datum level - ορισμός. Τι είναι το datum level
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Τι (ποιος) είναι datum level - ορισμός

VERTICAL DATUM IN THE UNITED STATES
NGVD 29; NGVD29; NVGD29; NGVD; Sea Level Datum of 1929
  • Illustration of vertical datums in the United States.

National Geodetic Vertical Datum of 1929         
The National Geodetic Vertical Datum of 1929 is the official name since 1973 of the vertical datum established for vertical control surveying in the United States of America by the General Adjustment of 1929. Originally known as Sea Level Datum of 1929, NGVD 29 was determined and published by the National Geodetic Survey and used to measure the elevation of a point above and depression below mean sea level (MSL).
Vertical datum         
REFERENCE SURFACE FOR VERTICAL POSITIONS
Zero-elevation surface; Mean gravity surface; Reference height; Vertical reference system; Height datum; Zero-level elevation; Height system
In geodesy, surveying, hydrography and navigation, vertical datum or altimetric datum, is a reference coordinate surface used for vertical positions, such as the elevations of Earth-bound features (terrain, bathymetry, water level, and built structures) and altitudes of satellite orbits and in aviation.
Spirit level         
  • Machinists precision level
  • Carpenter's bulls-eye level
  • Measuring elevation with a line level. Historical archaeology at the old Champoeg townsite, Champoeg, Oregon (USA) 1973 (2149089991)
  • bull's eye spirit level]] mounted in a camera tripod
  • Torpedo level
  • Modern automatic level in use on a construction site
INSTRUMENT WITH A SEALED TUBE OF LIQUID, DESIGNED TO INDICATE WHETHER A SURFACE IS HORIZONTAL (LEVEL) OR VERTICAL (PLUMB)
Waterlevel; Spirit-level; Bubble level; Torpedo level; Tube level; Level (tool); Spirit Level; Carpenter's level
A spirit level, bubble level, or simply a level, is an instrument designed to indicate whether a surface is horizontal (level) or vertical (plumb). Different types of spirit levels may be used by carpenters, stonemasons, bricklayers, other building trades workers, surveyors, millwrights and other metalworkers, and in some photographic or videographic work.

Βικιπαίδεια

National Geodetic Vertical Datum of 1929

The National Geodetic Vertical Datum of 1929 is the official name since 1973 of the vertical datum established for vertical control surveying in the United States of America by the General Adjustment of 1929. Originally known as Sea Level Datum of 1929, NGVD 29 was determined and published by the National Geodetic Survey and used to measure the elevation of a point above and depression below mean sea level (MSL).

NGVD29 was superseded by the North American Vertical Datum of 1988 (NAVD 88), based upon reference to a single benchmark (referenced to the new International Great Lakes Datum of 1985 local mean sea level height value), although many cities and U.S. Army Corps of Engineers "legacy" projects with established data continued to use the older datum.