using a parallactic triangle with variable angles and a base of fixed length in the observation station, e.g. in the instrument

Full Title

Measuring distances in line of sight; Optical rangefinders (tapes, chains or wheels for measuring length G01B3/00; active triangulation systems, i.e. using the transmission and reflection of electromagnetic waves other than radio waves, G01S17/48) > using a parallactic triangle with variable angles and a base of fixed length in the observation station, e.g. in the instrument

Child Classifications

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• G01C 3/12 with monocular observation at a single point, e.g. coincidence type (G01C3/20 takes precedence)
• G01C 3/14 with binocular observation at a single point, e.g. stereoscopic type (G01C3/20 takes precedence)
• G01C 3/18 with one observation point at each end of the base (G01C3/20 takes precedence)
• G01C 3/20 with adaptation to the measurement of the height of an object