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In surveying, the height of instrument (HI) is the vertical distance measured from a reference level to the horizontal axis of the instrument when it is set up for observation. It is a critical value used in computing distances and elevations from observations. HI is typically determined using a spiRead more
In surveying, the height of instrument (HI) is the vertical distance measured from a reference level to the horizontal axis of the instrument when it is set up for observation. It is a critical value used in computing distances and elevations from observations. HI is typically determined using a spirit level or a laser. HI is usually expressed in meters or feet.
See lessFor any set up of level, the height of instrument is the elevation of plane of sight (line of sight) with respect to the assumed datum (Or reduce level of plane of collimation). It does not mean the height of the telescope above the ground where the level stands.
For any set up of level, the height of instrument is the elevation of plane of sight (line of sight) with respect to the assumed datum (Or reduce level of plane of collimation). It does not mean the height of the telescope above the ground where the level stands.
See less