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

Luni-solar diurnal constituent

Earth science; Mapping science

A tidal constituent which, together with the lunar diurnal constituent, expresses the effect of the Moon's declination on the tides. The two constituents together account for the diurnal inequality ...

Gravimetric datum orientation

Earth science; Mapping science

Adjustment of the reference ellipsoid, for a particular geodetic datum, so that the differences between the geoidal heights determined from gravimetric and astrogeodetic surveys are (usually in a ...

Standard coordinate system

Earth science; Mapping science

A rectangular, Cartesian coordinate system in a plane tangent to the celestial sphere at the point to which the optical axis of a telescope is directed. The positive η axis points towards the ...

Acoustic current metre

Earth science; Mapping science

An instrument which measures rate of flow in rivers and oceans by transmitting acoustic pulses in opposite directions parallel to the flow and measuring the difference in the time it takes a pulse to ...

Diagonal cheque

Earth science; Mapping science

Measurements made across opposite corners of the outside lines of a graticule to cheque the accuracy of the graticule or to cheque the scale of the graticule. A diagonal cheque has meaning only for ...

Crop

Earth science; Mapping science

Cut off or trim unwanted parts of a photograph. It is usually done by masking the image during printing.

Homogeneous coordinate

Earth science; Mapping science

In three-dimensional space, one of a set of four coordinates w 1 , w 2 , w 3 , w 4 assigned to each point in such a way that the points in Cartesian coordinates x,y,z are given by x = w 1 /w 4 ...