AUTOMATIC RJfOTOGRAMMETRIC INSTRUMENTS
Fig. 1. The T-64 Orthophotoscope.
The U. S. Geological Survey has conducted
several experiments to determine the effective
mapping applications of orthophotographs
and orthophotomaps. The feasibility of com
piling the planimetry of an urban area from a
1:24,000-scale orthophotomosaic was estab
lished using a continuous-tone diazo rendition
of the orthophotomosaic printed on a white,
scribe-coated, scale-stable plastic. Planim
etry on a similar diazo print of this ortho
photomosaic was compiled in the field demon
strating the feasibility of combining the
compilation of planimetrie detail and its field
review and completion. Orthophotomaps are
being produced from an orthophotomosaic
prepared in quadrangle map format, with a
limited amount of added cartographic sym
bolization and marginal information, and
printed in several colors by lithographic
methods. Primarily only the degree of user
acceptance will determine the value of this
product which employs so many new and in
teresting techniques.
Gigas-Zeiss Orthophotoscope
One of the advantages of the Soviet Slot-
Rectifier FT-Shch 1 is the application of
projection apparatus with a very large depth
of field and thus sharp images independent
of projection distance. Recent orthophoto
graphs of high quality have been obtained
from an instrument described in “Considera
tions on the Design of the Gigas-Zeiss
Orthophotoscope,” by Dr. W. Bruchlacher
and Dr. M. Ahrend, Zeiss-Aerotopograph,
Oberkochen. This instrument is based on the
C8 Stereoplanigraph and consists of a scanner
(C8) with attached drive motors, control ele
ments and impulse generator for the Z-
motion, control desk with tape punch, and a
reproducing projector with a control desk
and tape reader.
The use of the punched-tape record in the
Gigas-Zeiss Orthophotoscope allows the pro
file information to be recorded during the
operator-directed profile scan in the C8
Stereoplanigraph and later used to control
the output in the orthoprojector. The five-
channel punched tape does not contain ab
solute A, Y or Z values of individual profile
points but rather stepping orders for X, Y
and Z. For terrain of different types the
length of the F-step is modified by an inter-
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