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

Lead curve

Earth science; Mapping science

The curve between the switch and the frog in a turnout.

Geocentric coordinate

Earth science; Mapping science

(1) One of a set of three coordinates, of a point, in a geocentric coordinate system. The coordinates are commonly represented by (λ, φ', r) where λ, the longitude, is the angle from a reference ...

(1) One of two coordinates (r 1 , r 2 ) of a point in the plane, indicating the distances of that point from two given, fixed points in the plane. The coordinates do not give a unique location for ...

Dalby

Earth science; Mapping science

A formula for the reverse azimuth A 21 from point P 2 on a spheroid (rotational ellipsoid) to point P 1 on that spheroid, in terms of the forward azimuth A 12 from P 1 to P 2 and the forward ...

Contact screen

Earth science; Mapping science

(1) A transparent sheet carrying a pattern of fine, grey or magenta, vignetted dots of different densities. It is used to produce a half-tone negative by contact-printing. (2) A half-tone screen ...

Unrecorded deed

Earth science; Mapping science

A deed which is not properly recorded in a registry of deeds or other depository of public records. An unrecorded deed is binding on the grantor, his heirs and devisees, and on all other persons ...

External deflection of the vertical

Earth science; Mapping science

The angle, at a point P on the Earth's surface, between the theoretical direction of the vertical (opposite to the direction of gravity) and the actual direction of the vertical.