I would suggest to look at new project DJI PANTOM 4 RTK/PPK
DJI PHANTOM 4 PRO RTK-PPK
Survey grade GNSS GPS/QZSS L1, GLONASS G1, BeiDou B1, Galileo E1, SBAS receiver built in standard DJI Phantom 4PRO body and integrated with 20 MP camera. It allows to record photos locations with centimeter...