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Eng ID | Term | Definition |
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321 | axis: vertical | In a THEODOLITE or TRANSIT, the line through the centre of the instrument about which the ALIDADE rotates. |
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322 | axis of camera | A line perpendicular to the FOCAL PLANE of the CAMERA and passing through the emergent nodal point of the LENS SYSTEM. Also called camera ax... more |
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323 | axis of channel | The centre line of a CHANNEL. See also TALWEG. |
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324 | axis of collimation | See COLLIMATION AXIS. |
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325 | axis of homology | In PHOTOGRAMMETRY, the intersection of the plane of the PHOTOGRAPH with the horizontal plane of the MAP or the plane of reference of the GRO... more |
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326 | axis of lens | The straight line which passes through the centres of curvature of the lens surfaces. Also called principal axis, optical axis or lens axis. |
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327 | axis of optical system | The line formed by the coinciding principal axes of the series of optical elements. |
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328 | axis of perspective | See AXIS OF HOMOLOGY. |
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329 | axis of spirit level | The line tangent to the surface of a spirit level tube against which the bubble forms, at the centre of the graduated SCALE of the LEVEL, an... more |
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330 | axis of tilt | In PHOTOGRAMMETRY, a line through the PERSPECTIVE CENTRE perpendicular to the PRINCIPAL PLANE. |
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331 | azimuth | A horizontal angle reckoned clockwise from the meridian. The horizontal direction of a celestial point from a terrestrial point, expressed a... more |
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332 | azimuth (of a celestial body) | The angle between the observer's MERIDIAN and the VERTICAL CIRCLE through the body, measured in the plane of the HORIZON. There is no univer... more |
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333 | azimuth: astronomic(al) | The angle between the astronomic meridian plane of the observer and the plane containing the observed point and the VERTICAL of the observer... more |
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334 | azimuth: astronomic(al) determination of | The determination of the AZIMUTH of a line or BASE LINE by ASTRONOMICAL OBSERVATIONS. |
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335 | azimuth: back | An AZIMUTH 180° from a given AZIMUTH. In GEODESY, the DIRECTION of the line BA as distinguished from the forward azimuth AB. The two differ ... more |
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336 | azimuth: forward | See AZIMUTH: GEODETIC. |
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337 | azimuth: geodetic | For the GEODESIC LINE from A to B, the angle between the tangent to the MERIDIAN at A and the tangent to the GEODESIC LINE at A. This AZIMUT... more |
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338 | azimuth: grid | The angle in the plane of PROJECTION between a straight line and the Y-AXIS of a PLANE-RECTANGULAR COORDINATE system. See BEARING: GRID. |
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339 | azimuth: Laplace | A GEODETIC AZIMUTH derived from an ASTRONOMIC AZIMUTH by means of the LAPLACE EQUATION. |
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340 | azimuth: magnetic | At the point of OBSERVATION, the angle between the VERTICAL PLANE through the observed object and the VERTICAL PLANE in which a freely suspe... more |