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Tacheometric method is adopted for contouring of very steep hills.
The steps are as follows:
i) Set up the tacheometer at the top of the steep hill. Tacheometer is a theodolite fitted with stadia diaphragm. The stadia diaphragm has three horizontal parallel hairs instead of one as found in a conventional cross hair diaphragm.
ii) With the help of a tacheometer it is possible to determine the horizontal distance of the point from the telescope as well its vertical level.
iii) The steep hill is surveyed at three levels – the base of the hill, the mid-level of the hill and the top level of the hill.
iv) Using the tacheometer reading are taken all around the hill at equal angular intervals on all these three
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