Centimeter-Accurate Mapping: The Makeflyeasy 8T PPK System
Survey-grade mapping needs survey-grade positioning, and a standard GPS fix — accurate to a few meters — is not it. When a mapping flight produces a point cloud or orthomosaic, every centimeter of positioning error flows straight into the deliverable. The fix is post-processed kinematic (PPK) positioning, which corrects the aircraft’s trajectory after the flight and turns a consumer-grade GNSS track into centimeter-accurate ground control.
Here is how PPK works, why it beats relying on a real-time RTK link alone, and the system we stock for exactly this workflow.
PPK corrects the trajectory after the flight
In PPK, the drone records raw GNSS observations during the flight while a base station (or a network reference) records the same signals from a known point. After landing, software reconciles the two data sets to compute the aircraft’s exact position at every instant. Because the correction happens after the fact, there is no dependence on a live radio link holding up over the whole mission — a dropped RTK correction mid-flight does not ruin the data.
The Makeflyeasy 8T PPK system is built for this: it logs the raw data needed for post-processing and pairs with the survey tools that turn it into a corrected trajectory. For mapping teams, that means a flight flown at the edge of radio range still produces survey-grade results, because the accuracy lives in the logged data, not in the live link.
Why PPK beats RTK-only for field work
RTK gives real-time accuracy but depends on a continuous correction stream from a base or NTRIP network. In rural or obstructed areas, that stream can drop, and every drop shows up as a gap or a degraded section in the map. PPK removes that failure mode entirely: record everything, correct later. Many serious mapping operations run both — RTK for live precision and PPK logging as the safety net — but for the deliverable itself, the PPK-corrected trajectory is what gets submitted.
Combining PPK with a survey-tuned flight controller matters too. The positioning is only as useful as the navigation that uses it, so the GNSS module and the flight controller should be spec’d together to log clean, synchronized data.
What to check in a PPK setup
- Raw GNSS logging rate and storage — enough data for post-processing.
- Base station compatibility, or access to a network reference for your region.
- Antenna quality and placement for clean signal under vibration.
- Workflow compatibility with your photogrammetry or LiDAR software.
- Whether the system logs continuously, so no section of the flight is lost.
Centimeter accuracy is a workflow, not a single component. A PPK system that logs clean raw data and integrates with your mapping software is what closes the gap between a consumer GPS fix and a deliverable a client will accept.
See the Makeflyeasy 8T PPK system and our full high-precision GNSS range.