theodolite
See Also: alidade
[surveying] A surveying instrument for measuring vertical and horizontal angles, consisting of an alidade, a telescope, and graduated circles mounted vertically and horizontally.
A gyrotheodolite is used when the north-south reference bearing of the meridian is required in the absence of astronomical star sights. This mainly occurs in the underground mining industry and in tunnel engineering.
Theodolite surveys- Angles and distances are measured, and positions are calculated like the example in the previous section.
OPTICAL THEODOLITES
5-3. It is difficult to precisely set the angle values on the plates of an optical theodolite.
The theodolite was used to calculate the difference in height between the bottom of the trees observed in the field and the observations to ground level of the open location.
The theodolite is used to measure horizontal and vertical angles to target points. These angles are referred to the local vertical.
Figure 10: Theodolite Schematic
(Click on the diagram to link to the source file)
Figure 11: A Theodolite
Trilateration ...
thematic map See: map, thematic theodolite Precision surveying instrument for measuring horizontal and vertical angles. tide Periodic rise and fall of the water resulting from gravitational interactions between the Sun, Moon, and Earth.
On land, for more than a century they have used theodolites (transits), which are instruments for measuring angles consisting of a telescope that freely rotates 360° horizontally and pivots from 0° to 90° vertically.
Other positioning sensors, useful in GPS-denied testing, include ground-based theodolites and radars. These devices are installed at surveyed locations on the test range and are used to track the test aircraft.
In the 17th century there is the development of surveying equipment and triangulation methods, including the logarithms, theodolite, pendulum clock, and barometric level.
Primary Survey. EDM, theodolite, etc., measurements. These data are typically irregular in their ground coverage and are thus ideal for TIN data structures ...
People have used magnetic compass, sextant, theodolite and measured the positions of sun, moon and stars to find out his own position.
 See also: Survey, Surveying, Location, Information, Coordinate
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