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The main difference is the method of measuring distances. Tacheometry is optical. A total station uses electromagnetic waves.

Distances measured using Tacheometry are determined by multiplying the difference in readings to a levelling staff between the upper and lower stadia hairs, by a constant (usually 100).

A Total station, by definition, is a theodolite with a built-in EDM measuring device. This sends out a signal of a known wavelength to a reflector and calculates the distance by measuring the time it takes for the signal to return.

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Q: What is the difference between the principle of Tacheometric survey and Totalstation survey?
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