Rectification, image enhancement, and mosaicking are accomplished digitally for low-resolution meteorologi-
cal and planetary-exploration satellites. When original film is recovered, processing is by conventional
techniques. However, a specialized optical-mechanical rectifier was developed for the high-resolution
panoramic camera used on Apollo. For use with the data from the Earth Resources Technology Satellite, a
ground data-handling system employing hybrid digital-analog techniques is used for distortion removal,
rectification, registration, and cartographic projection. A thematic-mapping system for automatic extraction
of information having unique spectral signatures is under development. An analytical triangulation program
developed for use with the Apollo metric camera records and combines tracking data, stellar photography, laser
altimetry, orbit theory, and photogrammetric conditions to develop a unified control point reference system.
14. Ferri, W.S.
Italy
THE GALILEO-SANTONI ORTHOPHOTOSIMPLEX
AND SOME ACCURACY TESTS
The Orthophotosimplex, an orthophotoprinter working in connection with the Galileo-Santoni Stereosimplex
Mod. IIc, has been manufactured at Officine Galileo, Florence, and the hardest tests soon started.
The right or left camera of the stereoplotter can be used indifferently as the projection camera. The
photography driven by an electric motor at uniform speed in the positive Y direction (selected among 2.5; 3.3;
4.4 mm/sec) is scanned by a slot 2.7; 4; 6.6 mm in length and 1; 1.35; 1.75 mm in width. The variation in
magnification following the Z/f ratio is obtained by an optical zoom system connected to the Z carriage of the
stereoplotter. The instrument works in a normally lighted laboratory. By the dropped line system, an auxiliary
optical device allows the photographic recording of height variations at the same moment of the execution of
the orthophotoplan.
The several tests carried out on the Orthophotosimplex have given excellent results both from the photographic
point of view and as regards the plani-altimetrical accuracy of the plotting.
Some tests carried out by grid plates with different focal lengths and different projection distances are reported.
So the obtained results are examined.
15. Forrest, R.B.
United States
A NEW STEREOPLOTTING CONCEPT
Present stereoplotting instruments are based on the principle of previous reconstruction; orientation of an
accurage object space stereomodel, followed by simultaneous image-data selection and positioning. The result
is a distinct set of characteristics, some of which are undesirable for certain applications. This paper describes
a stereoplotting concept based on independent reconstruction, for which image-data selection does not depend
on the accurate reconstruction of the object space model. One attribute of the concept is the separation of image
selection from image positioning. The characteristics of equipment based on the concept will differ from those
of present plotting devices and may prove more attractive for some applications. One implementation of
independent reconstruction, the image-space plotter, is described briefly.
16. Forrest, R.B.
United States
THE LR-2 LINE-DRAWING RECTIFIER
The LR-2 is a portable line-drawing rectifier that plots rectified line drawings of selected image details from
tilted aerial photographs. Packaged in three carrying cases, the unit has a total weight of 55 kilograms. It is
a digitized version of the LR-1, improved with respect to operator convenience, accuracy, and portability. The
operator traces features of interest on a tilted-frame photograph, a panoramic photograph, or an infrared or
side-looking-radar record, and a stylus simultaneously draws the rectified features at the desired scale. Tilts of
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