1bul 2004 
LASER SCANNING FOR TERRESTRIAL PHOTOGRAMMETRY, ALTERNATIVE 
SYSTEM OR COMBINED WITH TRADITIONAL SYSTEM? 
N. Demir', * , B. Bayram’, Z. Alkis’, C.Helvaci*, I. Cetin* T. Vógtle ^, K. Ringle , E. Steinle ^ 
| 
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| * YTU, Civil Engineering Faculty, 34349 Besiktas Istanbul, Turkey - (demir, bayram, zubeyde, chelvaci, 
| icetin)@yildiz.edu.tr 
| 
° Institut für Photogrammetrie und Fernerkundung, Universitat Karlsruhe, Englerstr. 7, 76128 Karlsruhe , Germany - 
(voegtle, ringle, steinle)@ipf.uni-karlsruhe.de 
Commission V, WG V/2 
KEY WORDS: Laser Scanning, Terrestrial, TLS, Terrestrial Photogrammetry, Modelling, Visualisation 
ABSTRACT: 
Traditional photogrammetric method has been a system for documentation, 3D modelling for long years. After the development of 
digital photogrammetrical systems, map products can be monitored in CAD platforms. Placing models in CAD had verified 
flexibility for getting information from model and easy editing for modelling. Terrestrial Laser Scanning Systems provide modelling of 
objects without scale and complexness. Likewise the combination of laser scanning method and photogrammetric method or taking 
in the consideration of the laser scanning method as an alternative method has been become a discussing topic. In this study, the study 
area has modelled with both systems and after completed the comparison and combination of the both systems. 3D Model of the 
building of University of Karlsruhe, Institute of Photogrammetry and Remote Sensing in Germany had been evaluated by 
photogrammetric method. The 3D model of same scenery had been created by terrestrial laser scanning method. Then the 
comparison of results from both systems had been done. To fusion the elevation data had been taken from laser scanning and the 
spatial data from photogrammetric evaluation. The process steps had been explained and the results given. 
1. INTRODUCTION * The way of scanning (360° scans, scanning specific 
sections because of limited fields of view ,scanning of 
profiles) 
+ The deflection system(sweeping or rotation mirrors) 
* The combination with other devices, mounted on the 
laser scanner. 
* etc. (Schulz, 2004) 
Architectural photogrammetry has a big role for correct, scaled 
documentation of buildings. By development of 
photogrammetric and laser scanning systems, creating of 
orthophoto, digital terrain models and monitoring has been 
become rapid, correct and economical. 
In last years terrestrial laser scanning systems have been got 
usefulness for modelling processes. Processes may be done 
without scale and complexness factor in laser scanning 
Systems. Modelling of complex shaped objects is created by 
point clouds in this system. All points of cloud have 3d 
coordinates. Another superiority of lascr scanning system is 
having tolls of data export at a file format. (Barber,2001) 
When the laser scanner operates, all points are referenced to 
internal coordinate system. If the object that has been modelled is 
complex shaped, a series of scans will be necessary. The 
multiplying scan series is be done by target points. 3d model is 
produced by laser software and the data may be exported in 
data export formats.(Bornaz, 2002) 
Compared to the photogrammetric approaches the use of the 
laser scanners has some advantages: 
+ Direct acquisition of 3D points 
The ability of ground based laser scanners to generate 
thousands of 3D points over surface of interest in just a few 
1 ^c 16 ali ~ Y Tor " ; 
TRS IS a a ppealiug concept (Gordon, 2001) + This systems deliver an enormous amount of 3D 
points on surfaces 
Stereo Close Range photogrammetry has been the main tool in ; : a = 
+ .— Excellent technique for the description of irregular 
the field of 3D modelling for many decades. Hence it is well x ; 
established technique , whereas laser scanning is a rather new surfaces relieves, sculptures, pillar capitals) 
method for three dimensional object modelling. Since both * Results are avaible in a very short term 
methods have their advantages and disadvantages, the goal is to 
extract the positive aspects of each, in order to decade which is 
suitable for certain application.(Vozikis, 2004) 
  
Differentiations of laser scanners in a technical way concern 
  
* Corresponding author.