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

Distortion curve

Earth science; Mapping science

A curve representing the linear distortion caused by a lens system. It is plotted with radial distances of image points from the optical axis as abscissas and with radial displacements from their ...

External distance

Earth science; Mapping science

The distance from the intersection of the tangents (vertex) of a circular curve to its midpoint, measured along the line extending between the vertex and its centre of radius.

Great-circle direction

Earth science; Mapping science

The angle from a specified great-circle used as reference to the great circle in question.

Most significant digit

Earth science; Mapping science

That digit, in a number, which contributes most to the value of the number.

Direction number

Earth science; Mapping science

One of a set of any three numbers proportional to the three direction cosines of a line.

Direction

Earth science; Mapping science

(1) In surveying and mapping, the angle between a line or plane and an arbitrarily chosen reference line or plane. At a triangulation station, observed horizontal angles are referred to a common ...

Accumulated discrepancy

Earth science; Mapping science

The sum of the separate discrepancies which occur in the various steps of making a survey or of computing the results of a survey. For example, if two level lines, run independently over the same ...