International Archives of the Photogrammetry, Remote 
  
  
  
  
  
Sensing and Spatial Information Sciences, Vol XXXV, Part B7. Istanbul 2004 
  
  
  
  
  
  
  
e 
ce & 
| @ 
| 
Ld ol 
A 
12,4 
ES 
eo 2 
x S 
11,6 | 9,9 | 12,2 
| | 
33,6 
> 
  
  
Figure 11. Results of the 2D post processing: section, view and ground plane of the Holstentor in Lübeck 
6. ECONOMICAL ASPECTS 
Although it is fascinating to look at the projects from the 
technical and realisation point a view, it is absolutely necessary 
to check the projects from an economic perspective. All 
processing steps could be accomplished with a standard PC 
(256 MB RAM, 1.4 GHz AMD Athlon processor). In Fig. 12 
the total processing time needed for each individual processing 
step for each project is represented. In summary a ratio of 1:9 
for data acquisition to data post processing could be achieved 
for both projects. If more post processing is necessary due to 
more requested details in the 3D model the ratio would 
increase. It could be clearly seen in Fig. 12 that scanning needs 
only approx. 20% of the project time, whereas the remaining 
80% is used by registration and geo-referencing of the point 
clouds and by intensive post processing for the generation of 
the requested products. Thus, the measuring system permits the 
fast and comprehensive production of object-related measuring 
data. Furthermore, the scanned object can be virtually taken to 
the office in form of point clouds. Usually, details are rarely 
forgotten during the data acquisition due to the automated high 
resolution scanning of the objects. 
7. RESULT AND OUTLOOK 
In conclusion, in two different projects it was demonstrated, 
that the tested terrestrial laser scanning system is suitable for 
detailed 3D data acquisition and object modelling. The 3D laser 
scanning system Cyrax 2500 has been proven to be stable and 
simple to use. The level of detail, which can be set by the scan 
grid during the data acquisition phase, depends on the 
requirements of each application. The precision of the 
processed data is lem in Cyclone and 2cm in AutoCAD. This 
achieved precision could fulfil the requirements of the 
presented applications. Due to its measuring accuracy, its high 
point density, and its measurement speed laser scanning 
increasingly represents an alternative to and/or an additional 
option for geodetic and photogrammetric data acquisition 
methods. In particular, the use of the Cyrax 2500 for the 
recording of outdoor applications can be recommended 
although the camera-view scanner has a restricted field of view. 
In contrast to the outdoor use of the scanner, it would not be 
very efficient to use the CYRAX scanner for indoor 
applications because of the narrow field of view. 
946 
Int. 
Fi 
[n tl 
ben 
in tl 
scan 
geor 
deve 
the c 
a GF 
the | 
proc 
of th 
beco 
also 
betw 
contr 
the le 
Boeh 
[ 
p 
Cyra, 
(^ 
Cyra, 
St 
js 
Grün, 
ni 
Grün, 
Te 
Jahn, 
U 
de 
lis 
H: 
Johan: 
dij 
bu