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International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol XXXV, Part BS. Istanbul 2004
the restitution of three-dimensional elements simultaneously on
the photographs of 1936 and 2003, and to superimpose and
display these results within a unique project.
Figure 9. Overview of the camera stations and the block confi-
guration after the exterior orientation. At the right: a vertical
view of 1935 allowing the location of the camera stations.
4.6 Addition of other images in the project
Depending on the parts of the castle to model, any other recent
or archive image can be imported and oriented within the
project by identification of homologous points.
5. PREPARATION OF ARCHAEOLOGICAL
EXCAVATION
From the block of images previously oriented, the restitution
initially carried out in 2D in Autocad (e.g. fig. 7 and 8) will be
enriched by a 3D restitution corresponding to the objectives of
the documentation. We are then able to calculate and draw the
visible structures from the aerial and terrestrial photographs of
2003 by digitalizing on the images. One will proceed in an
identical way on the archive photographs to measure the
archaeological structures currently covered by the remains of
the war currently embanked or destroyed (fig. 10), or to plot in
3D parts of the castle (see §6).
Figure 10. Restitution of the embankment areas: on the left, the
boundary of the embankment is marked on a photo of 2003 and
on the right, the corresponding surface is projected on an
archive photo of 1936
The superposition of the two restitutions makes it possible to
highlight the areas of interest (figures 10 and 11) for
archaeological work and to estimate work of civil engineering
(fill, cubature, rebuilding, etc).
Morcover, the restitution of the site in wire frame and surface
model can be supplemented by the addition of textures coming
either from the images of 1936, or of those of 2003. From the
resulting 3D photomodels, orthophotos can be calculated for the
two periods, as e.g. for the frontages of the castle or the
installations around the site covering the archaeological
structures (fig. 11).
1936:
2003:
Figure 11. Archaeological structures are measured on the
archive images of 1936 and the corresponding surface is shown
on the photos of 2003
Figure 12. Example of orthophoto of the archaeological
structure (computed from an archive image of 1936).
6. RESTITUTION OF THE HISTORICAL
STRUCTURES NOWADAYS DISAPPEARED
The aim of the restitution is to help the consultant to establish
the framework of the excavation and restoration tasks, by
showing the destroyed historical structures.
The study is currently focused on different parts of the castle
(figure 13). For some of them (as courses of bricks or
stoneworks "label B"), a 3D restitution of both archive and
recent images is possible.
Parts recovered by embankment are modelled from only archive
images (watering place “label A”, counterscarp “label C" and
archaeological remains on the western part of the castle “label
127.