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...Tacheometric surveying tacheometry or tachemetry telemetry is a branch of angular in which the horizontal and vertical distances points are obtained by optical means as opposed to ordinary slower process measurements tape chain method very rapid convenient it best adapted obstacles such steep broken ground deep revines stretches water swamp so on make chaining difficult impossible primary object preparation contoured maps plans requiring both well control also surveys higher accuracy provides check measured with from greek quick measure system positions earth surface relatively one another determined without using separate leveling instrument uses methods used advantage over direct measurement differences elevations some topographic require survey work terrain where inconvenient detail filling reconnaissance for highways railways etc checking already hydrographic establishing secondary instruments an transit theodolite fitted stadia diaphragm generally essentially consists hair above o...