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PRECISION PHOTOGRAMMETRY SYSTEM "TPhotoS"
A labor-saving technology for econominal and quick photogrammetry using a non-metric digital camera
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| Example of the cut slope's behavior with "TPhotoS" | ||
Outline
TPhotoS, a precision photogrammetry system developed by Tobishima, calculates
on a PC, the 3-D coordinates of the survey points of the object from overlapped
digital photographs taken from different positions. All you have to do
on site is to take some photographs. The rest of the work can be done in
the office.
TPhotoS shortens field-surveying time, minimizing the surveyor's approach
to inaccessible areas and interruption of site works.
TPhotoS allows high precision surveying, with the error being as small as a few millimeters for a camera distance of 100m.
Being a simple system requiring no special knowledge or skill, TPhotoS is applicable to a wide variety of fields. Installation is possible in an arbitrary
direction , so ground displacement can be measured before excavation.
For example, we can grasp three-dimensional behavior can be understood
by installing it in a horizontal direction in order to ascertain the looseness
of tunnels during excavation.
Characteristics
(1)Specialized cameras are not required. Digital cameras available on the
market can be used since lens distortion etc. can be analytically rectified.
(2)It is not necessary to carry out standard survey methods, all you have
to do on site is to take some photographs.
(3)Many points can be simultaneously measured, so the distributions of a slope's behavior and the convergence of tunnels can be easily calculated.
(4)Depending on your needs, it is possible to survey the target areas repeatedly
as long as they are in the photographs.
Main field of application
(1)Measurement of slope behavior
(2)Measuring of tunnel convergence
(3)Modeling of ground shape
(4)Evaluation of ground displacement
Main achievement
(1)Measurement of slope behavior along a super-highway in Osaka
(2)Measurement of tunnel convergence on a moterway in Nagano
(3)Modeling of the shape of a tunnel entrance in Nagano
(4)A Full Scale Experiment at Tokachi Port, organized by the Independent Administrative Institution, Port and Airport Research Institute.
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