- 行业: 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 barrier, made of stone, concrete, or wood, paralleling the side limit of a roadway to guide the movement of vehicles' wheels and to safeguard trusses, railings or other construction existing outside the side limit and pedestrians on sidewalks.
Industry:Earth science
(1) A number placed on a depth contour-line to denote the depth of the contour below a given surface. (2) A number placed on a chart to indicate a depth found at the indicated point by a sounding.
Industry:Earth science
(1) The interval of time between two successive occurrences of higher high water at a particular place. It is about 24h 50m long and is approximately equal to the lunar day (meaning 2 below). (2) The interval of time between two successive upper transits of the Moon over the meridian at a place. This is approximately the same interval as that defined in (1). Tidal day and lunar day are not the same. Lunar day is sometimes used instead of tidal day but is also used to denote the interval between two successive upper or lower transits of the Sun over a meridian on the Moon.
Industry:Earth science
A coordinate system defined by three families of surfaces, as follows: (a) longitude is defined by a family of numbered planes intersecting in a common line (the polar axis); (b) latitude is defined by a family of numbered, confocal hyperboloids with common axis on the polar axis; and (c) distance is defined by a family of numbered, confocal spheroids (rotational ellipsoids) having one of their common axes on the polar axis and their common center on the center of the family of hyperboloids. If the spheroids are oblate, the latitudes are given by single-sheet hyperboloids with common axis of rotational symmetry on the polar axis. If they are prolate, latitudes are given by two sheet hyperboloids.
Industry:Earth science
A single, unchanging number. Usually referred to simply as a constant.
Industry:Earth science
A coordinate in a coordinate system having its origin at the Sun's center.
Industry:Earth science
(1) The right which a husband has in his wife's estate at her death. (2) The estate to which, by common law, a man is entitled, on the death of his wife, in the lands or tenements of which she is seized in possession in fee-simple or in tail during her coverture, provided they have had lawful issue born alive which might be capable of inheriting the estate. It is a freehold estate for the term of his natural life.
Industry:Earth science
The condition placed, in photogrammetry, on three lines the line joining the perspective centers at the times of exposure of two photographs, and the two lines joining the point in object space to the corresponding points in image space that these lines be co planar. Also spelled co-planar. Denoting the lines by vectors y, x<sub>1</sub>, and x<sub>2</sub>, condition is x<sub>1</sub> x x<sub>2</sub> , y = 0. Although this condition has been used by several organ-izations as the basis for computer programs, it is not as versatile nor as widely used as the co linearity condition.
Industry:Earth science
A point, line or surface used as reference from which to reckon elevations or depths. It is called a tidal datum when defined by a certain phase of the tide.
Industry:Earth science
The amount subtracted from the period of a pendulum to account for its lengthening because the total mass of the pendulum is increased by gas absorbed on the surface.
Industry:Earth science
