Abstract: In this paper, a computer technique for correcting lateral offsets within Landsat MSS imagery is introduced. These offset lines were produced by an apparently random line-start problem in the Landsat MSS sensor. Two values are needed to correct the offset:(1) the numbers of the line containing offset, and (2) the number of pixels of offset in the lines. The determination of these values is time-consuming by visual inspection on the display. Therefore, a computer program which makes use of correlation techniques or Sequential Similarity Detection Algorithms (SSDA) has been developed to calculate the above two values automatically, and then perform the required line shifts to correct the offset.