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International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol XXXV, Part B5. Istanbul 2004 
  
2. SYSTEM DESCRIPTION 
2.1 Description of System (sensors, parts, etc.), 
The special set constructed in 1999 for the acquisition of 
images on top of the monuments or excavations survey. It 
consists of a Ball or Zeppelin type balloon, a 3- axis servo-base 
and a 25-ressau metric Hasselblad camera. 
  
  
Image 3: Ancient walls were constructed as a hostile 
environment in order to avoid warriors overpasses them. 
The special set consist of the video telemetry system, the 
balloon, the 3-axis radio-controlled base the balloon and the 
gases fuelling cylinders. The 3-axis base is placed between the 
balloon and the metric camera and controls the 
Omega,Phi,Kappa placement of the camera. Camera operation 
and rotation is fully controllable from the ground due to a video 
link that transmits the acquired image to the ground. Therefore 
stereoscopic and monoscopic image acquisition is highly 
accurate, avoiding random image acquisition. 
     
P 2 
Image 4: The 3-axis radio-controlled base, the gases fuelling 
cylinders, the video telemetry system, the semi-metric 
Hasselblad 25-ressau camera and the balloon. 
2.2 System Transport 
The system can be easily transported to a medium sized car, 
therefore allowing a 2-person survey crew to easily and 
he Greek mainland and Islands. 
    
  
  
  
  
   
  
   
     
    
    
   
    
  
    
3. PHOTOGRAMMETRIC APPLICATIONS 
3.1 Usual Orientation Triangulation and Photogrammetric 
Procedures 
The balloon is now used from Topotech Surveys, GREECE as a 
platform for the acquisition of metric aerial images used for 
photogrammetric triangulation, stereo plotting, orthophoto, 3d 
Modelling & Virtual Reality Modelling & Creation. Five case 
studies are discussed were all kinds of photogrammetric 
products (Diagrams, Orthophoto, Elevations, Profiles, Contours 
and 3D-views) were produced. 
For the triangulation of images special targets are used. Thus 
the resulting accuracy and reliability is very high. Following 
are tri lation results. 
Parameter | X Y 
RMS Control 0.00 
5 
    
   
  
  
         
  
        
        
      
Z 
0.00 
6 
0.01 
4 
0.01 
0 
0.01 
XY 
0.01 
2 
0.01 
8 
0.00 
  
  
     
    
      
       
     
     
     
      
    
   
    
   
   
  
     
  
  
0.01 
0 
Dev 
RMS Check 
    
     
   
    
     
  
        
Mean Std 
       
     
  
     
    
     
     
Max 0.01 
5 
Residua 
| 3 8 
RMS I 4.6 5:0 
Table 1: Artificial Ground Control Special targets guaranty 
high accuracy and reliability. 
    
   
Network Adjustment is rarely required by project 
specifications. On the contrary sectioning, elevation drawings 
and stereoplotting is the most commonly used technique for this 
kind of applications. 
t > E 5 
Image 6: Techniques used 
3.2 Case Study 1: Mistras (Peloponissos) 
The excavations of the Gate of Nafplio were recorded in mosaic 
& diagram. Also 2243 meters of cobbled roads were surveyed 
by RTK GPS and reflector less Total Stations. 
  
  
  
  
  
    
  
Image 7: Project: Mistras