Laser scanning in Ostia a comparative study of accuracy of the drawings in 1950s and field survey on tall structures

A. Hanghai, Y. Hori

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1 Citation (Scopus)


In 2008, the field survey applying the laser scanning technology has been carried out at Ostia. The evidence for following results is based on the preliminary analysis of more than 150 stations, which is now being subjected to detailed analysis of the structure. The first part deal with a comparison between the drawings in 1950s and the result of our laser scanning in 2008 and analyze the causes of their failures. Calza, who applied the aerial survey in 1940s to create the first general map of Ostia, may draw the map by the simple way in which the street line may perhaps be traced from an aerial photograph. Consequentially his map includes considerable divergence. However the Decumanus Maximus in Calza's map was almost exact to the distance with a possible error 3 m (This is less than 0.1% errors). The second part deals with a continuing tilt that has brought the top of the walls 5cm out of true vertical in Capitorium and buildings facing Via di Diana and Via dei Balconi. Below the podium of Capitorium, large movement may be taking place in very slow motion, however there is no evidence of sinking at present. Where the cracks are observed on the surface, the high walls without openings do not support the weight of the roof, but is still resisting against wind loadings. In the front walls of buildings facing Via di Diana and Via dei Balconi tilting inward to the block, large movement also may be taking place. On the other hand a front wall of Casa di Diana standing on the true vertical is reinforced on the exterior by a wall buttress at the corner tilting inwards. The fact that there is no crack between the front wall and the buttress at the corner means that that buttress belongs to the later reinforcement.

Original languageEnglish
JournalInternational Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences - ISPRS Archives
Issue number5W1
Publication statusPublished - Jan 1 2009
Event3rd ISPRS International Workshop on 3D Virtual Reconstruction and Visualization of Complex Architectures, 3D-ARCH 2009 - Trento, Italy
Duration: Feb 25 2009Feb 28 2009

All Science Journal Classification (ASJC) codes

  • Information Systems
  • Geography, Planning and Development


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