NEW DEVELOPMENTS IN EQUIPMENT FOR ANALYTICAL PHOTOGRAMMETRY 
by 
John D. Mayer 
INTRODUCTION 
The U. S. Army Engineer Geodesy, Intelligence and Mapping 
Research and Development Agency (GIMRADA), formerly the Topographic 
Department of the U. S. Army Engineer Research and Development 
Laboratories under the direction of the Corps of Engineers, has for 
a number of years been engaged in developing equipment and techniques 
for the extension of control and automatic map compilation. Extensive 
investigations on control net adjustment, primarily for the supply 
of individual model control to the mapping systems, have been made 
with mechanical means and are well known. Work on analytical extension 
of control by this Agency had been limited because of the computational 
time required. With the advent of electronic data processing systems, 
however, and their general acceptance for military use, the growth 
of analytical photogramme try procedures in the military regime was 
helped immeasurably. This concept required a complete reexamination 
of the mathematical approaches toward photogrammetrie solutions and 
a réévaluation of the errors, operational simplicity and efficiency 
and time factors in the data acquisition instrumentation. Clearly 
what was required was a data link that would supply accurate photo 
graphic coordinate data for the analytical procedures and would also 
supply unmistakable marked control points for the automatic map 
compilation equipment. 
This paper is presented to describe one such development (See 
Figure 1). The Automatic Point Marking, Measuring and Recording 
Instrument has been fabricated under contract with Link Division, 
General Precision, Inc., to provide the precise photographic coordinate 
and control point data very rapidly while reducing the operator 
decision-making function to a minimum. 
GENERAL DESCRIPTION 
As the name implies, this equipment is 
stereocomparator that has the capability of 
cally; marking, by means of heated die, the 
diapositive or film negative; and measuring 
essentially an electronic 
matching images electroni- 
selected images on each 
and recording the coordinates