OFF-LINE ORTHOPHOTO PRINTER

A new optical orthophoto printer has been developed by the Rome Air Development Center. Digital profile data is required as in conventional systems; however, the off-line capability provides greater flexibility than was previously possible. The source of profile data is not inherently limited to direct plotter output but can be obtained, for example, from a digital terrain data base. Previously compiled profile data could be used to produce an updated orthophoto from more current imagery over a specified area. The optical orthophoto printer operates from camera parameters, orientation data, and digital elevation profiles, using a special purpose computer which computes model-to-photo transformation and derives the necessary servo control signals for the optical transforming elements and input and output photo and film carriage motions. In addition to rectification and orthorectification of vertical and convergent frame photography, non-conventional imagery may be used, i.e., imagery from the convergent optical bar camera used during the Apollo flights. The analytical flexibility of the system, with proper programming, allows present capabilities to the expanded to cover essentially any transformation needed. A program has been developed providing a capability for stereomate production. The system has reproduced 72 line pairs per millimeter high contrast targets and has provided very good quality continuous-tone imagery at accuracies of 30-407 CMAS. Scanning of the input is done at up to 10mm/sec which allows production of 9 by 9 inch orthophotos in 50-60 minutes. Further details of the printer performance reflecting an ongoing test program are presented. /Author/

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/00991112
• Supplemental Notes:
  • Presented at the Fall Convention of the American Society of Photogrammetry, Orlando, Florida, October 1973.
• Corporate Authors:

  American Society of Photogrammetry

  105 North Virginia Avenue
  Falls Church, VA  United States  22046
• Authors:
  • Scarano, F
  • Jeric, A
• Publication Date: 1975-8

Media Info

• Features: Figures; Photos; References; Tables;
• Pagination: p. 977-991
• Serial:
  • Photogrammetric Engineering and Remote Sensing
  • Volume: 41
  • Issue Number: 8
  • Publisher: American Society for Photogrammetry and Remote Sensing
  • ISSN: 0099-1112

Subject/Index Terms

• TRT Terms: Accuracy; Digital computers; Imagery; Optical instruments; Orthophotographs; Photographs; Printers; Transformations (Mathematics)
• Uncontrolled Terms: Rectification
• Subject Areas: Design; Highways;

Filing Info

• Accession Number: 00125367
• Record Type: Publication
• Contract Numbers: NAS 5-21822
• Files: TRIS
• Created Date: Oct 18 1975 12:00AM