- 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 amount of correlation between the intensity and/or phase of electromagnetic fields at points separate in space and time.
Industry:Earth science
A chart on a conic map-projection having two standard parallels.
Industry:Earth science
The organization which is responsible, by international agreement, for coordinating the measurements of time by national observatories and for providing an internationally acceptable, common time; it is also responsible for maintaining the international atomic second, i.e., providing to users a unit of time, the second, against which other standards can be calibrated. As part of its function, it calculates the position of the Earth's axis of rotation with respect to points on the Earth (SEE motion, polar), and changes in the Earth's rate of rotation. The Bureau was founded in 1919 and its offices since then have been at the Paris Observatory. By an action of the International Astronomical Union, the BIH ceased to exist on 1 January 1988 and a new organization, the International Earth Rotation Service (IERS) was formed to deal with determination of the Earth's rotation. The time keeping portion of the BIH was transferred to the Bureau International des Poids et Mesures (BIPM).
Industry:Earth science
(1) A mark made upon a tree trunk at about breast height by cutting out a piece of bark, leaving a flat scar upon the tree's surface. (2) A blaze, in the same sense as (1), with the proviso that a small amount of the live wood be removed also.
Industry:Earth science
The x-component of the representation, in a photogrammetric model, of the air base the line joining two camera stations.
Industry:Earth science
A coordinate system consisting of N straight lines (called the axes) intersecting at a common point (called the origin) and determining N-1 distinct, N-1 dimensional hyperplanes. The n-th coordinate (1≤n≤N) of a point is the distance between that point and the hyperplane determined by all axes but the nth, and measured parallel to the n-th axis. Alternatively, a set of N families of N-1 dimensional hyperplanes such that members of the same family have no line in common, while members of different families intersect in one and only one line. The coordinates of a point are then the set of values of the parameters determining the N hyperplanes passing through that point. The units in which distances are measured need not be the same along all the axes, and the axes need not intersect at right angles. A Cartesian coordinate system (CCS) for which the units of distance are different in different directions is sometimes erroneously called an affine CCS. If all the axes intersect at right angles, the system is called a rectangular CCS or simply a CCS. Otherwise, it is called an oblique CCS. Distances are usually measured from the hyperplane to the point and are assigned a positive or a negative value according to some specified convention.
Industry:Earth science
A device used for measuring short vertical lengths or distances, and consisting of a base, an upright, calibrated bar fixed to the base, and two horizontal microscopes that can be slid up and down the bar. It has been used in gravimetry for measuring the lengths of pendulums.
Industry:Earth science
