8. The Advanced Automatic Compilation Equipment (AACE) uses
a calibrated all-electronic Scanning system to extract on tape the
X, Y, and Z coordinates from stereo photography using analog cor-
relation. The usual mechanical X-Y motion is replaced by a computer
controlled intertia-free scanning raster projected from a large CRT
onto the diapositive. The output tape is used to direct an off-line
orthophoto printer as well as to generate smooth contour plots.
9. A Digital Rectification Program System (DREPS) was de-
veloped to make possible the transformation of planimetric data,
digitized from non-orthographic photography, to a true orthographic
projection. Knowing the relationships between the camera, the data
digitized from the photography, and a digital terrain model (produced
by the Universal Automated Compilation Equipment UNMACE), any ray can
be traced from the camera station through the digitized data point to
intersect the terrain model. The ray intersection-terrain model search ( )
sequence is iterated until the point of intersection defines the cor-
rect orthographic X, Y position of the digitized data point.
10. CONSAC II (Contouring by the Surface Algorithm Concept) is
a FORTRAN IV computer software system for the computation of cartographic
quality contour lines from arbitrarily large Digital Terrain Models
(DTM's) produced by the Universal Automatic Map Compilation Equipment
(UNMACE). The basis of the CONSAC software is a mathematical modeling
technique which represents the terrain as numerous locally valid
polynomials.
ll. A computer system composed of a CDC 6400 computer, the Goodyear
Associative Array Processor (STARAN), and a PDP-11/50 mini-computer
has been installed in a complex to which is interfaced a COMTAL black/
white and color CRT, a Tektronix alphanumeric console, and a DICOMED
image processor. This provides a very flexible interactive digital
image processing system which will be used to investigate error-free
pass point measurement and stereo compilation.
FEDERAL HIGHWAY ADMINISTRATION
H. A. Lindberg
Modern photogrammetric and photointerpretation techniques are |
finding increased use in Federal and State highway programs. More |
than 150 double projection plotters, 30 optical train plotters, and |
15 comparators are owned and operated by highway agencies. In addition,
many highway agencies secure photogrammetric services by contract with
consultants. At least 15 agencies are now equipped for analytical
aerial triangulation, and others are using dependent or independent model
analog bridging. The use of digital maps and cross sections for design
and for earthwork payment purposes has increased. In a few agencies,
