Leveling
Geodetic leveling by the U.S. Geological Survey provides a framework of accurate elevations for topographic mapping. Elevations are referred to the Sea Level Datum of 1929. Lines of leveling may be run either with automatic or with precise spirit levels, by either the center-wire or the three-wire method. For future use, the surveys are monumented with bench marks, using standard metal tablets or other marking devices. The elevations are adjusted by least squares or other suitable method and are published in lists of control.
Citation Information
Publication Year | 1966 |
---|---|
Title | Leveling |
DOI | 10.3133/70045432 |
Publication Type | Report |
Publication Subtype | USGS Unnumbered Series |
Series Title | Topographic instructions of the United States geological survey |
Series Number | 2E1-2E5 |
Index ID | 70045432 |
Record Source | USGS Publications Warehouse |