Earth science

Earth science

Any of several geological sciences that are concerned with the earth, its origins, and all of its various structures and physical forms and phenomena.

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Earth science > 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 ...

diversion ditch

Earth science; Mapping science

(1) A ditch constructed to divert water from its natural channel. (2) An open, artificial waterway approximately parallel to the top of a cut backslope for preventing surficial ...

direction number

Earth science; Mapping science

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

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 center of radius.

diffusion transfer

Earth science; Mapping science

(1) A set of precisely spaced, parallel lines which cause incident electromagnetic radiation to be diffracted either upon reflection or upon transmission between the lines. (2) ...