Tachometry is a term derived from the Greek words "tachos" meaning speed and "metron" meaning measurement. It refers to a method or technique employed to determine or calculate distances, elevations, or angles using surveying instruments. Tachometry is commonly used in land surveying and civil engineering projects.
In tachometry, a theodolite or total station equipped with additional accessories such as stadia hairs or tacheometric attachments is utilized. These instruments enable the surveyor to measure slopes, distances, and heights by observing and analyzing target points located at different positions.
The process of tachometry involves sighting the target through the instrument and recording the angular readings on both horizontal and vertical circles. Simultaneously, the tachymeter or stadia scale, located within the instrument, is used to determine the distance to the target. By combining the angular measurements and distance calculations, tachometry allows for the determination of various parameters such as height differences, horizontal distances, and vertical angles.
Tachometry is especially useful in situations where direct measurements are impractical or impossible, such as in hilly terrains or densely built-up areas. It facilitates efficient and accurate data collection, aiding in the planning and execution of construction projects, land surveys, or topographic mapping.
Overall, tachometry plays a vital role in modern surveying and engineering practices, enabling professionals to obtain vital measurements with speed, precision, and reliability.
