What is PPK?
PPK stands for Post-processing Kinematic and its typical workflow is as follows: During the flight, the UAV will geotag coordinates to each image based on its on-board GPS unit. At the same time, a base (a GNSS base station, an aero control point, or CORS network) is also recording highly accurate positional information. After the flight is over, these two sets of GNSS data are matched up using the photo timestamp. Then the initial, less-than-accurate onboard GPS data is corrected, hence giving the most precise geotags for the imagery. Since it is a post-processing software, this solution does not require real-time connection to the base. The data can be collected without any losses due to communication issues or low signal range, thus making it more reliable than a real-time RTK solution.