PPK processing captures more data, faster
On smaller project sites, it's possible and reasonable to use Ground Control Points (GCPs), which offer survey-quality accuracy. These points are strategically placed throughout the site to georeference the drone-based site model accurately. On large projects, using only this method is impractical because placing and maintaining the GCPs on a regular basis is time consuming.
On large or very remote sites where GCPs are not possible, Post-Processed Kinematic (PPK) is the preferred method of capturing data. Without getting overly technical, PPK allows for receiving accurate locations of each picture captured by the drone in the air during the flight. This results in not needing GCPs to georeference the ultimate site model. The processing time is longer due to the increased area to be captured and the corresponding increased number of images. While PPK drones themselves and the additional processing costs are more expensive, this method is highly accurate on large projects and pays off when the scans are performed on a regular (weekly) basis.