## Glossary of Mapping, Charting, and Geodetic Terms |

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adjustment aerial altitude angle angular apparent applied approximately astronomical axis azimuth base bearing called camera celestial celestial body chart circle computed contour coordinates corner correction curve datum definition designed determined device difference direction distance earth effect elevation equal equator error established expressed field force geodetic geographic given graphic gravity grid ground horizontal indicate intersection interval latitude length lens light longitude magnetic map projection mark material mean measured meridian method moon motion negative normal object oblique observed obtained optical orbit orientation original parallel period photograph placed plane plate pole position precise principal printing produced quantity radar radial reading recorded reference reflected relative represented resulting rotation satellite scale showing sphere spheroid standard station surface survey tape term tide tion transit traverse triangulation true unit usually vertical

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Page 160 - Every particle of matter in the universe attracts every other particle with a force that varies directly as the product of their masses, and inversely as the square of the distance between them.

Page 160 - Every body continues in its state of rest, or of uniform motion in a straight line, unless it is compelled to change that state by forces impressed upon it.

Page 48 - Every particle of matter, in the universe, attracts every other particle with a force, which is directly proportional to the product of their masses and inversely proportional to the square of the distance between them.

Page 127 - The squares of the periods of revolution of any two planets are proportional to the cubes of their mean distances from the sun.

Page 147 - Map Projection — A systematic drawing of lines on a plane surface to represent the parallels of latitude and the meridians of longitude of the earth or a section of the earth. A map projection may be established by analytical computation or may be constructed geometrically...

Page 152 - Local mean time at the Greenwich meridian; the arc of the celestial equator, or the angle at the celestial pole, between the lower branch of the Greenwich celestial meridian and the hour circle of the...

Page 96 - ... geodetic meridian. A line connecting points of equal geodetic longitude. Also called geographic meridian. See astronomical meridian. geodetic parallel. A line connecting points of equal geodetic latitude. Also called geographic parallel. See astronomical parallel. geodetic position. A position of a point on the surface of the earth expressed in terms of geodetic latitude and geodetic longitude. A geodetic position implies an adopted geodetic datum, which must be stated for a complete record of...

Page 118 - Their wave lengths are longer than those of visible light and shorter than those of radio waves.

Page 123 - A radial from the isocenter. isostasy — A condition of approximate equilibrium in the outer part of the earth, such that the gravitational effect of masses extending above the surface of the geoid in continental areas is approximately counterbalanced by a deficiency of density in the material beneath those masses, while...

Page 228 - ... revolution from the fact that it can be formed by revolving an ellipse about one of its axes. If the shorter axis is used as the axis of revolution, an oblate spheroid results, and if the longer axis is used, a prolate spheroid results. The earth is approximately an oblate spheroid.