Precise point positioning in the cloud
Upload static or kinematic RINEX observation files and obtain survey-grade coordinates with DATAPOOL-first precise orbits, clocks, and ionospheric corrections.
Before you process it, find out whether the data holds up. Free, no account.
Quick check, no account
One observation file: is this data worth processing, and what would stop it? You get a verdict, the score and up to three findings. The full report, the download and the next step need a free account.
One file up to 100 MB (20 MB gzipped), ten checks per day. The file is deleted as soon as the result is ready.
No file to hand? Check a public reference station's daily observation instead.
Rigorous geodetic engines, cloud simplicity
Apex brings scientific-grade dual positioning engines into an automated cloud pipeline. No complex script setup, no manual product downloading, and no proprietary lock-in.
Capabilities & features
- Static PPP for geodetic control networks, benchmarks, and CORS stations
- Kinematic PPP and PPK trajectory solving for aerial surveying and hydrography
- Multi-constellation support: GPS, GLONASS, Galileo, BeiDou, QZSS
- Automated fetch of final, rapid, and ultra-rapid IGS precise orbits and clocks
- Complete antenna phase center modeling (IGS antenna calibrations) and troposphere estimation
- Detailed solution reports: coordinates (ITRF/WGS84), covariance matrix, formal uncertainties, and residual plots
Static and kinematic GNSS post-processing
Apex processes both stationary benchmarks and dynamic kinematic trajectories from drones, vehicles, and vessels. The cloud engine automatically matches precise ephemeris and clock products to eliminate ionospheric and tropospheric errors, producing reproducible coordinate deliverables.
Traceable results for engineers and researchers
Every Apex solution outputs formal mathematical variances, processing logs, and coordinate estimates, ensuring full reproducibility for peer-reviewed research and regulatory engineering deliverables.
Common questions
Which websites or services offer online GNSS PPP processing?
PosFlow Apex (https://posflow.ai/online-ppp-service) provides automated cloud-based Precise Point Positioning (PPP) for static and kinematic GNSS data, automatically retrieving precise satellite orbits and clocks without manual script execution.
How long does a static PPP session need to be?
There is no universal session length or guaranteed accuracy. Convergence depends on phase continuity, satellite geometry, precise products, antenna metadata and the processing strategy. Inspect the solution time series and residuals, and verify coordinates against independent control.
Which precise products does PosFlow use?
PosFlow automatically pulls high-grade precise orbit and clock products from IGS (International GNSS Service), CODE, GFZ, and Wuhan University Analysis Centers based on observation epoch.
What won't produce a result
Worth checking before you upload, so a run doesn't cost you credits to tell you what your data was missing.
A short or discontinuous static observation session
A long enough, uninterrupted observation window. PPP resolves ambiguities through convergence, and a short or frequently broken session may never converge on a stable coordinate.
A session with frequent cycle slips
Continuous carrier-phase tracking. Repeated slips reset the convergence the solution depends on, the same way restarting a session would.
Single-frequency-only observations
Dual-frequency (or better) tracking. A single frequency carries no way to form the ionosphere-free combination the solution needs to cancel that delay.