Tacheometry

The tachymetry (Greek tachýs = fast) is the " quick test " of geodesics. It allows the simultaneous recording of the position and height of many points for technical projects, cadastral surveying or for the production of large-scale plans and maps.

Normal recording position based on the principle of the polar coordinates, that is, with the measurement of directions (horizontal angle ) and the spacer means and the polar recording. The height is determined from trigonometric distance and elevation angle and zenith angle.

When Surveying the measurement of distance and height is accelerated, because a single sighting ( to sight ) satisfies:

• Surveying old methodology: in older theodolite by measuring portions of a bar between the stadia lines ( Reichenbach- threads ) of the crosshair, which when multiplied by 100, the approximate distance arise;
• At Reduktionstachymetern by measuring sections of the bar between the curves is reflected into the telescope and move depending on the zenith angle.

• In modern total stations by electro-optical distance measurement and automatic registration of measured values ​​;
• To combine with total stations with additional options, a tachymeter with other instruments of Geodesy - such as GPS, lasers or other sounding.