![]() ![]() There is probably no commercial application as uniquely destined to be revolutionized by drone technology as aerial mapping. 3D Insider is ad supported and earns money from clicks, commissions from sales, and other ways. You can read more about the pros and cons of these two systems here. RTK is more prone to issues, however, you get accurate positioning data in real-time. So which is better? PPK is more reliable but requires a longer processing time post-flight. In comparison, real-time kinematic systems do this correction in real-time as the drone is flying. Post-processing kinematic systems, as their name suggests, do this correction as part of post-processing. Both methods use a base station that consistently records its position to help correct and improve the accuracy of the drone’s location. PPK and RTK systems are both more recent technological developments and aim to eliminate the need for GCPs. However, placing multiple GCPs out across a mapping area can be time-consuming, and isn’t possible in every scenario (e.g. The more GCPs, the more accurate the geographical positioning of the orthomosaic. ![]() They provide a way to check and correct the georeferenced accuracy of the orthomosaic. GCPs are points on the ground with a known position. GCPs are the traditional method for improving the positional accuracy of drone mapping. To get better accuracy, you need to use GCPs, PPK, or RTK systems. While all drones come with a GNSS (including GPS) receiver, they’re usually only accurate to a few meters. It’s always worth doing a test flight to check you’re getting good quality data before doing any big mapping missions.Īccurately geo-referencing your mapping mission You can read more about how to get the right resolution for your mapping mission here.Įvery time you map somewhere new or map under different conditions, you might need to tweak the methods you use. If you need to distinguish small features you will need to fly lower, or use a higher resolution camera. The higher you fly, the larger the area you can map in one flight, but the lower your image resolution. Less overlap and sidelap will mean you can map a larger area in one flight, but you’re more likely to have issues in post-processing.įlight altitude will impact how much area you can map in one flight, and the resolution of the final orthomosaic. If the area that you’re mapping has many distinctive features, you might be able to reduce overlap and sidelap. That being said, to get the best output from your drone mapping, it’s good to be flexible. Overlap is measured between sequential photos, while sidelap refers to sequential flight lines or runs. Outputs from drone mapping can therefore be used to create digital replicas of real areas for analysis.Īs a general rule, we recommend 80% overlap and sidelap. Photogrammetry software can also determine 3D characteristics in an environment. This means that it’s possible to make measurements associated with location, distance, and area. All the objects and features in an orthomosaic are scaled and can be georeferenced. Through a process called photogrammetry, these many images are then turned into a single complete image, called an orthomosaic. Drone mapping allows a level of highly detailed data collection across a large area that isn’t possible through satellite images or traditional ground surveying.ĭrone mapping works by taking many aerial images of an area of interest. ![]() As it’s name suggests, it involves mapping an area of your choice with a drone to produce all kinds of useful outputs like an orthomosaic, digital elevation models and 3D models. So what is drone mapping and how can you use it?ĭrone mapping (sometimes called drone surveying) is a fairly straightforward way to collect data with drones. From real estate, to environmental science to mining, drone mapping has been a game changer and as technology advances, it’s becoming useful in more and more fields. While drones can collect data in many different ways, one of the most widespread methods is drone mapping. Part of what makes drones such a valuable technology is their ability to collect large volumes of data. ![]()
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