The concept of using distances and azimuths to control aerial triangulation has been long established, but examples of practical implementation in commercial mapping have not been widely publicized. The underlying principles of one method of bridging with independent horizontal control are described. A block of four sidelapping flight lines containing 67 photographs at a scale of 1 in. = 500 ft was initially controlled for and bridged by conventional aerial triangulation procedures. The same project also was controlled and bridged according to the method of independent horizontal control. Comparison of coordinates of passpoints from the two methods of bridging showed rms differences of 0.58 and 0.60 ft in X and Y, reflecting good relative accuracy. Overall savings in producing mapping control amounted to 33 percent when the method of independent horizontal control was used as an alternate to the conventional method. Greater savings are anticipated for other projects. /Author/

  • Availability:
  • Corporate Authors:

    American Society of Photogrammetry

    105 North Virginia Avenue
    Falls Church, VA  United States  22046
  • Authors:
    • Kenefick, J F
    • Jennings, D E
    • Fusselman, W
    • Millichamp, N
  • Publication Date: 1978-6

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00185401
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Feb 3 1979 12:00AM