Post Processed Kinematic (PPK) is a GPS correction technique used in surveying that collects, uploads, and then modifies location data. The data is corrected after it is gathered and uploaded.
Real-time kinematics (RTK) is another type of correction technique, such as PPK, that performs real-time data and image correction. PPK technology is commonly used for drone mapping and land surveying.
PPK and RTK GPS calibration technology are effective in collecting accurate location information. This is considered an improvement over the traditional method of collecting this information, the use of ground control points (GCPs). A GCP is a place or feature with known coordinates that is used as a landmark for survey purposes.
The PPK method is an alternative to traditional methods such as Ground Control Point (GCP) to efficiently collect accurate location information.
How it Works
PPK surveys require at least two Global Navigation Satellite System (GNSS) receivers to achieve centimeter-level accuracy. One device is a static, reference receiver called the “base” and the other is a mobile receiver called the “rover”. You can use one or more listeners for this survey.
During the workflow, base stations and mobile devices record raw GNSS data. This raw data includes all observations without calculations. There is no need for a reliable connection between the rover and the base station.
The collected data is retained by the survey controller or receiver until the fieldwork is completed. This data is later processed by the software and corrections are applied to the data.
The new drone mapping technology uses a PPK-enabled drone that acts as a PPK receiver. The drone uses PPK to capture numerous geotagged terrain shots in multiple passes.
So which technology is best: PPK or RTK?
Our innate tendency to want something faster, real-time, and real-time can lead us straight to RTK technology, but of course, RTK isn’t always superior to PPK. In fact, the opposite is often the case.
Although both techniques are very similar, the best technique for a particular project will depend to a large extent on the nature of the task at hand.