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Description:"This simulated system study explores the potential of large format camera (LFC) photography for conducting photogrammetric control extension. The study is based on a series of error propagation analyses in photogrammetric triangulation of a block of 22 LFC photographs. The photographs, which have an approximate scale of 1:755,000, were taken during the October 1984 NASA shuttle mission STS-41G. Several present and future systems of data acquisition and reduction were simulated. A fixed geometric configuration of the block of 22 LFC photographs was used for all of the triangulation solutions in conjunction with existing ground control and simulated plate coordinates, as if they had been measured on the National Ocean Service analytical plotter. Block triangulation and error propagation solutions were obtained by statistically constraining certain combinations of parameters, such as plate coordinates, camera position and attitude, and ground control, in order to simulate a certain system. The General Integrated ANalytical Triangulation (GIANT) program was used for error propagation and block triangulation computations. The results are graphically portrayed as error curves for each of the systems simulated. The most accurate triangulation results are achievable when a system such as Global Postioning System (GPS), is used together with ground control in LFC photography block triangulation. Average standard deviations of coordinates triangulated ground points can be as low as ±2.9 m in planimetry and ±5.7 m in elevation. These correspond to photo accuracy of ±3.5 micrometers in planimetry and ±7.2 micrometers in elevation or a normalized system precision of ±1 m at a photo scale of 1:264,000 in planimetry and ±1 m ata photo scale of 1:136,000 in elevation. LFC attitude information from the stellar camera array (SCA) is also useful in conjunction with GPS for areas where the ground control is not available for use in block triangulation"--Abstract.
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Content Notes:Roop C. Malhotra, National Ocean Service, NOAA.
"August 1988."
System requirements: Adobe Acrobat Reader.
Includes bibliographical references (page 9).
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Rights Information:Public Domain
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