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Mapping science
The systemic study of the processes and designs involved with map making.
Industry: Earth science
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Mapping science
Echo sounder
Earth science; Mapping science
An instrument for determining the depth of water by measuring the time it takes a sound pulse to travel from the water's surface to the bottom and back, multiplying by the speed of sound, and ...
Dummy pendulum
Earth science; Mapping science
A pendulum similar in structure to working pendulums but equipped with a thermometer and fastened rigidly in its container so that it cannot swing during observations. The dummy pendulum is subject ...
Earthwork
Earth science; Mapping science
(1) Any operation involving moving large amounts of earth. (2) In particular, the operations connected with excavations and embankments of earth, in preparing foundations of buildings, in ...
Drop chaining
Earth science; Mapping science
Chaining in which the graduated tape is kept horizontal at each step, using a plumb line to correlate the mark on the tape with the mark on the ground. Also written drop-chaining.
Dot grid
Earth science; Mapping science
A positive photographic film showing an array of regularly spaced dots. The grid is used as an overlay in determining areas.
Orbital eccentricity
Earth science; Mapping science
(1) The eccentricity (1) of an elliptical orbit. (2) The eccentricity (1) of the osculating ellipse or average ellipse of an orbit.
Drift of a gravimeter
Earth science; Mapping science
A gradual change in the characteristics of a gravimeter, as determined by calibration.
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