ation of 
nerate a 
edes3D 
lera are 
; can be 
igitalen 
hrieben, 
erfolgt. 
erlichen 
ert. 
ufficient 
closing 
Nehr & 
vide the 
et al, 
sed 3D 
ems of 
  
International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol XXXV, Part B5. Istanbul 2004 
  
  
  
  
  
  
  
  
  
  
  
  
Fig. 3: Completing the profile from a second station 
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
    
  
  
  
  
  
px 
E i 
a 
JP df: 
eseut E 
i, 
y ue 
uA in 
oF dé Tu 
p t 
€ 3 
| | 
+ 
| M 
. - . dí. 
y 
ii 
“ + 
  
  
  
Fig. 4: Profile measurements, additional measurements of individual features and measurements of the surrounding polygon 
matching techniques in architectural applications are well 
known (e.g. low texture, identical features, surface 
discontinuities). 
A further approach is to derive the DSM from an existing 3D 
CAD model. This CAD model has to consist of closed faces (B- 
rep) and has to represent a high level of details (Wiedemann 
1996). To derive a 3D face model from punctual measurements 
can be a time consuming and challenging task. If such a 3D 
CAD model already exists, a generation of a orthoimage is 
usually not necessary anymore. 
2. MEASUREMENTS 
A lot of interactive editing or a very intelligent interpolation is 
necessary to create a DSM with the required point density when 
only a limited amount of input data is available. On the other