- Branche: 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, ...
The angle, in the plane of projection, between a straight line and the line (y-axis), in a plane rectangular coordinate system, representing the central meridian. In the State Plane Coordinate System established by the U.S. Coast and Geodetic Survey, grid azimuths were reckoned from south (0<sup>o</sup>) clock wise through 360<sup>o</sup>. To reduce geodetic azimuth to grid azimuth, a quantity (y <sub>2</sub> - y <sub>1</sub>
Industry:Earth science
A gray scale in which the transparency diminishes by discrete amounts from one end of the scale to the other, the amount being such that the perceived contrast is the same between all pairs of adjacent steps.
Industry:Earth science
The horizontal plane passing through the ground nadir of a camera station.
Industry:Earth science
That part of gravity, at a point, left after an amount varying systematically over a region containing that point has been subtracted from the total amount.
Industry:Earth science
The value of gravity force or gravity acceleration found by direct measurement, as by the use of a spring balance or a pendulum.
Industry:Earth science
A specially prepared, matte, plastic sheet which shows the sources of all soundings used in a bathymetric compilation.
Industry:Earth science
(1) In spirit leveling, the vertical distance, above the adopted surface of reference, of the intersection of the line of sight with the axis of rotation of a leveling instrument. (2) In stadia surveying, the height of the center of the telescope (horizontal axis) of a transit or telescopic alidade above the ground or station mark. (3) In trigonometrical leveling, the height of the center of the theodolite (horizontal axis) above the ground or station mark.
Industry:Earth science
The vertical distance, at any instant, between sea level and chart datum.
Industry:Earth science
A value of gravity calculated for a particular latitude according to an accepted gravity-formula.
Industry:Earth science
