STATE GOVERNMENT AGENCIES
At the Ohio Department of Transportation, the digitizing of photo-
grammetric data using Kelsh plotters, the Bendix Datagrid, and the
AP/C analytical plotter is controlled by digital control computers.
The control computers are used to process the digitized data or as
terminals to transmit data to a large central computer.
The Texas Highway Department is working on the photogrammetric develop-
ment of a data bank for engineering (Howell, 1971). Through digitizing
methodology and computer software routines, the imagery extracted from
the aerial photographs (through a modified stereoplotter) is deposited
into a data bank for use in multidisciplinary engineering-management
applications. Once a data file has been built for the terrain surface,
it can then be used to generate cross-sections along any specified
baseline alignment which has been previously stored (Crawford and
Guess, 1974). 0
The Utah Agricultural Stabilization and Conservation Service has
developed an automated system for the production of rectified scaled
photographs (Dickson, 1974). The hardware includes a point-transfer
device, a monocomparator with digitizer and papertape, a minicomputer,
‘ and an autorectifier.
UNIVERSITIES AND PRIVATE ORGANIZATIONS
A study by the Control Data Corporation on the design of digital
image-processing systems (Lillestrand and Hoyt, 1974) concludes that
classical analog techniques for measuring and generating film images
are superior; however, digital techniques are superior for image
manipulation.
A Purdue University study on the application of ADP techniques to
digital photographs (Hoffer, Anuta, and Phillips, 1972) concluded that
ADP of digitized photography is suitable for small-scale photography
but must have close human supervision to avoid problems. Í 0
Researchers at the State University of New fork, Binghamton, developed
a multivariate model for automatic pattern recognition from thermal
infrared densities (Hsu, 1975).
A system developed at the Farth Satellite Corporation uses a combined
microdensitometer and monocomparator to measure XY and density values.
The output is a digital terrain model and a computer-generated hypso-
graphic map of the terrain (Van Rossel, 1972).
A procedure for automatic mapping of strip-mine operations from space-
craft data was developed at Bendix and Ohio State University (Rogers,
Reed, and Pettyjohn, 1974). Spectral recognition is used as a basis
for automatic target categorization and mapping.
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