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

Engraver subdivider

Earth science; Mapping science

A scribing device that permits selection of uniformly spaced ticks in subdividing or putting ticks on graticules or maps.

Dividing engine

Earth science; Mapping science

A machine, also called a ruling engine, for precisely drawing or incising equally spaced lines in material. It is used to produce diffraction gratings, the graduated circles on telescopes, ...

An ellipsoid which best fits the astro-geodetic network in a particular datum and hence does not necessarily have its centre at the Earth's center. More precisely, an ellipsoid whose dimensions and ...

Galactic equator

Earth science; Mapping science

That great circle of the celestial sphere which constitutes the primary circle of reference for galactic latitude and which passes approximately through the centre of the Milky Way. It is inclined ...

Two-step reduction

Earth science; Mapping science

Projecting and printing a small image, then copying and projecting it again to the required size. This is often necessary when the size of the copy or the limitations of the copying camera do not ...

Elinvar

Earth science; Mapping science

A variety of invar, composed of approximately 34% nickel, 57% iron, 4% chromium and 2 % tungsten. The springs in some spring type gravimeters are of elinvar.