The use of LiDAR (Light Detection and Ranging) in modern surveying allows engineers to
- AMeasure the chemical composition of the soil from a distance.
- BReplace the need for any structural analysis software.
- CPredict the exact date of the next earthquake.
- DCreate highly accurate 3D point clouds of existing structures or terrain using laser pulses.Correct
Solution
Concept
LiDAR Technology in Surveying
Formula
N/A
Step-by-step solution
1. Recall the primary application of LiDAR (Light Detection and Ranging) in surveying. 2. Note that LiDAR uses laser pulses to measure distances and generate high-precision 3D point clouds of terrain and structures. 3. Select Option (d) as the correct answer.
Explanation
LiDAR uses rapid laser pulses to measure distances to the ground or structures, creating detailed and highly accurate 3D spatial models known as point clouds. This allows engineers to map terrain and existing features with high precision, making option D the correct answer.
Shortcut
To remember the primary function of LiDAR, use the phrase "LiDAR = Laser to Point Cloud": - Light / Laser: LiDAR uses rapid laser pulses to measure distances. - Point Cloud: These laser measurements create dense, highly accurate 3D point clouds of terrain and structures.
Common mistake
A common mistake is selecting Option A by confusing LiDAR with hyperspectral or multispectral remote sensing, which is used to analyze soil composition. LiDAR uses laser pulses specifically for physical distance measurements and creating 3D spatial models (point clouds), not chemical analysis.
Correct answer: D) Create highly accurate 3D point clouds of existing structures or terrain using laser pulses.