- 行业: Earth science
- Number of terms: 93452
- Number of blossaries: 0
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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 factor used in making a harmonic analysis of tides or tidal current, because the tabulated hourly heights or speeds used in the summation for any constituent other than S do not in general occur on the exact constituent hours to which they are assigned but at times which may differ from the assigned times by as much as half an hour.
Industry:Earth science
(1) In riparian law, the gradual and imperceptible washing away of land by a stream or body of water such as a lake or sea. (BLM) The results of erosion of a stream may be distinguished from those of avulsion by the absence of identifiable upland between former channels and new channels. (2) The wearing away of land or structures by running water, glaciers, wind, or waves. Weathering, although sometimes considered a form of erosion, is a distinctly different process; it does not imply that material is removed.
Industry:Earth science
An ellipsoid containing a specified percentage of randomly distributed points in three dimensional space, or having a specified value of the quadratic form for the ellipsoid.
Industry:Earth science
Extinction encountered in passing through a planetary or stellar atmosphere. In particular, extinction of stellar radiation on passage through the Earth's atmosphere.
Industry:Earth science
The extension of detail, in a map, to the region outside the neat line.
Industry:Earth science
At the same potential everywhere. E.g., an equipotential surface is one on which a potential is defined and is the same at every point; an equipotential body is one at every point of which a potential is defined and is the same.
Industry:Earth science
The distance, measured along an established line from its intersection with a random line, to the corner on which the random line was intended to close.
Industry:Earth science
(1) A pair of perfectly flat, partly reflecting surfaces on glass or other transparent substance, placed parallel to and facing each other a short distance apart. In one form, two slightly wedge shaped plates of glass whose facing surfaces are exactly parallel, flat to 1/30 to 1/100 wavelength of green light, and coated with thin, partially reflecting metallic films are spaced a short distance apart. They are kept parallel by spacers. (2) A pair of parallel surfaces made highly reflecting by applying metallic films to them. Fabry Perot interferometers working at infrared and radio wavelengths are common.
Industry:Earth science
