Digital Theodolite
• Provides the value of observation directly in viewing panel.
• All the parameters required to be observed during surveying can be obtained.
• The value of observation gets displayed in a viewing panel.
• The precision of this type of instrument varies in the order of 0.1" to 10".
The important features of total station are:
◦ Key-board:
Control all the functions are controlled by operating key board.
◦ Digital panel:
Displays the values of distance, angle, height and the co-ordinates of the observed point, where the reflector (target) is kept.
◦ Remote height object:
The heights of some inaccessible objects such as towers can be read directly. The micro-processor provided in the instrument applies the correction for earth’s curvature and mean refraction, automatically.
◦ Traversing program:
The co-ordinates of the reflector and the angle or bearing on the reflector can be stored and can be recalled for next set up of instrument.
◦ Setting out for distance, direction and height :
Whenever a particular direction and horizontal distance is to be entered for the purpose of locating the point on the ground using a target, then the instrument displays the angle through which the theodolite has to be turned and the distance by which the reflector should move.
Comparision of theodolite and Total Station
Both the total station and theodolite are devices for the measurement of vertical and horizontal angles during engineering projects and surveying.
The factors of time, expertise available, and cost will determine the use of either of these instruments.
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