Measuring Distance Using a LiDAR Scanner

How do you measure distance using a lidar scanner?

Answer with Step by Step Explanation

• The LiDAR system emits laser pulses towards the target object or surface. These pulses travel through the air until they hit the target.

b. Time of Flight Measurement:

where:

• ccc is the speed of light (approximately 299,792,458299,792,458299,792,458 meters per second),

b. Reflection and Detection:

• The pulse reflects off the target object or surface and returns to the LiDAR sensor. The sensor captures the reflected pulse using a photodetector.

Distance=c×td2\text{Distance} = \frac{c \times t_d}{2}Distance=2c×td​​

• The factor of 2 accounts for the round-trip journey of the laser pulse.

• Factors such as atmospheric conditions (e.g., fog, rain) and the reflectivity of the target surface can affect the accuracy of the measurements. LiDAR systems are often calibrated to account for these factors.

c. Resolution and Accuracy:

• Topographic Mapping: LiDAR is used to create detailed maps of terrain elevations.

• Forestry: Measuring tree heights, canopy structure, and forest density.