Drones have become increasingly relevant in modern technology and their capabilities are certainly amazing to marvel at. Among these capabilities is the ability to capture data through LiDAR (Light Detection and Ranging) or photogrammetry. As these are two different sensing systems, it is worth taking a closer look at their respective strengths and weaknesses.
LiDAR
LiDAR is an active remote sensing system that uses laser light pulses to measure distances. When deployed with a drone, LiDAR can be used to scan objects quickly and accurately, with the data collected being transformed into a 3D model. This typically results in highly intricate structures and shapes being identified.
As LiDAR is an active system, the speed of data capture is extremely high and because of this, a larger area can be mapped in a shorter amount of time. Furthermore, it can identify different land surfaces, such as foliage, trees, and buildings, helping researchers to take a closer look at their respective environment.
Photogrammetry
Conversely, photogrammetry is different in the sense that it utilizes a passive sensing system, as it collects light from the sun to map objects. This light is then recorded with a camera mounted on a drone, with the resulting images being stitched together to create a 2D map. As a result, the user is able to view the map from different angles and at different scales.
This method produces results that are as detailed as LiDAR, as it can pick up the same intricate structures and shapes. Furthermore, the results are available almost immediately, meaning that the data can be used right away by those utilizing the collected information. Additionally, photogrammetry can be used to measure distance, slope, and area – allowing users to conduct topographic survey work.
Choosing Between LiDAR and Photogrammetry
When trying to figure out whether LiDAR or photogrammetry should be used to capture information, it is important to consider the application of the data being collected. If the user is looking for quick results with detailed scans, then LiDAR is probably the better option. However, for those looking for time-consuming studies where smaller details are key, photogrammetry may be the preferable option.
FAQ
Question 1: What is LiDAR?
Answer: LiDAR is an active remote sensing system that uses laser light pulses to measure distances. As it is an active system, the speed of data capture is extremely high and because of this, a larger area can be mapped in a shorter amount of time.
Question 2: What is photogrammetry?
Answer: Photogrammetry is a passive sensing system that collects light from the sun to map objects. This light is then recorded with a camera mounted on a drone, with the resulting images being stitched together to create a 2D map. As a result, the user is able to view the map from different angles and at different scales.
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