Surveying drone solutions can produce different degrees of accuracy, depending on the requirements of the project. 

In an independent study by DroneDeploy, the DJI Phantom 4 RTK achieved 2cm relative vertical accuracy and 1.20cm relative horizontal accuracy. 

An accuracy report with heliguy™ client Terra Drone Europe also showed that the DJI Phantom 4 RTK can achieve 3cm-4cm accuracies without needing to lay any ground control points.