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input materials. It is digitally controlled and uses laser light for 
image transfer. Still another high technology instrument that was 
described in Ottawa (Seymour and Whiteside, 1972), but implemented 
and delivered during this reporting period, is the TA3/P1 Computer 
Assisted Stereocomparator (Seymour and Whiteside, 1974). Three such 
instruments have been delivered and are in production use. Additional 
units are being built. 
The instruments mentioned in the preceding paragraph have 
been developed for special tasks and are used by U.S. Government 
agencies. Their commercial potential is minimal.  Undoubtedly, the 
technologies developed do have commercial potential; however, the 
process of technology transfer in photogrammetry seems to be slow and 
difficult, perhaps even more so than in other fields.  Encouragingly, 
some progress is being made. A Universal Stereoplotter (US-1) has been 
announced recently by Bendix. It is intended for the commercial market 
as a top-of-the-line instrument and makes extensive use of advanced 
technologies. 
Helava and Chapelle: "Epipolar Scan Correlation," Bendix 
Technical Journal, Spring 1972. 
Brumm and Scarano: "A Digital Grid-Point Elevation Data 
Collection System," Proceedings of ASP 
4lst Annual Meeting, March 1975, pp. 128-140. 
Elphingstone: "AS-11B-X Test and Evaluation," ASP 42nd 
Annual Meeting, February 1976. 
Roos: "The Automatic Reseau Measuring Equipment 
(ARME)", Photogrammetric Engineering and 
Remote Sensing, Vol. 41, No. 9, September 
1975, pp. 1109-1115. 
Jones: "Replacement of Photographic Imagery Equip- 
ment (RPIE)," ASP 42nd Annual Meeting, 
February 1976. 
Seymour and Whiteside: "A New Computer-Assisted Stereocomparator," 
Bendix Technical Journal, Spring 1972. 
Seymour and Whiteside: "A New On-Line Computer-Assisted Stereo- 
comparator," Proceedings of the ASP 40th 
Annual Meeting, March 1974, p. 386. 
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