PRESENT TREND IN PHOTOGRAMMETRIC INSTRUMENTATION

Abstract

A study of the history of development of photo-grammetric instruments reveals a gradual evolution govern-ing it. The entire period of development can be divided into three well-defined epochs qualified by distinct trends. First Period 1839-1918 The invention of the photographic process by Niepce and Uagurre in 1839 made possible the development of photogrammetric technidues. Col. Laussedat was respons-ible for the first photogrammetric camera and for develop-ing working procedures (1851-59) for the plotting of topo-graphic maps from photographs. He made use of two photo-graphs of an object taken from the end points of a base line so that, from each photograph a bearing could be derived for all points, the intersections of the pair of rays permitt-ing a point-by-point reproduction of the photographed object. In 1867 the first photo-theodolite was publicly exhibited by him in the Parts exhibition. Porro (Italy) and later, independently Prof.Koppe (Germany), in 1868, invented the principle of reprojection, which acquired a lot of importance in this period of ins-trument develop7ent. This basically implied that if the