- 行业: 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, ...
Something fundamental, essential, or irreducible which helps make up or define a larger whole. SEE, in particular, element, optical; element, orbital.
Industry:Earth science
In general, a polar diagram showing how rotational velocity in a fluid varies with depth. In particular, a polar diagram showing how the velocity of a wind-driven, oceanic current varies with depth. The Ekman spiral is often represented as a three - dimensional model (a helix); arrows representing speed and direction of the current are attached horizontally to a vertical rod on which the corresponding depths are shown.
Industry:Earth science
Projecting and printing a small image, then copying and projecting it again to the required size. This is often necessary when the size of the copy or the limitations of the copying camera do not allow enlargement in a single operation.
Industry:Earth science
A particular issue of a map, chart, or atlas different in time of issue and in some details from other issues.
Industry:Earth science
An elevation determined by two or more independent sets of measurements, or by a closed traverse, in which the results agree within a specified limit.
Industry:Earth science
A value HqdNh found for the elevation at a point PN using the formula <br>
Industry:Earth science
An rotational ellipsoid on which the gravity potential is constant and on which the value of gravity is given by a standard gravity formula.
Industry:Earth science
The condition, of a system, such that a small, temporary change in state results only in small, bounded, variations about the initial state.
Industry:Earth science
The condition in which two bodies in physical contact exist if they have the same (but not necessarily constant) temperature.
Industry:Earth science
The difference: hour angle of true Sun minus hour angle of fictitious mean sun.
Industry:Earth science
