X = + 0.42 mm, my = + 0.32 mn, m, = + 0.75 mm,
average average average
m = + 0.62 mm, my = + 0.49 mn, m, : = + 0.97 mm.
max imum max i mum max i mum
Even though these results fell far short of the required accuracy
level, the attainable precision permitted the use of the photo-
grammetrically deduced data for the determination of the x- and
y- in-plane displacements in all ranges of loading, and the z -
deformations in the plastic range only. The structural group
considered the accuracy of z much too coarse for used in the
evaluation of the deformations and the deduction of the curva-
tures in the elastic range.
3.5. Preliminary Investigations
In an effort to explore all the avenues to increase the
accuracy of the stereometric systems to allow full utilization
of the photogrammetrically deduced deformations, theoretical and
experimental investigations (Karara, 1966) were conducted. The
theoretical studies were based on mathematical models simulating
stereometric coverages computed for a fictitious stereometric
camera (essentially composed of the metrical chambers of the
ZEISS SMK-40 and allowing degrees of freedom for convergence,
tilt, and base length). In the experimental test, a ZEISS
SMK-40 was used. Normal cases with b = 80 cm and b = 120 cm,
as well as convergent and tilted photography were simulated
using only one of the SMK chambers at a time.
As reported in Tokyo in detail, (Karara, 1966), both the
theoretical and the experimental results seemd to indicate that
a substantial increase in precision of the system (in X,Y, & Z)
was experienced as the convergence ( X in Fig.20) was increased
o O à
from 0° to 60°. The precision seemed to decrease, however,