true vertical

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• true vertical — The local vertical or the line passing through the observer and the geographical poles of the earth. True vertical …   Aviation dictionary

• True vertical depth — [http://www.glossary.oilfield.slb.com/Display.cfm?Term=true%20vertical%20depth] is the measurement of a straight line perpendicularly downwards from a horizontal plane.In the petroleum industry, true vertical depth, abbreviated as TVD, is the… …   Wikipedia

• true vertical photograph — An aerial photograph taken with the optical axis of the camera perpendicular to the ground. In such a photograph, the principal point, the ground nadir, and the photo nadir coincide. Whereas the principal point is always the geometric center of a …   Aviation dictionary

• Vertical deflection — The vertical deflection (deflection of the plumb line, astro geodetic deflection) at a point on the earth is a measure of how far the direction of the local gravity field has been shifted by local anomalies such as nearby mountains. (Here gravity …   Wikipedia

• vertical air photograph — A photograph taken from the air with the optical axis of the camera perpendicular to the surface of the earth. Vertical photographs have practically a constant scale and are used to prepare maps and detect camouflaged objects. See aerial… …   Aviation dictionary

• True polar wander — is a phenomenon in which a planet or moon changes its orientation so that different points become the North and South Poles. This can happen when the two larger moments of inertia are near equal.The Earth is not a true sphere, and therefore has… …   Wikipedia

• vertical — I (New American Roget s College Thesaurus) Perpendicular to the earth s surface Nouns 1. vertical, perpendicular, upright; verticality, plumbness, aplomb, perpendicularity, orthogonality, elevation, erection; right angle, normal, azimuth circle;… …   English dictionary for students

• true prime vertical — The vertical circle that intersects the geographical poles and the true east and west points of the horizon, as distinguished from the magnetic, compass, or grid prime vertical through the magnetic, compass, or grid east and west points,… …   Aviation dictionary

• Vertical tangent — In mathematics, a vertical tangent is tangent line with infinite slope, thus being vertical. Definition Suppose the function fnof; ( x ) hold the point P ( c , fnof; ( c )). The graph of fnof; has a vertical tangent at P if one of the following… …   Wikipedia

• Vertical Horizon — Infobox musical artist Name = Vertical Horizon Img capt = Img size = Landscape = Background = group or band Alias = Origin = Washington, D.C., USA Genre = Alternative rock Pop rock Years active = 1992 ndash;present Label = Hybrid Associated acts …   Wikipedia

• True — Synonyms and related words: Christian, absolute, acceptable, accepted, accommodate, accord, accurate, accurately, active, actual, adapt, adjust, adjust to, apodictic, applicable, appropriate, approved, ardent, arrowlike, ascertained, assimilate,… …   Moby Thesaurus