The purpose of this work was to develop a suitable computer program to correct computer compatible tapes, obtained from LANDSAT MSS data, and to study its effect on percentage of correct classification. The LOWTRAN-3 program, developed by the Air Force Geophysics Laboratories and based on a semi-empirical model, was used to calculate the atmospheric transmittance, in conjunction with Turner's model for correction of satellite data for atmospheric interference. It improved the contrast between different natural targets in the MSS LANDSAT data of Brasilia, Brazil. It also improved the classification accuracy of sugar canes by about 9%, in the MSS LANDSAT data of Ribeirao Preto, Sao Paulo, Brazil.

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