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PHOTODENSITY CONTROL SYSTEM FOR ORTHOPHOTO PRODUCTS

Orthophotoquad coverage at 1:24,000 scale in standard 7.5-minute format has recently become a major program of the U.S. Geological Survey (USGS). About 6,000 orthophotoquads were programmed for fiscal year 1977. For more than 20 years USGS has been developing instruments and techniques for orthophotography. Much of the effort concerned improvements in instrumentation, such as optical systems and offline operation. Until recently, little attention has been paid to photographic processing for orthophotography. Sample products were usually custom made, and there was no uniform photographic density control for mass production of quality orthophoto products. To meet the need, a photographic density control system has been devised for processing large blocks of orthophotoquads by project so that tone matching is achieved from quad to quad. Through complete densitometric monitoring of aerial film and all the subsequent photographic generations the exposure and processing parameters can be determined for producing orthophotoquads with specified density aim points.

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  • Supplemental Notes:
    • Presented at the Annual Convention of the American Society of Photogrammetry, Washington, D.C. February 27, 1976.
  • Corporate Authors:

    American Society of Photogrammetry

    105 North Virginia Avenue
    Falls Church, VA  United States  22046
  • Authors:
    • Brumm, M G
    • Waters, J G
  • Publication Date: 1977-9

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Filing Info

  • Accession Number: 00164879
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Nov 9 1977 12:00AM