TA3/P1 Comparator.
Abstract
Development has been completed on an new on-line computer-assisted three-stage stereocomparator, and three systems have been delivered to the Defense Mapping Agency. Referred to as the TA3/P1 comparator, the system is designed to rapidly measure large quantities of pass-point coordinates and ground-control-point coordinates from medium to high-resolution aerial photographs. Whereas conventional stereocomparators typically use computers for off-line processing of coordinate data, the new system uses an on-line general-purpose (PDP-15) computer which provides greater speed and flexibility. The computer assists the comparator operator in the maintenance of stereoscopy and in preliminary processing of the measurements made, and it also permits immediate detection of most large errors. With suitable changes in programming, the TA3/P1 can perform various photogrammetric operations. The new stereocomparator operates ways very much like an analytical stereoplotter. The operator views a stereoscopic model with a floating mark moved by handwheels and a footwheel. The camera geometry on which the digital computer bases its model-coordinate transformations is established by analytical interior and relative orientation. Computer programs automatically carry out selected editing procedures on the points measured. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1974
- Accession Number
- AD0922545
Entities
People
- Richard H. Seymour