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AN AUTOMATED PHOTOGRAMMETRIC MAPPING SYSTEM 
Professor Paul R. Wolf, Ph.D. 
and 
Mr. Bon A. Dewitt 
Dept, of Civil and Environmental Engineering 
University of Wisconsin 
Madison, Wisconsin 53706 
BIOGRAPHICAL SKETCHES 
Paul R. Wolf is Professor of Civil and Environmental 
Engineering at the University of Wisconsin at Madison. 
He received his degrees from the University of Wisconsin- 
Madison, and also attended the University of Wisconsin- 
Platteville and Purdue University. He has formerly held 
appointments with the Wisconsin Department of Transporta 
tion, and Civil Engineering Department of the University 
of California at Berkeley. He is author of three textbooks 
and over fifty research articles. A member of ASCE, ACSM, 
ASP, and The Wisconsin Society of Land Surveyors, he is 
also registered as a Professional Engineer and Land 
Surveyor in Wisconsin. 
Bon A. Dewitt received his B.S. degree in Civil and 
Environmental Engineering at the University of Wisconsin 
at Madison, and is currently working toward his Ph.D. 
degree in photogrammetry at Wisconsin. He received the 
Student of the Year award in 1981 from the Western Great 
Lakes Region of the American Society of Photogrammetry. 
In 1982 he received the Bausch and Lomb Graduate Student 
Award in Photogrammetry. He is a member of ASP and is 
also a member of the Chi Epsilon and Tau Beta Pi honor 
societies. 
ABSTRACT 
This paper describes an automated analytical photogram- 
metric system for developing DTM data. Phases of the 
system which have been developed and will be presented 
include (a) correction for densitometry systematic errors, 
(b) image coordinate refinement based on automatic location 
of fiducial marks, (c) digital image correlation, (d) rela 
tive orientation, (e) absolute orientation based on auto 
matic location of ground control points, and (f) derivation 
of XYZ DTM coordinates. Results achieved to date on test 
aerial photos will be discussed. 
INTRODUCTION 
Photogrammetric techniques have been the principal method 
of generating topographic maps for engineering and other 
purposes. Presently, stereoplotters which rely on the 
optical or mechanical solution to the aerial photographic 
geometry are the most widely used method of creating these 
maps. These instruments require human operators to perform 
the mapping task. This is a labor intensive method which 
is subject to operator error. Advances in digital image