Abstract
MSS data from satellites or aircrafts are influenced by the atmospheric absorption and scattering generally called the atmospheric effects and by the shade of objects in the field of vision. On the other hand because the angular field of view of scanneres placed on aircrafts is usualy large, these effects chage in step with a change of scanning angle.
In this paper the relationship between the scanning condition and this kind of noise in the scanning direction is investigated. A method to remove it is proposed and is compared with usual methods. Further the correction effect of the proposed method on the land-use classification is examined.
Content of the result is summarized as follows.
(1) The shade and optical air mass do not have much an influence on the noise in the scanning direction and the shade effect is proportional to the scanning angle θi.
(2) The noise mainly depends on a change of the scattered radiation strength in step with a change of the angle ;is, between the scanning direction and the sun ray and it can be almost expressed by the second order formula for θsi.
(3) In comparison with usual methods to remove the noise, the simple method that we propose in this paper do not have serious effects on the original characteristic of covertures on the surface of the earth.
(4) The accuracy of the land-use classification fairly increeses by using this correction method.
