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3. Digital terrain models (Resolution 1) 
C.0. Ternryd - The application of photogrammetry to the different stages 
of highway design 
W. Blaschke - The application of orthophotomaps to highway design 
M.H. MacLeod — Semi-automated large scale mapping 
E. Benner & R. Schult - Report on a digital terrain model 
4. Semantic information 
  
K. Neumaier — An interpretation experiment 
5. Orthophotography 
  
R. Muller, M.C. van Wijk, J. Visser & L. van Zuylen - Production, performance 
and application of orthophotos and orthophotomaps 
6. Map revision 
G. Krauss, M.M. Thompson & E.W. Barton - Photogrammetric procedures for map 
revision 
|. Remote sensing 
G. Konecny - Geometrical aspects of remote sensing 
F. Leberl - Geometry of radar images 
8. Urban mapping 
R. Fôrstner - Basic maps for urban regions 
In addition, the following themes of interest were brought forward during the 
Delft Symposium, where ii was decided to raise them again during the Ottawa 
Congress. 
— Cartographic problems in photogrammetric processes 
— Checking procedures in photogrammetric mapping 
— Establishment of map evaluation system 
CHANGES IN THE FIELD OF COMMISSION IV OVER THE PERIOD 1968—1972 
  
As announced in the introduction, the main body of this report is concerned 
with the changes that have occurred in the field of this Commission since the 
previous Congress. In order to collect this information, a questionnaire was 
designed and distributed to all national correspondents. Replies were received