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Table 4. Standard deviation between coordinates measured with
tacheometer and from photogrammetric documentation.
dN (-dX) dZ (-dY) dE (-dZ)
[m] [m] [m]
Precision 0.09 0.06 0.19
Figure 14. Barrage Bl and Terrace TI locate at distances cf 45
m and 60 m, where the pixel sizes correspond to 4 cm and 6 cm,
respectively. The deviation between the image and tacheometer
measurements does not seemingly affect the location of the
entire structure. In case of Terrace T1, both lower and upper
lines of structure are measured. Due to occlusion, the other end
of the Terrace TI could not be measured on images.
errace 12
ower and uppe
A d =
o
tacheometer
image
measurement 1
— image
2 7 : measurement 7
Figure 15. Terrace T2 consists of two terraces, which are both
interpreted as lower and upper poly lines. They locate at
distances of 100 m from the photography, where the pixel size
corresponds to 10 cm. In case of photogrammetry, four poly
lines are observed twice. The internal deviation becomes clear.
This is due to the point wise interpretation of photogrammetric
measuring which becomes uncertain in direction of stereo
photography.
4. CONCLUSION
We have presented an approach in which photogrammetric
documentation could be used for 3-D measuring of structural
remains of barrage systems and terrace walls as part of
archaeological survey. The documentation is based on
International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol XXXV, Part B5. Istanbul 2004
panoramic stereo photography and natural control points has
been used for orientation of the images
New features of the procedure consist of the use of concentric
panoramic images in a photogrammetric 3-D reconstruction
process, the use of close up photography for exact
documentation and identification of the natural control points,
and the use of photogrammetric documentation by
archaeologists as their notebook during field invention.
The procedure is experimented and the results indicate that the
accuracy of applying panoramic imagery for archaeological
survey is satisfactory. However, point wise interpretation of
detailed structures leads to scattered shapes. We consider that
the scattering is mainly caused by stereoscopic imaging
geometry. Therefore we propose the use of corresponding
features instead of corresponding points when applying
photogrammetric documentation for 3-D structural recording.
ACKNOWLEDGEMENTS
The Academy of Finland, Jenny and Antti Wihuri Foundation,
and The Finnish Cultural Foundation are gratefully
acknowledged for financial support.
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