- Industri: 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, ...
A person is said to have color of title if a claim to a parcel of real property is based upon some written instrument, although a defective one. The title appears good but in reality is not.
Industry:Earth science
Any clock in which the basic intervals of time are determined by reference to the resonant frequency of radiation absorbed or emitted by atoms or molecules. If the period is governed by the resonant frequency of molecules, the clock is preferably referred to as a molecular clock. Atomic clocks are commonly classified as active or passive according as they use radiation emitted by or absorbed by atoms. Typical passive atomic clocks are cesium clocks and rubidium clocks. Cesium clocks use cesium atoms for determining the basic intervals; rubidium clocks use rubidium atoms. Because the second is defined by international agreement as the length of time needed for a specified number of cycles of a particular frequency of radiation emitted by the cesium atom, cesium clocks are primary standards of time and frequency. Rubidium clocks have show smaller variations in frequency over short periods of time than do cesium clocks. The first complete and operating atomic clock was developed by H. Lyons and his associates at the U. S. National Bureau of Standards (NBS) in 1948-1949. It was actually a molecular clock; it used ammonia molecules for determining the basic frequency and interval of time. True atomic clocks came later and resulted from the work of L. Essen and his associates at National Physical Laboratory (England) and of Lyon and his associates at NBS from about 1952 onward.
Industry:Earth science
A measure of the amount of reflected sunlight which reaches the observer. It depends on the planet's location relative to the Sun and Earth and on the albedo of the planet's surface.
Industry:Earth science
A graphical representation of the errors, in the x-direction, of horizontal coordinates, with the errors plotted as ordinates against the x coordinates as abscissae.
Industry:Earth science
(1) A claim, to a tract of land, that is based on the assertion that title thereto was granted to the claimant or his predecessors in interest by a foreign government (before the territory in which it is situated was acquired by the United States of America). (2) The land so claimed.
Industry:Earth science
The level surface passing through the summit of Mount Everest (Chomulgunga). This is not the geoid; nor is it an approximation to the geoid.
Industry:Earth science
The smaller dihedral angle between the two vertical planes passing through the common exposure station and the principal points of the right and left oblique photographs taken by a trimetrogon camera.
Industry:Earth science
A method of orienting the stereoscopic models in a strip of photographs by using the Bz curve to find the difference between the true photographic nadir point and that indicated by a Multiplex type of stereoscopic plotting instrument. The strip of models can also be leveled by this method if the aircraft's altitude, as given by the altimeter, is used.
Industry:Earth science
