What is RTK in surveying?

RTK (Real-Time Kinematic) applies corrections from a base station or network in real time so a rover or drone can achieve centimeter-level positioning while moving, as long as integer ambiguity is fixed and multipath is controlled.

PPK (Post-Processed Kinematic) applies the same differential idea after the survey: raw observations are processed against base or network data. It can recover fixes when real-time links drop, at the cost of office processing time.

Network RTK uses a grid of permanent reference stations and a correction service (often VRS or similar) so you do not need your own base on every job—ideal when you have cellular or radio access to the service.

PPK vs RTK vs Network RTK — GNSS Corrections Explained

RTK (real-time)

Corrections arrive over radio, cellular, or network link while you work. Best when you need immediate stakeout, live QC, or drone flights that require fixed status before shutter. Vulnerable to link loss, baseline length, and sky obstruction.

PPK (post-processed)

Store raw observations; apply corrections in software later. Often rescues epochs when real-time links failed. Adds office time and requires disciplined file management. Common for drone mapping and some mobile campaigns.

Network RTK

Uses a commercial or public CORS-style network (VRS, MAC, etc.) instead of a local base. Reduces setup time—verify subscription coverage, datum, and latency for your accuracy class. See also GNSS & RTK overview.

Mode	Best for	Watch for
RTK + own base	Remote jobs, full control	Baseline limits, setup time
Network RTK	Urban / covered areas with NTRIP	Subscription, multipath
PPK	Drones, dropped links	Processing workflow