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Which instrument is precise and speedy in survey?
Theodolite
Plan table
Compass
All of the above
Theodolite
The theodolite is the most precise instrument for surveying as it measures both horizontal and vertical angles with high accuracy, typically down to seconds. Due to its advanced optical systems and mechanical precision, it is the preferred tool for high-order control surveys and setting out complex engineering structures.
The theodolite is the most precise instrument for surveying as it measures both horizontal and vertical angles with high accuracy, typically down to seconds. Due to its advanced optical systems and mechanical precision, it is the preferred tool for high-order control surveys and setting out complex engineering structures.
d=DтЛЕcos2╬╕ тАФ distance measurement component
V=DтЛЕ21тАЛsin(2╬╕) тАФ vertical height component
The theodolite utilizes a telescope mounted on a dual-axis system (horizontal and vertical) with graduated circular plates. Angular measurements are obtained by aligning the line of sight with targets and reading the vernier or micrometer scales, which provide precise readings of the rotation angles.
Theodolites offer the highest degree of angular measurement accuracy compared to compass or plane table surveys.
Used extensively for traverse surveying, triangulation, and setting out curves.
Modern electronic theodolites (Total Stations) integrate distance measurement for extreme speed and efficiency.
High precision for angular measurements
Versatility in measuring both horizontal and vertical angles
Ability to perform sub-tended distance measurement
High cost compared to basic compasses
Requires skilled operator to handle complex adjustments
Susceptible to errors from improper leveling
Construction of high-rise structures
Large-scale triangulation and control surveying
Setting out alignment for highways and railways
| Feature | Theodolite | Compass/Plane Table |
|---|---|---|
Precision | Very High | Low to Moderate |
Plane table surveying is a graphical method and is generally less precise for complex control work.
Compass surveying is primarily for rough reconnaissance and is prone to magnetic interference.
A is correct тАФ The theodolite is the most precise and efficient instrument for angular measurement in standard surveying workflows.
Always remember that while theodolites excel in precision, Total Stations are the industry standard for speed as they combine electronic theodolites with EDM (Electronic Distance Measurement).