0 an instrument that you use for measuring the distance of an object when you are shooting at it or taking a photograph of it
Fore this work's goals, distance information (a laser rangefinder) and odometry information in fully unknown environments are known.
Vertical distance was measured with the rangefinder whenever necessary.
In practical applications, the required obstacle shape and dimensions can be detected by proximity or distance sensors such as ultrasound or laser rangefinder.
Computer vision, laser rangefinders and ultrasonic sensors are common forms of robotic sensing for both terrestrial and underwater environments.
Rangefinders were inaccurate and gunsights were so badly made that they were inefficient.
The other was fitted in the spotting top above the tripod foremast and equipped with a 15ft 1 rangefinder.
In the latter case the rangefinder module is integrated with on-board thermal, night vision and daytime observation equipment.
Measurements using a laser rangefinder if made at a steep angle greater need to be corrected for true horizontal distance using the formula above.
