Goseeko blog

What is Tacheometry?

by Team Goseeko

Tacheometry it is a branch of angular surveying in which the horizontal distance from the instrument station to the staff and therefore vertical distance of a point are determined from instrumental observation. Changing is thus completely eliminated. Method is more rapid though less accurate as compared with chaining.

Objects of Tacheometry:

  1. Preparation of contoured maps or plans.
  2. Used in hydrographic surveys.
  3. Location survey for roads, railway, reservoir etc.
  4. One uses it for checking more precise measurements.

Principle of Tacheometry:

The principle of tacheometry is that one can enable to compute horizontal and vertical distance from reading upon a stadia rod and thus eliminate chaining operation.

Tachometer is used under following situation:

  1. When obstacles meets such as steep and broken ground, stretches of water or swamps, One adopts tacheometry as best from the speed and accuracy point.
  2. In rough countries both horizontal and vertical  measurements are tedious and chaining is inaccurate, difficult and slow.
  3. Lastly in locating contours and filling in details in a topographic survey this method is usually the quickest and best.

Essential requirements of tacheometer:

  1. A tacheometer
  2. A levelling or stadia rod

A tacheometer:

  1. Firstly a tacheometer is usually a transit theodolite having a stadia diaphragm
  2. Lastly the telescope of tacheometer may be
  1. External focusing
  2. Internal focusing
  3. External focusing fitted with analytic lens.

Levelling staff or stadia rod:

  1. Firstly the stadia rod or staff rod used with the thermometer may be usual types of levelling staff having least count of 0.005 m 
  2. Stadia rod usually in one piece but for ease of transport it may be folding or telescope.

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