TEST RESULTS OF FIRST-ORDER CLASS III LEVELING

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:
  • Surveying and Mapping
  • Volume: 37
  • Issue Number: 1
  • Publisher: American Congress on Surveying and Mapping

Subject/Index Terms

• TRT Terms: Field studies; Leveling; Specifications; Surveys
• Old TRIS Terms: First order surveys; Vertical control
• Subject Areas: Design; Highways;

Filing Info

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