COMPARATOR CALIBRATION COMPUTER PROGRAM

This report contains a documented computer program for the calibration of comparators used for analytical photogrammetry. This computerized procedure is based on the measurement of 25 grid points whose coordinates are accurately known. The scale errors of the instrument x- and y-axes, as well as the lack of orthogonality are determined. The method of least squares and matrix inversion are employed to solve the unknown parameters. Statistical information such as the standard deviation of unit weight and confidence limits of the solved parameters are computed. A sample problem is included in the report. (FHWA)

• Corporate Authors:

  Federal Highway Administration

  Office of Implementation, 1200 New Jersey Avenue, SE
  Washington, DC  United States  20590
• Authors:
  • Chaves, J R
• Publication Date: 1972-10

Media Info

• Pagination: 45 p.

Subject/Index Terms

• TRT Terms: Aerial photogrammetry; Calibration; Cartographic grids; Computer programs; Coordinates; Data plotters
• Old TRIS Terms: Photogrammetric plotters
• Subject Areas: Highways; Safety and Human Factors; I83: Accidents and the Human Factor;

Filing Info

• Accession Number: 00335932
• Record Type: Publication
• Report/Paper Numbers: FHWA-RD-72- 48 Final Rpt., FCP 27A1-183
• Files: TRIS, USDOT
• Created Date: Dec 22 1988 12:00AM