LIDAR is a form of remote sensing technology that uses oscillating mirrors to send laser pulses in many directions to generate a “sheet of light” as the drone moves forward. By measuring the time and intensity of the return pulses, you can provide readings of the terrain and points on the ground. With LiDAR, a high-power laser shoots precise pulses at a target and measures the bouncing pulse to collect data about the target. Instead of using conventional cameras, LiDAR sensors send fast laser pulses and capture responses using those data points to plot an area with great precision and accuracy.
Light detection and range (LiDAR) sensors use light energy, emitted by a laser, to scan the ground and measure varying distances. The end result is a comprehensive set of elevation data that can be used to produce high-resolution maps and 3D models of natural and artificial objects. The detection and range of light (LiDAR) is a remote sensing technology that is used to acquire information about objects or phenomena without making physical contact with any of them. LiDAR achieves this objective through lasers, which are devices that emit light waves to measure the distance to a surface or detect objects.
The energy emitted by a LiDAR system is called a “pulse”, while the light reflected from the ground or object is called “return”. Using the speed of light and measuring the time to return to its source, it is possible to accurately measure the distance from the sensor to an object or ground in three dimensions. The fast response times for capturing data and providing high-resolution outputs mean that LiDAR UAVs now offer a cost-effective and viable alternative for terrestrial mapping and topography projects. Applications such as dam and water transport, infrastructure topography, landslide mapping, pipeline inspection and archaeological site topography have benefited from LiDAR for aerial vehicles, which has proven to be a better alternative to hazardous terrestrial topography or aerial LiDAR mapping.
This LiDAR sensor detects targets with a range of up to 215 meters and has a light weight of 75 grams, making it a fantastic and lightweight LiDAR sensor that will work with several drones. The SNCF wanted to compare UAV LiDAR surveys with those carried out with traditional methods, in a real work situation. Because the laser pulses emitted by a LiDAR system are reflected on objects both on and above the ground surface, LiDAR is a very useful technology for penetrating vegetation from the air and seeing the ground below. In the case of the LiDAR UAV, the number of points per square meter is high, since it flies lower and slower, compared to other aerial options, such as the helicopter or the airplane.
The acquisition of LiDAR data from UAVs can be done in a timely, accurate and safe manner, and at a much lower cost than manned aircraft surveys. The best LiDAR drone for building inspection may not be the best for planning irrigation, so it's important to know the intended use case before buying a LiDAR sensor. However, LiDAR technology, which used to cost thousands of dollars, now only costs a couple of hundred and, within a few years, even these LiDAR sensors will start to come down in price. Mapping an archaeological site with a LiDAR UAV is fast and efficient compared to ground-based scanning and mapping methods.
While utility operators may have had difficulty measuring small infrastructure components (including power lines) before the arrival of affordable LiDAR systems for unmanned aerial vehicles, they can now carry out aerial inspections. In addition, higher-strength drones are now available, which will expand the type of applications for which the LiDAR UAV can be used. Next we will discuss different ways in which LiDAR is currently used as well as best LiDAR drone sensors currently on market. However while there are all-in-one drones and full-service LiDAR packages best investment for hobbyists enthusiasts or even smaller companies is high-quality LiDAR sensor.
These advances together with advances in technology used to integrate drones with LiDAR data have led rapid increase in number of companies using drones equipped with LiDAR as comprehensive full-scale 3D mapping system.