Real-Time Kinematic (RTK) technology improves GPS accuracy by using a method of differential measurements. In common survey practice, a minimum of four GCPs needs to be established – one for each of the four corners of the survey area. Using this information, GCPs act as “anchor” points in the aerial map, or references by which all points in the map are measured from to reduce the overall error. The locations of these GCPs in the same geodetic reference system are determined using much more accurate methods. Mapping professionals reduce this error within the range of 1 to 3 meters by establishing ground control points (GCPs), pre-determined points on the ground, which will be captured in the aerial photos for the map. Any signal dropouts or drifting of the drone due to the wind can cause errors in GPS location reading, which could get as high as 5 to 10 meters. The thing about GPS technology is that it’s far from perfect. By using the data derived from the drone’s inertial measurement unit (IMU) and gimbal, the mapping software can determine how the tilt of the drone and the camera angle affects the location of every single pixel in each photo. In the case of photogrammetry, the GPS location of the drone allows each photo the camera takes to be “geotagged.” This means that each photo becomes associated with a geographical area based on the drone’s GPS location. ![]() Using a triangulation process, the location of the drone can then be accurately determined using a standard geodetic reference system. An onboard GPS module receives signals from GPS satellite on the Earth’s orbit. Just about any drone equipped with a GPS module and a camera (or other sensors) can be used for drone mapping. What is it, and what are its benefits? What drones available today can do RTK surveys? A background on drone mapping without RTK In this article, we take a detailed look at RTK technology. ![]() The same can also be said for RTK or PPK-based surveys, which are much more technical and require more equipment than a GPS survey. ![]() Doing LiDAR surveys requires more specialized knowledge compare to photogrammetry. Even when using a basic photogrammetry technique, drone mapping has a high technical barrier to entry.Įven within drone mapping, there are several tiers of technical expertise. The thing about drone mapping is that not just every drone pilot can do it. 3D Insider is ad supported and earns money from clicks, commissions from sales, and other ways.ĭrone mapping is considered one of the up-and-coming markets for drone technology, especially as industrial firms and real estate companies start to recognize the cost, speed, and benefits of using drones.
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