COMMISSION II 
PLOTTING THEORY, METHODS AND INSTRUMENTS 
1. Ambrose, W.R. 
McHail, R.R. 
United States 
THE ZOOM TRANSFER SCOPE 
A NEW PHOTOGRAMMETRIC INSTRUMENT 
The Bausch & Lomb Zoom Transfer Scope ZTS has recently been introduced to the photogrammetric 
community. It allows the rapid transfer or comparison of information from photographic images for map 
completion and revision and for detecting and recording changes revealed on film. The ZTS has broad 
applications in mapping, urban planning, geology, forestry, ecology, pollution control, military intelligence 
and other disciplines. 
The ZTS uses the camera lucida principle to enable the operator to see a recent aerial photograph and the map 
to be updated in superimposition. The photographic image can be optically magnified 1X to 14X with a 
continuous zoom system. It also has an optical stretch (anamorphic system) to compensate for image 
displacements on the photo due to terrain relief or camera tilt. 
2. Babcock, H.C. 
United States 
EVALUATION OF A STEREOCOMPILATION DIGITIZER 
This paper will describe the test and evaluation of a digitizing system used in conjunction with an anaglyphic 
stereoplotter, to produce digital cartographic data. As the map is compiled, digital data consisting of X, Y, and 
Z co-ordinates are automatically produced and recorded on magnetic tape. Also recorded is a feature 
identification tag inserted by the operator. Subsequent computer manipulation of the recorded data, and output 
through an automatic digital plotter produces a symbolized graphic. Operational tests have been made, using 
U.S. Army Topographic Command (USATOPOCOM) production operators, with encouraging results. The 
feasibility of compiling maps in this manner has been demonstrated, with the prospect of essentially 
eliminating the requirement for manual scribing of color separation negatives. 
3. Baboz, J. 
France 
NUMERICAL PHOTOGRAMMETRY AND 
AUTOMATIC CARTOGRAPHY 
The first part of this paper describes the magnetic recording device for co-ordinates designed by SOPELEM 
for the Presa RC plotter. Coded rules replace mechanical counters, the co-ordinate-instrument values are 
posted, and a computer transforms the Z co-ordinate into metric altitude H. Recording is done on a printout 
machine, on a punched tape or a magnetic tape, and recording can be set off either manually point by point 
or automatically with an adjustable rate. A control panel handles all controlling operations and enables codes 
to be introduced. 
With this device, IGN has made various numerical photogrammetric experiments for the purpose of collecting 
data prior to automatic cartography processing. The initial test showed that such a process could be used to 
save time and improve accuracy. The operating method is outlined, and the possibilities for future development 
of the process are indicated. 
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