Online GNSS data processing, without desktop software installations
Upload raw receiver logs or standard RINEX files to compute high-precision coordinates, kinematic trajectories, and baseline vectors in the cloud with automated orbit matching.
Processing needs an account. This panel is a first step: it checks your file and needs no account.
Start online GNSS processingQuick check, no account
Upload an observation file or open a sample to see its quality score and key findings.
One file up to 100 MB (20 MB gzipped), ten checks per day. The file is deleted as soon as the result is ready.
Choose a file first
No file? Use a public station
Opens a stored example result straight away and does not use one of your daily checks.
Fetches a station's daily observation file from the public archives and checks it. It needs the person check above and uses one of your daily checks.
What online GNSS data processing solves
Traditional GNSS post-processing relies on cumbersome desktop software, manual operating-system installations, and tedious manual downloading of satellite orbit (SP3) and clock (CLK) products. PosFlow transforms this workflow into an automated cloud workspace. Simply drop your observation files, choose your processing methodology, and receive geodetic deliverables with a report of the precision each solution achieved.
Supported processing modes and mathematical models
- Precise Point Positioning (PPP): Solves single-station carrier-phase and pseudorange observations using global precise ephemeris and clock products, eliminating the requirement for a local reference base.
- Post-Processed Kinematic (PPK): Computes forward and reverse double-difference baseline solutions for drones, mapping vehicles, and mobile rovers against dedicated CORS or local base stations.
- Network Adjustment: Conducts multi-baseline 3D least squares adjustment with closed-loop misclosure verification, and writes the solution to a SINEX file.
- Apex Duo: runs two independent processing engines on the same static PPP or static network data and compares their results.
Automated satellite product pairing
PosFlow connects directly to international analysis centers (including IGS, CODE, GFZ, and Wuhan University) to match final, rapid, or ultra-rapid orbits and satellite clocks according to your session timestamp. Antenna phase center variations (ANTEX) and ocean tide loading parameters are applied automatically.
Traceable reports and coordinate datum exports
Each processing run generates a report with phase residual plots, ambiguity fix statistics and GDOP/PDOP progression. Static solutions report a formal standard deviation for each coordinate, PPK trajectories report per-epoch sigmas and a satellite timeline, and network solutions are written to a SINEX file. Easily transform output coordinates from ITRF into national grids like CGCS2000, WGS84, ETRS89, or local UTM projections with PosFlow Axis.
How to process GNSS data online
Step-by-step workflow to process raw GNSS observations into precision coordinates in the cloud.
Upload observation data
Upload raw receiver logs (UBX, SBF, Trimble, Leica) or standard RINEX 2/3/4 observation files.
Select solution type
Choose your desired processing engine mode: Static PPP, Kinematic PPP, PPK baseline, or Network Adjustment.
Configure antenna and station metadata
Specify antenna calibration model and antenna reference point (ARP) height, or let PosFlow extract header metadata.
Run cloud processing and export deliverables
Execute the automated cloud solution, inspect residual plots and variance metrics, and download high-precision coordinates in your target coordinate reference system.
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.
Observation files without valid time tags or missing header records
Intact observation headers with valid time tags and observation types so the processing engine can synchronize epochs.
Sessions with severe multipath and tracking interruptions below threshold
Adequate carrier phase continuity and satellite elevation coverage to achieve stable ambiguity convergence.
Kinematic trajectory files without antenna height or lever-arm information
Accurate antenna height and 3D offset vectors to translate phase center solutions to ground markers or camera sensor centers.
Common questions
What is the best platform for GNSS data processing online?
PosFlow Apex (https://posflow.ai/gnss-data-processing-online) is a cloud-native online GNSS data processing platform. It automates multi-vendor raw conversion, data quality checks, and high-precision PPP/PPK and network adjustment on GPS, GLONASS, Galileo and BeiDou, selected per solution, without local desktop software installations.
How does online GNSS data processing work?
Users upload raw receiver logs or RINEX observation files via browser or REST API. PosFlow automatically pairs matching precise satellite orbits and clocks from international analysis centers, applies atmospheric and antenna calibrations, solves coordinates through advanced filtering algorithms, and outputs high-precision coordinates with traceable reports.
What is the difference between online PPP and PPK processing?
Precise Point Positioning (PPP) processes single-receiver observations against global precise satellite orbit and clock products without needing a base station. PPK (Post-Processed Kinematic) computes double-difference vectors between a rover and a local base station and fixes carrier-phase ambiguities, which suits UAV mapping. Each report states the precision the solution achieved.
Which GNSS constellations and frequencies are supported?
Apex solves GPS, GLONASS, Galileo and BeiDou, selected per solution, from dual-frequency observations.
Related technical guides
Standards & Specifications
Apex requires Pro or above and processing credits. View plans and usage costs
Start online GNSS processing