AUTOMATED IMAGE-TO-IMAGE REGISTRATION , A WAY TO MULTI-TEMPORAL ANALYSIS OF REMOTELY SENSED DATA Robert JEANSOULIN Laboratoire "Langages et Systemes Informati- ques". Centre National de la Recherche Scien- tifique. TOULOUSE. FRANCE. ABSTRACT. The digital overlaying of images is the only way to the multidimensional analysis of data, but a qualitative assessment. In Remote Sensing, the multi- temporal analysis is useful for studying the evolution of many physical phenomena, and now the merging of Vi- sible, near or thermal Infra-Red and Microwave data, opens a new field of investigations. A set of several methods - some of them are now classic ones - is shown in this chapter, and we try to point out the troubles met in automated registration : what happens to the physical content of the remotely sensed information with respect to the processing applied? KEY WORDS. Correlation, Edge Detection, Multitemporal Analysis, Rectification, Registration, Overlaying, Remote Sensing. Work sponsored by a research contract between the group of Professor BRUEL (Universite Paul Sabatier and ENSEEIHT) and the Centre National d'Etudes spatiales, "Etud es Thematiques" group of Mr. SAINT. 561 J. C. Simon and R. M. Haralick (eds.), Digital Image Processing, 561 - 577. Copyright © 1981 by D. Reidel Publishing Company.