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

refractive displacement

Earth science; Mapping science

Displacement of images radially outward from the photograph nadir because of atmospheric refraction. It is assumed that the refraction is symmetrical about the nadir.

distance modulus

Earth science; Mapping science

The difference between absolute and apparent magnitudes of a celestial body. e.g., the Sun's distance modulus is - 31. 57 m.

principal distance

Earth science; Mapping science

(1) The perpendicular distance from the internal perspective center of a projector to the plane, in the projector, of the photographic copy (finished negative or print). This ...

direction of the vertical

Earth science; Mapping science

The direction, at a point, of the downward pointing tangent to the vertical at that point.

displacement method of determining tilt

Earth science; Mapping science

A method of determining the amount of tilt of an aerial photograph by comparing the displacements of image points for which the vertical and horizontal coordinates of the ...

distortion compensation

Earth science; Mapping science

That correction applied to offset the effect, in a double projection, direct viewing stereoscopic plotter, of radial distortion introduced in an original negative by the objective ...