UPSC

LiDAR, which stands for Light Detection and Ranging, is a remote sensing technology that uses laser light to measure distances and create highly detailed, three-dimensional maps of surfaces. Here’s a breakdown of how it works and its applications:

How LiDAR Works

1. Emission of Laser Pulses: A LiDAR system emits thousands of laser pulses per second toward a target area.
2. Measuring Distance: When these pulses hit an object (e.g., the ground, buildings, trees), they reflect back to the LiDAR sensor.
3. Time of Flight: By measuring the time taken for each pulse to return, the system calculates the distance between the sensor and the object. This is known as the “time of flight” method.
4. Data Processing: Each distance measurement (together with GPS location and orientation) is used to create a “point cloud,” which represents the 3D structure of the surveyed area.

Types of LiDAR

1. Airborne LiDAR: Mounted on airplanes or drones, it maps large terrains, including forests, coastlines, and urban areas.
2. Terrestrial LiDAR: Used on the ground, this type can be mounted on vehicles or tripods for detailed surveys of buildings, roads, and other infrastructure.

Applications of LiDAR

• Mapping and Topography: Widely used in creating detailed topographical maps for environmental studies, city planning, and civil engineering.
• Forestry: Assesses forest canopy structure, tree height, and biomass, useful in forest management.
• Autonomous Vehicles: Provides real-time, high-precision 3D mapping of surroundings for self-driving cars to detect obstacles and navigate safely.
• Archaeology: Detects hidden ruins or ancient settlements beneath dense vegetation.
• Coastal and Floodplain Mapping: Helps in analyzing coastal erosion, flood risks, and modeling water flow in flood-prone areas.

LiDAR is valued for its precision, versatility, and ability to work effectively in various lighting conditions, even at night.