Context:

• The Central Pollution Control Board is planning to use advanced LiDAR (Light Detection and Ranging) devices to vertically monitor the air quality of Delhi-NCR.
• The agency is currently focusing on strengthening its surface-level monitoring network, however, in ‘later stages’, vertical monitoring will also be taken up.

About LIDAR:

• LIDAR, which stands for Light Detection and Ranging, is a remote sensing method that uses light in the form of a pulsed laser to measure ranges (variable distances) to the Earth.
• These light pulses—combined with other data recorded by the airborne system— generate precise, three-dimensional information about the shape of the Earth and its surface characteristics.
• Two types of LIDAR are topographic and bathymetric.
• Topographic LIDAR typically uses a near-infrared laser to map the land, while bathymetric lidar uses water-penetrating green light to also measure seafloor and riverbed elevations.
• LIDAR systems allow scientists and mapping professionals to examine both natural and manmade environments with accuracy, precision, and flexibility.
• Scientists are using LIDAR also to produce more accurate shoreline maps, make digital elevation models for use in geographic information systems, to assist in emergency response operations, and in many other applications.

Source:Hindubusinessline