- Branche: 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 following set of numbers adopted in 1979 by the International Union of Geodesy and Geophysics:<br>
Industry:Earth science
A set of six first-order differential equations relating the rate of change of each of the six orbital elements to the rectangular components of the disturbing function. The components are usually those of the moving trihedron i.e., the tangent, normal and binormal to the orbit.
Industry:Earth science
A geodetic theory, introduced by Antonio Marussi, in which the coordinate system is completely defined by the Earth's gravity field and rotation, and geodesy is developed using only that coordinate system. The reference ellipsoid, geoidal heights and similar concepts are therefore not relevant in intrinsic geodesy. The theory was initially formulated using a special algebra devised by Marussi. It was translated by M. Hotine into the language of tensor analysis.
Industry:Earth science
A gravimeter which balances the force of gravity against a known and adjustable force, such as that of an extended spring or twisted thread.
Industry:Earth science
A sphere on which the features of the Earth's surface are shown, in their relationships to one another, by symbols and reference lines. It is usually made by printing an map or sections (gores) of a map on a flat sheet of paper, cutting the map or sections to the proper form, fitting the pieces to the globe, and cementing them in place. Terrestrial globes are usually between 20 to 100 cm in diameter. Larger terrestrial globes up to several meters in diameter have been made and show the Earth's surface in sculptured relief.
Industry:Earth science
A gravimeter designed to measure the value of gravity at a station.
Industry:Earth science
(1) A gravimeter of such construction it indicates the value of gravity (within the range for which it was designed) without having to be reset after every change of gravity. (2) A gravimeter having a single weight or spring arranged so that the sensitivity is proportional to the square of its period.
Industry:Earth science
The change in slope which occurs when the middle point of a surveyor's tape is not in a straight line with the ends. If the support for the middle of the tape is not in a straight line with the supports for the ends, that fact is noted as broken grade at. .., naming the particular length which contains the broken grade.
Industry:Earth science
That part of geodesy which does not depend on a knowledge of the Earth's gravity.
Industry:Earth science
