IMAGE SCANNING METHOD
Disclosed is an image scanning method, wherein an infrared line scanner is moved at different heights and at different speeds over a terrain in order to scan images of said terrain. The scanning rate of the line scanner is constant and is selected in such a way that no gaps occur between the linear image scannings in the predetermined height and speed areas, although overlappings may possibly occur. According to the invention, the method comprises the following steps: an overscan factor is detected according to the height and the speed of the line scanner over the scanned surface; a first image is centered; a misalignment vector is calculated for the images scanned thereafter according to misalignment of the images; the images are aligned with each other with the aid of misalignment vectors and the mean value of the content of the aligned images is determined in the image areas by means of the overlapping fixed by the overscan factor.