XI. International Congress of Photogrammetry 
Lausanne 8. — 20. July 1968 
  
INVITED PAPER 
GeormmissiorTv=v" 
Intercommission Working Group 
Civil Engineering 
Problems in Obtaining and Processing 
of Photogrammetric Data for 
Digital Terrain Models 
by 
Dr.-Ing. W. Blaschke, Hansa Luftbild, Münster