- Branche: 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, ...
An amount of money set aside by a grantor and often managed by a third party, the trustee. Often constructed so one party receives income from the trust's investments and another party receives the residual value of the trust after the income beneficiaries' death.
Industry:Earth science
That part, of a line representing a meridian on a graticule, which extends above the top construction line of the graticule.
Industry:Earth science
A pair of photographs taken with two cameras so directed that their optical axes converge.
Industry:Earth science
A condition affecting the stereoscopic viewing of images by making horizontal and vertical distances appear to be at the same scale.
Industry:Earth science
A wall dividing two adjoining properties, usually (but not always) having half its thickness on each property, and in which each of the owners of the adjoining properties has rights of enjoyment. The parties may own it and the ground on which it stands as tenants in common (the usual common-law party-wall, or they may each own a part, as a half, in severalty and have easements in the other half, or one may own it and the other have easements on it.
Industry:Earth science
The value HNN found for the orthometric elevation of a point PN by dividing the potential function WN at the point (referred to the value of WN on the geoid as 0) by an approximation gNN to the average value of the gravity acceleration along the vertical between PN and the geoid: HNN = WN/gNN. WN is calculated from the measured differences ΔH <sub>n</sub> of elevation between points P<sub>n-1</sub> and P <sub>n</sub> along a route from point P <sub>o</sub> on the geoid to PN, and the measured or otherwise determined values g <sub>n</sub> of acceleration at these points: WN = Σ g <sub>n</sub> ΔH <sub>n</sub> (n = 1 to N) or, for infinitesimal separations dH between points along the route, WN = Σ <br>
Industry:Earth science
A chart drawn using the modified Lambert conformal map projection.
Industry:Earth science
That one of the two principal planes designated as the first (second) principal plane. It is usually the one closest to (farthest from) the source of the illumination.
Industry:Earth science
A photograph taken with the camera pointed obliquely downwards and as nearly perpendicular to the line of flight as possible.
Industry:Earth science
A hyperbolic navigation-system operating at frequencies between 10 and 14 kHz. The phase difference in the signal received from two stations is determined by the receiver. The receiver's location is known well enough, a priori, that the hyperbola determined by the measured phase difference can be drawn. The phase difference between signals from a second pair of stations is likewise measured, and the corresponding, second hyperbola drawn. The receiver is therefore located at one of the two intersections of these hyperbolas. In practice, only small hyperbolic segments in the vicinity of the estimated position are drawn. Omega is useful for navigation to about 9 000 km from the transmitting stations. The root-mean-square- error of a location is between 1 and 3 km; the lower values occur during daylight, when the ionosphere is lower and denser. By 1978 there were enough stations to make navigation by this method possible anywhere at sea.
Industry:Earth science
