Ito, Juko 
  
or the central plaza. Along the wall of the West Stoa continues a street beyond the Propylon, and three grave 
monuments were erected in line along its west side at about 1 m higher level from the street. 
The Grave Monument I was a rectangular building of ca.5.87 x 4.09 m with a sculpture of two flanking lions on the top 
of the elongated pyramidal roof. But the most of upper structure is gone. The wall of the east front had wings on both 
ends to emphasize its symmetricity. The Grave Monument II was an almost square building of ca.3.34 x 2.80 m most 
probably with a pyramidal roof. The Grave Monument III of 4.50 x 4.50 m was also a square building but, very 
peculiarly, with concave conical roof on its top. 
3 DATA AQUISION: TOPOGRAPHICAL AND ARCHITECTURAL SURVEY 
The whole area of the Stadion, ca. 200 x 150 m or 3 ha, was surveyed in the summer season of 1997. Our team brought 
a model helicopter which is 2 m long and 1 m high. (Fig. 1) A Hasselbrad camera with 6 x 6 cm film was mounted on 
its skids and a few hundred aerial photographs were taken for photogrammetry, because it was really difficult except 
this method to survey precisely and quickly such large area from block to block in only a few days. An operator on the 
ground could change camera angles and release the shutter by tele-control, watching a video monitor on which images 
of the ground were shown by a small CCD camera which was also mounted on the helicopter. Another operator 
controlled flight of the helicopter, repeating horizontal flight and hovering at different height. It took three days on the 
site to finish all the work like preparation of the helicopter, test flight, setting of bench marks, taking photographs, etc. 
Stereo matching and drawing were carried out using computer by Asia Air Survey in Japan (Fig. 3). 
  
  
396 International Archives of Photogrammetry and Remote Sensing. Vol. XXXIII, Part B5. Amsterdam 2000.