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International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol XXXV, Part B5. Istanbul 2004 
  
Figure 3. Example of archive photo of 1936 (IFPO), showing in 
the foreground the archeological hidden remains 
c- Serie 3: These are photos existing in the archives of the 
DGA. All these photos were taken by the French air force of the 
Levant between the years 1931 and 1936. They are vertical 
views (figure 4). Only contact prints at a size of 13cm x 18cm 
are available; the original negatives were not found. Those 
contact prints were scanned. 
  
  
  
  
Figure 4. Example of archive photo of 1935 (DGA, area of 
Beaufort's castle), showing the castle (in the middle) and the 
landscape (focal length 26cm, flying height 1300m above 
ground, 2000m above sea level) 
3.2 The modern documentation 
After the end of the war, access to the castle became secure. 
There was a need to manage to realize a complete 
documentation of the unreachable parts of the castle (basically 
the eastern elevation over the valley). That's why a helicopter 
flight was scheduled in 2003. Aerial oblique views were taken 
(figure 1) in that flight. They were composed of digital images 
(Nikon Coolpix 5000, 2560x1920 pixels) and film-based small 
format color slides (Nikon F3, Nikkor lenses, 55 mm, scanned 
at a resolution of 3000x2000 pixels). Last but not least, a 
complete documentation requested terrestrial views of the 
castle; digital images and again film-based small format color 
slides were taken (figure 5). Thanks to this exhaustive 
documentation, three-dimensional restitution was possible. 
All the modern documentation was produced in one day. 
    
Figure 5. Recent terrestrial digital image (modern 
documentation, Nikon Coolpix 5000, 2003) 
3.3 The topographic survey 
On that same day, while photos were being taken, a team of 
geodetic surveyors installed reference points on the ground and 
elevations of the castle. These points (figure 6) were easy to 
identify on the photos. A total-station was used by the 
surveyors to measure the reference points. This generated three- 
dimensional coordinates for these points. 
  
3.4 The AutoCAD documentation 
The first topographic surveys conducted during the preliminary 
study were not very accurate due to the difficulties encountered 
in trying to access some of the areas of the castle. These first 
surveys were performed using GPS and tacheometric 
techniques. The AutoCAD maps (figures 7 and 8) used to 
establish the tender documents for the restoration of the castle 
were based on these surveys. The inaccuracies of these surveys 
did not represent a major problem for the restoration of the 
visible areas of the castle. However, these inaccuracies 
prevented us from computing the exact position of the 
archaeological hidden remains. We plan to generate a new 
AutoCAD documentation showing the surroundings of the 
castle and the archaeological hidden remains that should be dug 
out (85).