reason for omitting the need for stereo vision 
and for the use of an inexpensive document 
scanner and paper prints. Corrections could 
have been included to reduce the various 
distortions encountered but this would 
complicate the procedure and may prove to 
be beyond the comprehension of non- 
photogrammetrists. The most feasible way of 
improving the accuracy would be to digitize 
the diapositives in a larger, more precise 
scanner, at a higher density. 
REFERENCES 
Chen, Y, 1993. Development of Pseudo- 
stereo Method for Digital Map Revision. 
M.Sc.E. thesis, Department of Surveying 
Engineering, University of New 
Brunswick, Fredericton, N.B., Canada, 97 
pP. 
Derenyi, E., 1992. Design and development 
of a heterogeneous GIS. CISM Journal 
ACSGC, 45(4):561-567. 
NBGIC : (1991). “Province of New 
Brunswick Land and Water Information 
Standards.” New Brunswick Geographic 
Information Corporation, Fredericton, 
N.B., Canada. 
Rosenholm, D. (1986). Accuracy 
Improvements in Digital Matching. Phot. 
Reports, -No:2-. 52, Dept. of 
Photogrammetry, the Royal Institute of 
Technology, Stockholm. 
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