An automatic system which can fully replace the operator of a photogrammetric compilation instrument has not yet been developed, a fact which is perhaps not surprising in view of the wide range of mechanical and intellectual skills required in manual compilation. However, systems which automate the more routine operator tasks of stereo-perception and plotting have been successfully applied to a number of instruments. This paper discusses the use of electronic scanning and correlation techniques for the basic terrain-sensing function required in automatic stereoperception. It also shows how the information sensed by the correlation equipment can be used by the stored-program digital computer of an analytical stereoplotter to automatically plot contour and profile manuscripts. The final sections discuss potential approaches for improving the automatic stereoperception equipment and expanding the role of the computer to improve system performance and further increase the degree of automation.