CAPTIONS FOR ILLUSTRATIONS
Figure 1. Annotated mosaic of alternate routes for relocation
of U. S, Route 21 in Ohio. Original scale 1” = 800 ft.
The center line profile was obtained from existing USGS
topographic maps. Courtesy of Ohio Highway Department.
Figure 2. The Terrain Data Translator. This device auto-
matically records center line offsets and terrain elevations
for cross sections. Courtesy of Benson-Lehner Corporation.
Figure 3. The Electroplotter Model H. This instrument reads
x y coordinates from computer cards or tape. It auto-
matically plots the points and connects them with
straight lines. Courtesy of Benson-Lehner Corporation,
Figure 4. Printed output from earthwork computations. Courtesy
of Photronix, Inc.
Figure 5, Block diagram for a completely integrated photo-
grammetric-electronic highway design system. Courtesy of
Photronix, Inc.
Figure 6. The Stereomat. This instrument provides automatic
relative orientation, contouring, and profiling. Courtesy
of Benson-Lehner Corporation.
Figure 7. The reading head of the Integrated Mapping System.
The platen is used for visual observation of terrain
elevations during profile storage. It is then replaced by the
Vidicon which transmits a rectified image to the Ortho-
photoscope. Courtesy of Fairchild Camera and Instrument
Corp.
Figure 8, Highway design computed from Digital Terrain Model.
The plan, profile and mass diagram are plotted and
annotated automatically. Courtesy of Massachusetts
Institute of Technology, Massachusetts Department of Public
Works, and U. S. Bureau of Public Roads.
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