A METHOD FOR REDUCING THE INDEX OF REFRACTION ERRORS IN LENGTH MEASUREMENTS

Modern distance-measuring instruments yield lengths which are limited in accuracy by errors in the determination of the index of refraction. This report describes a procedure of reducing the error in a simple manner, while permitting observations to be made at the time most convenient for the surveyor. The method involves determinations of length ratios and the calculation of triagles where the product of the ratios of the sides of the triangle equals one. Examples of the triangle computations are given. The results of some 500 measurements made in three different geographical areas shows that the improvement is about a factor of three. Further, any time of day or season of the year will provide measurements of equal quality, as long as all data used to form the ratios or groups of lines are taken within a short span of time.

  • Corporate Authors:

    American Congress on Surveying and Mapping

    Woodward Building, Room 430, 733 15th Street, N W
    Washington, DC  United States  20005
  • Authors:
    • Robertson, K D
  • Publication Date: 1975-6

Media Info

  • Features: Figures; References; Tables;
  • Pagination: p. 115-129
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00125392
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Oct 18 1975 12:00AM