- 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, ...
The representation of the values of gravity by a formula (such as a gravity formula) or as the result of a hypothetical distribution of masses rotating with the Earth (such as a set of point masses or massive, simple geometric bodies)
Industry:Earth science
The process of aligning a gyroscopic compass in azimuth (north) without any external equipment.
Industry:Earth science
All water in the ground and lying below the surface of the ground, particularly that part lying in the zone of saturation. Also, and preferably, spelled ground-water.
Industry:Earth science
A telescope consisting of a paraboloidal primary mirror and an ellipsoidal secondary mirror place beyond the focus of the primary mirror. There is a real, internal image and the final image, projected through a hole in the primary, is erect.
Industry:Earth science
The value of gravity at a point, multiplied by the rate of change of geodial height with distance at that point. The horizontal component of gravity is zero under all circumstances, so the term is misleading.
Industry:Earth science
An approximation to the oblique Mercator map projection, based on the use of the aposphere as the surface onto which the rotational ellipsoid is first mapped, before finally being mapped onto the plane. This map projection is precisely conformal and the scale along the chosen central line is nearly enough constant over a restricted region for the map projection to be geodetically useful.
Industry:Earth science
(1) The vertical or sloping structure constructed to prevent an embankment or other earthen material from encroaching over the ends of a culvert. (2) The steep, wall-like cliff at the back of a cirque.
Industry:Earth science
Motions of the hands and arms made by the observer to direct his rodmen or chainmen.
Industry:Earth science
(1) That line, in a grid on a map, parallel to the line representing the central meridian or y-axis. (2) That line, in a rectangular, Cartesian coordinate system applied to a map, parallel to the line representing the y-axis or central meridian.
Industry:Earth science
Control established by control surveys on the ground, as distinguished from control established by photogrammetry using aerial photographs.
Industry:Earth science
