Measure of the downward gravitational force's shift due to nearby mass
For the CRT rastering method, see Cathode-ray tube.
Earth's ellipsoid, geoid, and two types of vertical deflection.
Ellipsoid of astro-geodetically oriented datum
Geoid
Gravimetrically-oriented ellipsoid
The vertical deflection (VD) or deflection of the vertical (DoV), also known as deflection of the plumb line and astro-geodetic deflection, is a measure of how far the gravity direction at a given point of interest is rotated by local mass anomalies such as nearby mountains. They are widely used in geodesy, for surveying networks and for geophysical purposes.
The vertical deflection are the angular components between the true zenith–nadir curve (plumb line) tangent line and the normal vector to the surface of the reference ellipsoid (chosen to approximate the Earth's sea-level surface). VDs are caused by mountains and by underground geological irregularities and can amount to angles of 10″ in flat areas or 20–50″ in mountainous terrain).[citation needed]
The deflection of the vertical has a north–south component ξ (xi) and an east–west component η (eta). The value of ξ is the difference between the astronomic latitude and the geodetic latitude (taking north latitudes to be positive and south latitudes to be negative); the latter is usually calculated by geodetic network coordinates. The value of η is the product of cosine of latitude and the difference between the astronomic longitude and the longitude (taking east longitudes to be positive and west longitudes to be negative). When a new mapping datum replaces the old, with new geodetic latitudes and longitudes on a new ellipsoid, the calculated vertical deflections will also change.
and 26 Related for: Vertical deflection information
The verticaldeflection (VD) or deflection of the vertical (DoV), also known as deflection of the plumb line and astro-geodetic deflection, is a measure...
sleeping policemen) are a class of traffic calming devices that use verticaldeflection to slow motor-vehicle traffic in order to improve safety conditions...
verticaldeflection plates to the phosphor screen as compared to the horizontal deflection plates. In very high speed oscilloscopes, the deflection plates...
steady sideslip) suddenly reverses as the vertical tail stalls. This may leave the rudder stuck at full deflection with the pilot unable to recenter it. The...
improved accuracy by means of "Laplace points" at special fixed points Verticaldeflection determination and their use in geoid determination in mathematical...
geometry of large deflection angles. It would have one set of windings in the horizontal deflection circuit and the other set in the vertical; the action of...
discontinuities at 360° and 0°. The sawtooth wave is the form of the vertical and horizontal deflection signals used to generate a raster on CRT-based television...
deflection yoke's vertical windings is relatively high, and thus the current in the yoke, and therefore the vertical part of the magnetic deflection field...
longitude can differ slightly from the ordinary longitude because of verticaldeflection, small variations in Earth's gravitational field (see astronomical...
called the deflection plates. The vertical amplifier generates a potential difference across one pair of plates, giving rise to a vertical electric field...
waveforms from the timebase amplifiers are fed to the horizontal and verticaldeflection coils wrapped around the CRT tube. These coils produce magnetic fields...
History of geodesy Horizon zenith angle Keyhole problem Subsolar point Verticaldeflection Horizontal coordinate system Analemma Jones, Daniel (2011). Roach...
Ecuador. Arriving and climbing the volcano in 1738, they conducted a verticaldeflection experiment at two different altitudes to determine how local mass...
input amplitudes, a switch selects calibrated sensitivity of the verticaldeflection. Another control, often in front of the calibrated selector knob...
"the vertical") and the perpendicular to the ellipsoid (sometimes called "the ellipsoidal normal") is defined as the deflection of the vertical. It has...
Among all these sources of error, it was mainly an unfavourable verticaldeflection that gave an inaccurate determination of Barcelona's latitude and...
geodetic latitude and geocentric latitude. Smaller deviations, called verticaldeflection, are caused by local mass anomalies, such as mountains. Tools exist...
the magnitude of the voltage in output will increase linearly. A verticaldeflection can be defined as {(A+B)-(C+D)}/(ABCD) so that now positive and negative...
waveform is shown on a signature display using verticaldeflection for current and horizontal deflection for voltage. This unique analog signature represents...
A deflection yoke is a kind of magnetic lens, used in cathode ray tubes to scan the electron beam both vertically and horizontally over the whole screen...
Among all these sources of error, it was mainly an unfavourable verticaldeflection that gave an inaccurate determination of Barcelona's latitude and...
swept horizontally by a sawtooth wave at the sample rate while the verticaldeflection was controlled by the input analog signal, causing the beam to pass...
contexts, a direction or plane passing by a given point is said to be vertical if it contains the local gravity direction at that point. Conversely, a...
high voltages (on the order of 20,000 to 30,000 volts). With only verticaldeflection applied to the internal plates, the face of the tube was observed...
observation of the plumb line (astronomical latitude and longitude) and verticaldeflections. A zenith camera combines an optical lens (about 10–20 cm aperture)...
about 0.01°. Astronomical transit Latitude/longitude observation, verticaldeflection Positional astronomy, astro-geodesy Brinker, Russell C. (1987), "Surveying...
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