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Terms
  • theodolite A precise telescope set on a pair of rotation axes, the horizontal and vertical axes equipped with two divided circles. One circle measures horizontal angles and the other measures vertical angles. Angles of less than one second may be measured.
  • surveying instruments Instruments used for measuring angles and occasionally lengths on the ground. The principal surveying instruments are the level, the stadia telescope, the transit and the theodolite. Laser rangefinders also are used.
  • laser rangefinder (LRF) An electro-optical instrument used to measure the distance to a target by determining the time required for a pulse of laser energy to travel to the target, reflect from it and return. Typically a telescope is used to improve efficiency in...
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