- 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, ...
The condition, of a moving, inviscid fluid, in which the horizontal force per unit area exactly balances the horizontal pressure at all points of the field in question: 2 Ω x V = δ H p ρ , in which Ω is the angular velocity of the Earth, V the geostrophic velocity of the fluid, p the pressure, ρ the specific gravity and δ H the horizontal del operator. In geodetic applications, dynamic equilibrium results when the difference in hydro-static pressure between two points is balanced by the Coriolis force per unit area.
Industry:Earth science
The difference: apparent solar time minus mean solar time.
Industry:Earth science
A survey made to obtain information essential for planning an engineering project and estimating its cost. The information obtained may, in part, be recorded in the form of a map.
Industry:Earth science
The equation of a straight line which joins an identified point in object space to the corresponding point in the image and passes through the perspective center. A system of six photogrammetric equations referring to points on a single photograph suffices to determine the location and orientation of the photograph if the coordinates of the points in object space and in the image are known.
Industry:Earth science
The relationship existing between two perspective (e.g., aerial photographic) images such that a plane through the object - point and the two image points also passes through the epipoles.
Industry:Earth science
The instants when the geocentric angles between Venus or Mercury and the Sun are the greatest.
Industry:Earth science
An ephemeris which is broadcast from the satellite to whose orbit it refers.
Industry:Earth science
One (usually the vernal equinox) of the two points on the celestial sphere in which the celestial equator intersects the ecliptic at the time of an observation. Both the celestial equator and the ecliptic rotate in inertial space. The epoch (date) as well as coordinates of the points of inter-section must therefore be given in order to specify completely the locations of the equinoxes. The epoch is specified either by giving the Besselian year and fraction or by using the words of date, implying that the epoch is that of the instant of observation.
Industry:Earth science
The ascending node of the Earth's orbit; i.e., that intersection of the celestial equator with the ecliptic at which the Sun's declination is changing from south to north.
Industry:Earth science
