The Measuring and Plotting of Scenes of Accidents and Crimes
| Published date | 01 October 1933 |
| Date | 01 October 1933 |
| DOI | http://doi.org/10.1177/0032258X3300600410 |
| Subject Matter | Article |
The
Measuring and Plotting
of
Scenes
of
Accidents and Crimes
How Photogrammetric Equipment Works
FOR many years photographs have been used to record
and construct
the
original conditions of accidents and
crimes, and special methods have been developed to reconstruct
certain distances and dimensions from single photographs,
but
these methods are rather slow and complicated, and the
results are not so accurate as directmeasurements with the tape.
The
development of stereophotogrammetry enables us
to use a stereoscopically seen model instead of single photo-
graphs.
This
method has been used for several years in topo-
graphical surveys, by means of stereophotographs and their
respective plotting.
The
firm of H. Wild in Heerbrugg, Switzerland, has
been manufacturing such photogrammetric equipment since
1923.
In
co-operation with the police forces, especially those
of Zurich, this factory has now succeeded in turning
out
special instruments, adapted to the use of the police, and by
which accurate plans of the scenes of accidents and crimes
are obtained.
With this special equipment
it
is possible to reconstruct
from a stereoscopic pair of photographs all the distances,
widths and heights of objects and to plot them true to scale
automatically. Compared with tape measurements, this
method has the advantage, that at any later time
the
drawn
plan can be completed or amplified by further data. Also
the stereoscopic observation of the photographs is a valuable
aid in obtaining a vivid impression of the actual conditions of
the scene.
By this stereophotogrammetric method all direct measure-
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