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matching strategies are being developed in conjunction with structu- 
ring of the image data, Use of external information, collective 
processing, and interactive operation tend to contribute substan- 
tially to the quality of the resulting DTM. Overall process strategy 
and associated quality control are important considerations. 
REFERENCES 
(1) Schulz, B.S. 
"Uber die Reduktion des Rauschens elektrooptisch abgetasteter Film- 
vorlagen", B.U.L., 49 (1981) 
(2) Makarovic, B. 
"Digital image registration by means of compressed data", Little 
Rock, USA, ASP/ACSM Fall Technical Meeting, 1977. 
(3). Hobrough, .G.L. 
"Envelope correlation for stereopsis" ISPRS Colloquium of W.G.s 
II-1, II-2, Enschede, October 1983 (unpublished) 
(4) Makarovié, B. 
"Image correlation algorithms", ISP Congress, Commission II, W.G. 
II-3, Hamburg, 1980 : 
(5) Ackermann, F. 
"Hochgenane digitale Bildkorrelation", 39th Photogrammetric Week, 
Stuttgart, 1983 
(6) Thurgood, J.D & Mikhail, E.M. 
"Photogrammetric analysis of digital images" ISPRS Commission III 
Symposium, Stockholm, 1982 
(7) Makarovié, B. 
"Regressive rejection - a digital compression technique" Little 
Rock, USA, ASP/ACSM Fall Technical meeting, 1977 
(8) Makarovié, B. 
"On performance of digital off-line systems for automatic production 
of DTM data" ISPRS Congress, Commission II, WG II-2, Rio de Janeiro, 
1984. 
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