The National Geodetic Survey has programmed for a partial releveling of the first-order, national vertical control net and for readjustment of the entire first- and second-order net during 1977 through 1985. In the past, first-order, class I or II, double-run leveling was used exclusively to establish and relevel the first-order net. Programmed funds permit releveling and replacing destroyed marks on approximately half of the national first-order net by double-run leveling, or on essentially the entire net by new first-order, class III, single-run leveling. The new specifications, based on an analysis of leveling errors were field-tested on a level line from Waldorf to Baltimore, Md., between December 1975 and April 1976. Test results indicate that first-order, class III leveling can provide a viable alternative to first-order, class I leveling for releveling the first-order, national vertical control net. /Author/

  • Corporate Authors:

    American Congress on Surveying and Mapping

    Woodward Building, Room 430, 733 15th Street, N W
    Washington, DC  United States  20005
  • Authors:
    • Whalen, C T
    • Balazs, E I
  • Publication Date: 1977-3

Media Info

  • Features: Appendices; Figures; References; Tables;
  • Pagination: p. 45-58
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00163655
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jan 13 1978 12:00AM