- Отрасли: 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 quantity δg <sub>BC</sub> obtained by subtracting, from a gravity anomaly Δg, (a) the free air gravity anomaly δg f, and (b) the cylindrical Bouguer gravity correction δg <sub>BC</sub>: Δg <sub>BC</sub> ≡ Δg - δg <sub>f</sub> - δg <sub>BC</sub>. The cylindrical Bouguer gravity correction introduces the mass of a finite disk instead of an infinite plate.
Industry:Earth science
A single, doubtful observation should be rejected if it is greater in absolute value than the value of a for which.
Industry:Earth science
A camera used in any of the several branches of photogrammetry. It is usually considered the same as a metric camera.
Industry:Earth science
An urban local generally recognized as the central commercial or residential part of a city even tho it does not have definite political, geographic, or economic boundaries.
Industry:Earth science
A metallic thermometer composed of two metals having different coefficients of thermal expansion. The scale was devised by the French scientist Jean Charles Borda, who placed a strip of copper on a strip of platinum, fastened the two together at one end, and by measuring the relative movement of their free ends deter-mined their temperature. He used this as a means of determining the temperatures of bars used in baseline apparatus. Later, Bessel used a combination of zinc and iron for the same purpose.
Industry:Earth science
A plane, taken to represent the Earth, whose rate of rotation, corresponding to the Coriolis parameter, varies linearly with the north south direction.
Industry:Earth science
That transitional zone which lies between earth and atmosphere and within which most forms of terrestrial life are commonly found. That part of the Earth commonly inhabited by plant or animal life. It comprises the outer portion of the lithosphere and hydrosphere, and the inner or lower portion of the atmosphere.
Industry:Earth science
Any chart on which great circles appear as straight lines. A chart on the gnomonic map projection.
Industry:Earth science
One of a set of perspective map projections devised by A. R. Clarke and projecting a truncated sphere onto a plane from a point between 1. 35 and 1. 65 radii from the center (the plane is not necessarily tangent to the sphere. ) In particular, that perspective map projection having the perspective center at a distance of 1. 4 radii from the center of the sphere and the plane at a distance of 0. 3537 radii on the other side of the center. If the graticule is centered at the sub solar point for any given instant, the boundary of the map will indicate the limits of the illuminated part of the Earth, including those parts influence by astronomical twilight. The map projection is therefore sometimes referred to as the twilight map projection or twilight projection.
Industry:Earth science
