The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences. Vol. XXXVII. Part B5. Beijing 2008 
3.2 Surface measurement with Riegl LMS-Z420i 
To capture the surface of the necropolis as well as the 
surrounding area of the temple the Riegl laser scanner was 
chosen. In total 11 positions were used for these measurements 
(figure 16). The control points were determinate by rapid static 
GPS. At least 5 control points were visible on every single 
position. Using the software package RiscanPro the single point 
clouds were transformed into the reference system, with an 
accuracy between 1.5 cm up to 4 cm for a single registration. 
As shown below the scanner point cloud is very detailed but 
there are some gaps as a result of the local topographic 
conditions. 
Figure 16. Riegl scans (overview) 
3.3 Data Fusion TLS - DEM / Photogrammetric - DEM 
The DEM which was derived from the TLS was completed by 
the high resolution 50 cm photogrammetric DEM. So the area 
was extended and also the existing gaps were filled. Some 
accuracy investigations were done to compare the fitting 
between both data sets. Several subareas with complete 
coverage of TLS and photogrammetric elevation data were 
compared with the software Geomagic Qualify (Geomagic, 
2008, figure 17). The accuracy of the photogrammetric height 
data (based on the 25 cm GSD DEM) was determined with 
±18 cm. Therefore the TLS data were taken as the reference 
DEM, because of its higher accuracy. 
mm * 
Figure 17. Comparison of overlapping TLS and photogram 
metric DEM 
4. VISUALIZATION 
Based on different data resources, like aerial and terrestrial 
images, the unified DEM and several mid range scans by Z+F 
5003 and Z+F 5006, the Repit temple area and also the 
Asklepios temple, located between the tomb caverns at the 
necropolis, were visualized (figure 18). For that several 
software packages and tools were used; the workflow is shown 
in figure 19 [Wahl, 2008]. 
Figure 18. Mountain site with necropolis and Asklepios temple 
EasyNav 
Leica GPS 500 Rollei Metric AIC 
Figure 19. Visualization Workflow 
The Asklepios temple had been cut into the rocks, which also 
contains the tombs. The interior of this temple was scanned by 
the Zoller + Froehlich Imager 5006. The georeferencing, the 
data manipulation and the 3D modelling was done also with 
RISCAN Pro and Geomagic Studio. As a result a very precise 
3D model of the complete temple could be realised. Figure 20 
shows the main portal of the Asklepios temple and also several 
subsurface chambers. 
Figure 20. 3D-Model of the Asklepios Temple 
In addition to these visualisations a number of cross sections 
(figure 21) through this subsurface building were generated. 
Especially these precise cross sections are of great value for the 
documentation of this excavation site. Further on some flights 
through and overflight animations were created.