- Industry: Earth science
- Number of terms: 93452
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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 fractional part of a section (of a public-land survey) protracted by office procedures from field notes and designated by boundary limits, location and (not always) number on the township plat. A typical U.S. Patent description could be: Government Lot 1, Section 2, T 112N, R17W of 5th Principal Meridian.
Industry:Earth science
A randomly varying function which is not correlated with the other functions under consideration.
Industry:Earth science
(1) A quantity expressed in kilogal- meters is said to be expressed in geopotential units. It is equal to the difference in gravitational potential of two points separated by 1 meter when the gravitational field has a strength of 10 meters per second squared and is directed along the line joining the points. (2) The quantity 1 kilogalmeter.
Industry:Earth science
(1) The science dealing with natural changes of the Earth's form or structure. (2) The science dealing with the forces and processes of the interior of the Earth. The dynamics of the atmosphere is usually considered part of meteorology; the dynamics of the oceans is dealt with by oceanography and, in particular, by physical oceanography. The dynamics of the lithosphere has, in the past, been called physical geology or, where only the surface is of interest, geomorphology, physiography and physical geomorphology. The complement to geodynamics is geostatics, the science dealing with balanced states of the Earth.
Industry:Earth science
(1) Any function which is a solution of Laplace's equation and which has continuous first and second derivatives. (2) A function satisfying Laplace's partial differential equation, i.e., a solution of that equation. Often referred to, when the meaning is clear, as a harmonic. Laplace's equation was first solved using Fourier series, the terms of which (sines and cosines) are harmonically related. The term harmonic function was subsequently applied to all solutions of the equation. Other functions less obviously harmonic than sines and cosines are also solutions. Among them are Bessel functions, Legendre functions, and Lame' functions. The kind of harmonic function most suitable as a solution depends on the coordinate system in which the equation is expressed. Fourier series are best for Cartesian coordinate systems, Bessel functions for cylindrical coordinate systems, Lamé functions for ellipsoidal coordinate systems and so on.
Industry:Earth science
That branch of geodesy which deals with the relationships between sea level, water level and elevations.
Industry:Earth science
Angular variations in the direction from which radio waves arrive at an antenna, and caused by interference at the object.
Industry:Earth science
A magnetometer measuring the horizontal component, H, of the total intensity F of the magnetic field. A magnet suspended horizontally is set to swinging and its period of oscillation is measured. The period is a function of the intensity M x H at the magnet, where M is the magnetic dipole moment. The suspended magnet is then taken down and placed near a suspended, standard magnet of the same kind. Interaction of the two magnets causes one of them to turn by an amount proportional to M/H. The value of H can then be calculated from the two sets of measurements.
Industry:Earth science
