Mapping science

Mapping science

The systemic study of the processes and designs involved with map making.

Industry: Earth science

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Mapping science

Abney level

Earth science; Mapping science

A rectangular tube to one side of which is fastened a vertical, graduated arc with vernier and carrying a rotatable level. The instrument is small and light enough to be held in the hand. When ...

The azimuth of a line at the end (the end point) opposite that used for reference. If, on an ellipsoid, the azimuth of point B from point A is given, the back azimuth is the azimuth of point A from ...

Angle method of triangulation adjustment

Earth science; Mapping science

A method of adjusting a triangulation network, using adjustment by conditions, in which the measurements are of angles and the unknowns are corrections to the measured angles. The angle method is ...

Major axis

Earth science; Mapping science

(1) The longest line that can be drawn thru the centre of an ellipse or ellipsoid to the figure. (2) Any one of the set of lines of greatest length that can be drawn thru the centre and from one ...

Equatorial axis

Earth science; Mapping science

(1) A diameter of the Earth, drawn between two points on the Equator. (2) A line drawn thru the centre of an ellipsoid, in a plane perpendicular to the shortest axis of the ellipsoid, and extending ...

Backwater

Earth science; Mapping science

(1) A body of water held back from its natural course by some obstruction such as a contrary current, dam, etc. (2) A region affected by water held back from its natural course by some obstruction.