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Volumes / Journal / 28(2) - 2017 / Chiabrando F. et al.

Multi-temporal images and 3D dense models for archaeological site monitoring in Hierapolis of Phrygia (TK)

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Fig. 1 – a-b) Hierapolis Atlas (D’Andria, Scardozzi, Spanò 2008), map n°13 and n°35, zoomed excerpt on Bath-Church complex and eastern wall (sx) and Apollo Sanctuary and its Building A (dx); c-d) An image of the Bath-Church acquired by balloon (sx) and an image of Apollo Sanctuary (dx) from: https://www.hierapolis.unisalento.it/.

Fig. 1 – a-b) Hierapolis Atlas (D’Andria, Scardozzi, Spanò 2008), map n°13 and n...

Fig. 2 – The 3D model generated with 1996 images: a) (sx) Estimated position of the camera equipping the curbed balloon and (dx) 3D mesh and dense cloud from unsuccessful densification process; b) Terrestrial acquisition on eastern wall of Bath-Church in 2007 campaign with digital camera Panasonic Lumix DMC-FZ50 (sx) and orthoimage of the wall from close-range acquisition (dx); c) The pipes structure project in 2012 for support of internal and external front of the eastern wall (Mighetto, Galvagno 2012); d) LiDAR data in 2012, with and without the pipes structure: it supports the masonry wall displacement but it causes occlusion in wall documentation too (Invernizzi, Spanò, Alfieri 2014).

Fig. 2 – The 3D model generated with 1996 images: a) (sx) Estimated position of ...

Fig. 3 – a) 3D model from aerial photogrammetry in 2015 by Ebee flight: data is lacking in the area of the wall; b) LiDAR data with highlighted in blue the part concerning to the wall (sx) and in yellow (dx) the photogrammetric contribution of 2007 acquisition superimposed on the LiDAR data, in the central image beneath the data integration; c) Transversal section across the eastern wall.

Fig. 3 – a) 3D model from aerial photogrammetry in 2015 by Ebee flight: data is ...

Fig. 4 – a) The Apollo Sanctuary in (sx) reconstruction of 1st century AD (Giulio-Claudia Age, phase II) and (dx) 3rd century AD (Severian Age, phase III); b) The temple in the 2002 acquisition campaign: (up) the photos collection using a Rolleiflex camera by a man harnessed and suspended from a crane (down), the photonegative film and the photogram, with a zoom excerpt; c) The sacred area in 2015: the aerial photogrammetric acquisition by fix wing drone, after the archaeological accommodation of the Apollo sepulchre; camera position and orientation (sx), and dense cloud (dx).

Fig. 4 – a) The Apollo Sanctuary in (sx) reconstruction of 1st century AD (Giuli...

Fig. 5 – a) The Building A from 2015 acquisition by drone: orthoimage and extracted natural GCPs; b) The Building A from 2002 Rolleiflex acquisition: orthoimage; c) Views of point cloud densification (sx) and triangulated mesh (dx) with and without radiometric information, regarding the 3D model dated 2002 with Rolleiflex film camera acquisition; d) Investigation on density distribution of points clouds for (A-2002), mean density 36,400 pt/m³ (st.dev 11395), for (B-2015), mean density 1,500 pt/m³ (st.dev 358), and comparison between points clouds spatial geometry (mean discrepancy 0.06 m) and the mapping of changing areas.

Fig. 5 – a) The Building A from 2015 acquisition by drone: orthoimage and extrac...

Chiabrando F., Sammartano G., Spanò A., Semeraro G. 2017, Multi-temporal images and 3D dense models for archaeological site monitoring in Hierapolis of Phrygia (TK), Archeologia e Calcolatori 28(2), 10.19282/AC.28.2.2017.38