PRECISE GEOMETRIC CORRECTION OF MTSAT IMAGERY

摘要

This paper presents an approach to check a geometric performance of MTSAT imagery and demonstrate and evaluate a new approach to ensure more geometric accurately focusing on visible imagery in 1 kilometer. A series of processing is supplemented by ground control points of shore lines, land mark locations and digital elevation model. Firstly, a template matching technique is conducted to find a best matching point by simply moving the center of MTSAT sub-image over each point in a reference image of shore lines and calculating the sum of products between the coefficients and the corresponding neighbourhood pixels in the area spanned by the filter mask. Secondly, orthorectification processing is carried out to compensate for the geodetical distortions with respect to the acquisition condition including viewing geometry and so on. As a result, an average of root mean square sum of residual errors with system correction is found to be 5.71 pixels and that of precise geometric correction is 1.97 pixels. This shows that our approach ensures a more precise geometric correction than that of system correction and it results in the importance of a geodetic distortion compensation in high altitude area and off-nadir observation.