- Industry: Earth science
- Number of terms: 93452
- Number of blossaries: 0
- Company Profile:
Founded in 1941, the American Congress on Surveying and Mapping (ACSM) is an international association representing the interests of professionals in surveying, mapping and communicating spatial data relating to the Earth's surface. Today, ACSM's members include more than 7,000 surveyors, ...
A line resembling the apparent horizon but lying just above or below it.
Industry:Earth science
That military grid which is designated as the official grid for a region and is depicted on a map by full lines.
Industry:Earth science
The determination of elevations using barometers. The quantities determined directly by barometric methods are altitudes, not elevations. However, they may sometimes be converted, by adding suitable corrections, to elevations.
Industry:Earth science
A gravity reduction not involving the theory of isostasy.
Industry:Earth science
That structure, at the top of a shaft, which houses hoisting equipment.
Industry:Earth science
A rotational ellipsoid characterized by the following constants:<br>
Industry:Earth science
A line parallel to that line, on a grid, which represents the equator.
Industry:Earth science
The computation of length and azimuth from coordinates on a grid.
Industry:Earth science
Any method which involves measuring the horizontal angle between a celestial body and the point whose azimuth is to be determined, and adding this to the azimuth of the celestial body as determined by calculation or from an ephemeris. Among the celestial bodies used for this purpose are Polaris (α Ursa Minoris), σ Octantis and various other readily observable stars.
Industry:Earth science
