Posted on: 5 September 2019
Decades ago, aerial imagery acquisition was completed primary by high-flying planes. But these high-flying planes couldn't capture very high resolution scans. Not only did they need to move quickly, but they had to fly high up. Today, drones are a better option.
How Are Drones Used to Capture Aerial Imagery?
Drones are fitted with special sensors and imaging technology. They then fly close to the ground, capturing complete surveys. These surveys can be in the form of aerial photos or laser 3D data. Once the drones land, the data can be analyzed.
Drones can either use a solution called "photogrammetry" or "LiDAR." Photogrammetry takes many pictures and then analyzes them, creating a 3D image out of these 2D photos. The result will be appropriately colored and textured. These images are easily read by people.
LiDAR, on the other hand, just creates a 3D terrain using points of data. The resulting points of data aren't going to have any color or texture, and will be best read by a computer.
Why Are Drones Superior to Other Options?
Before drones, planes and helicopters were the major options. The primary downside to planes and helicopters is that they're manned. A manned aerial craft is not only expensive, but potentially dangerous. Even a minor crash or accident could cause a loss of life.
Comparatively, drones are exceptionally safe. If the drone crashes, only the drone is damaged. Drones are faster, lighter, and cheaper. They are also more mobile. They can fly lower to the ground because they don't need to worry about a crash. This allows for higher resolution scans.
And, of course, scans that are done on foot tend to take a very long time, and can't be done in potentially dangerous locations.
What Can't Drones Be Used For?
The only downside to drones is that they can't cover exceptionally large distances quickly. While drones can be used for the majority of surveys, they aren't very useful for, say, mapping an entire city at once. Planes and helicopters are better for these types of large scale data projects.
Still, for the most part, drones tend to be the best option for aerial imagery. They're versatile, affordable, and safe.
Drone technology is still being developed for aerial imagery, but it's one of the most promising options available today. Many companies have drone, plane, and helicopter imaging, so you can use the type that is best for your project.Share