DJI copters provide a very good solution for 3D reconstruction of various environments (buildings, fields, etc.) and they are appropriate to generate various outputs with Pix4Dmapper: 3D Textured Mesh, DSM, Orthomosaic, etc. A major advantage of DJI copters is the flexibility with the camera tilting and the ability to fly around objects. This is even more suitable for mapping facades for instance.
For an optimal image acquisition plan to achieve the best results with Pix4Dmapper, it is recommended to use the Pix4Dcapture mobile app that allows the drone to autonomously fly and take images (not videos). There are several types of missions available: (Android, iOS) Which type of mission to choose. For more information about the supported DJI drones: (Android, iOS) Which drones are supported by Pix4Dcapture.
To start using the app: Android, iOS (Pix4Dcapture - Getting Started).
For high accuracy results, Ground Control Points (GCPs) should be measured on the field and imported into the project: Using GCPs.
The accuracy of the reconstruction is also affected by the precision of the images, i.e. the pixel size that is called Ground Sampling Distance (GSD). To get the correct GSD, it is needed to set the flight altitude accordingly. For more information: (Android, iOS) What is the GSD when flying DJI drones?.
For more information about the model accuracy: Accuracy of Pix4D outputs.