAC (Rahman, H and Dedieu G., 1994). SMAC is a simplification of the Code 5s (Tanré D., et al., 1990) for the atmospheric correction of visible and near visible bands of several satellite sensors.

The input is an image with the reflectance at the Top of Atmosphere.

Then the correct coefficient file must be selected. Note that the coefficient file depends on both the sensor and the channel (for each sensor, several coefficient files are provided, one for each channel).

Subsequently, data must be provided for Optical thickness, Water vapor content, Ozone content, Surface pressure, Solar zenith and azimuth angles, and Sensor zenith and azimuth angles.

For each of the eight parameters you can provide:

The specifics of the SMAC computation are described in the following publications:

Rahman, H., and G. Dedieu, 1994 " SMAC : A Simplified  Method for  the  Atmospheric  Correction of Satellite Measurements  in the Solar Spectrum ". International Journal of Remote Sensing, 16:1:123-143.

Tanré, D., C. Deroo, et al. (1990). "Description of a computer code to simulate the satellite signal in the solar spectrum: the 5s code." International Journal of Remote Sensing 11: 659-668.

Tips:

Input requirements:

Domain and georeference of output map:

The ouput map will use system domain Value; the output map will use the same georeference as the input map(s).

Authors:

Acknowledgments:

Credits:

The SMAC coefficient files were computed by Béatrice Berthelot, François Cabot, Olivier Hagolle, Sophie Lacherade, Sebastien Marcq ou Manuel Grizonnet.

External links:

See also: