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Which type of survey done by theodolite?
Chain Surveying
Compass Surveying
Plantable Surveying
All of the above
All of the above
A theodolite is a versatile surveying instrument used for precise measurement of horizontal and vertical angles ┬╖ It is capable of performing various survey operations including traversing, triangulation, and height determination, making it a foundational tool for complex civil engineering surveys.
A theodolite is a versatile surveying instrument used for precise measurement of horizontal and vertical angles ┬╖ It is capable of performing various survey operations including traversing, triangulation, and height determination, making it a foundational tool for complex civil engineering surveys.
H=Dtan(╬▒) тАФ calculation of vertical height using vertical angle ╬▒ and horizontal distance D
D=SтЛЕK+C тАФ distance measurement using the stadia principle in theodolite surveying
The theodolite works on the principle of optical sighting and precise angular measurement via graduated circles ┬╖ The horizontal angle is measured using the horizontal circle (lower plate and upper plate), while the vertical angle is measured using the vertical circle, which rotates with the telescope axis ┬╖ Together, these allow for the calculation of coordinates and relative elevations in any survey method.
Theodolites can be used for transit surveying, where angles are measured by turning the telescope 180 degrees.
Theodolite surveying is superior to compass surveying in accuracy as it is not affected by local attraction.
Electronic Theodolites (Total Stations) integrate distance measurement (EDM) with angular measurement.
Higher precision in measuring horizontal and vertical angles.
Versatility in diverse terrains and project types.
Requires skilled personnel for accurate operation.
Sensitive to environmental factors like temperature and wind vibration.
Laying out curves and alignments for highways and railways.
Topographic mapping and triangulation networks.
The term 'Plantable' in Option C is a common misinterpretation of 'Plane Table Surveying'.
In practice, a theodolite is an instrument, not a survey method itself; however, it is the primary instrument used to execute chain, compass, and plane table configurations when high accuracy is required.
D is correct тАФ The theodolite is a universal surveying instrument that is used to perform or enhance operations associated with chain, compass, and plane table surveying by providing high-precision angular measurements.
Always remember that the accuracy of a theodolite is primarily determined by its least count; standard vernier theodolites usually have a least count of 20 seconds.