Free GSSI GPR Datasets
Real-world data acquired with GSSI Ground Penetrating Radar systems — FLEX NX, NX25, NX15 and more
Download real-world GSSI Ground Penetrating Radar data acquired with FLEX NX, NX25, NX15 and other GSSI systems. GSSI (Geophysical Survey Systems, Inc.) is the world's leading manufacturer of Ground Penetrating Radar equipment, and its native DZT format is the de facto standard for GPR data exchange.
GPRbase is published by MDS (Le Matériel de Sondage), the exclusive GSSI partner for the French market for 35 years. This long-standing partnership means the datasets you find here were acquired by operators who know GSSI equipment inside out — with correctly configured systems, appropriate antenna selection, and documented acquisition parameters. Every dataset specifies the exact GSSI antenna and frequency used.
Whether you own GSSI equipment and want comparison data, evaluate GSSI systems before purchase, develop DZT-compatible software, or build training material for GSSI operators, these authentic datasets give you real field data from the world's most widely deployed GPR platform. All data is free under Creative Commons BY-NC-SA 4.0.
GSSI datasets
Raw DZT files from GSSI systems — download and explore — 17 datasets available
Confirmed Karst Cavities in Limestone — 300 MHz GPR Profiles to 4 m Depth
Raw GPR profiles acquired over limestone containing confirmed karst cavities, using a GSSI UtilityScan DF dual-frequency antenna. The 300 MH…
Reinforced Concrete Slab with Expansion Joint
GPR dataset containing 7 files collected on a reinforced concrete slab using a GSSI FLEX NX structure-scanning radar. The data clearly show …
Utilities & Interfaces in Favorable Soil with Deep GPR Penetration
GPR dataset containing 1 file collected with a GSSI UtilityScan DF dual-frequency 300/800 MHz ground penetrating radar in highly favorable s…
Ground-penetrating radar detection of gas connections (HDPE polyethylene)
4 dual-frequency ground-penetrating radar profiles (UtilityScan DF) showing the location of HDPE (High-Density Polyethylene) gas connections…
3D concrete scanning over a slab-access ramp interface
60 x 60 cm 3D grid (10 cm spacing). Starting point at bottom left (0,0) and profiles from left to right, then from bottom to top. Try to rec…
Detection of various buried utilities using a dual-frequency antenna (300 MHz and 800 MHz) Highway pavement inspection along an emergency stopping lane (ESL)
One GPR profile across an avenue, crossing several buried utilities. How many do you see?…
Two layers of rebars in a reinforced concrete structure (3D grid)
26 profiles (60 x 60cm grid), 5cm spacing. Ideal dataset for practicing 3D processing with GPRviewer, and easier to see the best possible re…
Roadway inspection along an emergency stopping lane (ESL)
Six dual-frequency ground-penetrating radar (GPR) profiles (300/800 MHz) showing numerous interfaces and pavement structure layers in a soil…
Thickness detection above three masonry bridge arches
Ground-penetrating radar measurements recorded with UtilityScan DF 300/800 MHz from the roadway…
Detection of buried pipes with the NX15 step-frequency ground-penetrating radar antenna
High resolution imaging with the NX15 antenna, for detecting buried cables and pipes. Observe the data quality, ideal for locating small-dia…
Voids in a concrete block wall
FLEX NX file, dual antenna (inline & cross-line), created on a concrete block wall with gaps (no concrete) at the end of the profile. Test t…
3D Grid Concrete bloc wall with voids
3D grid 60x60 cm created with the FLEX NX radar, 3D mode (26 profiles per antenna) Spacing : 5 cm Origin (0,0) : bottom-left…
Georeferenced dual-frequency ground-penetrating radar (GPR RTK) files
16 Radar profiles in a parking lot, showing heterogeneous soil conditions. The data is georeferenced and can be imported into GPRviewer for …
FLEX, NX25 and NX15 reference lines (MDSLab)
Three radar profiles were created on the same line, one of our reference lines in the MDSLab in Aix-en-Provence. Compare the measurements of…
Double layer of reinforcement and structural change (1 profile)
One radargram. Two identifiable steel layers, the second being more difficult to discern. A change in structure is also visible before 50 cm…
FLEX 3D grid 60 x 60 cm (reinforced concrete beam and slab).
INLINE (channel 1) and CROSS-LINE (channel 2) profiles: 26 profiles, 13 in X, 13 in Y (5 cm spacing)…
Detection of a backfilled marl pit beneath a road
This profile shows a measurement taken at the level of a roadway, with the presence of a marl pit that has been filled in. Several layers of…
GSSI: the world reference in GPR
Founded in 1970, GSSI pioneered commercial Ground Penetrating Radar and remains the global market leader. Its systems cover the full application spectrum: concrete inspection, utility detection, geophysics, road assessment, and archaeology. The DZT data format used by all GSSI systems has become the most widely supported GPR format across processing software, open-source libraries, and research tools.
The current concrete range: FLEX NX, NX25, NX15
GSSI's current concrete inspection range delivers high-resolution imaging for structural diagnostics. The FLEX NX (2.5 GHz) offers versatile high-frequency scanning; the NX25 (2.5 GHz) targets detailed shallow inspection of slabs and walls; the NX15 (1.5 GHz) trades some resolution for deeper penetration in thick structures. Several GPRbase datasets were acquired with these antennas — ideal reference material for owners and prospective buyers.
Utility detection and geophysical systems
Beyond concrete, GSSI systems cover utility mapping and subsurface geophysics with antennas from 100 MHz to 900 MHz. Datasets on GPRbase acquired with utility detection systems (including legacy dual-frequency equipment) demonstrate real multi-utility corridors, variable soil conditions, and deep penetration cases — documented with the exact equipment used as factual acquisition metadata.
MDS: exclusive GSSI partner in France for 35 years
MDS (Le Matériel de Sondage) has been the exclusive GSSI distributor for the French market for 35 years — providing equipment, training, and technical support to the French GPR community. GPRbase and the free GPRviewer software are MDS initiatives to open GPR data and tools to everyone: students, researchers, engineers, and operators worldwide.
The DZT format ecosystem
All GSSI systems record data in the DZT format: raw binary radar traces with a documented header containing acquisition parameters. DZT files open in the free GPRviewer, in GSSI's RADAN processing suite, and in open-source libraries (readgssi, GPRPy, RGPR). This mature ecosystem makes GSSI data the most accessible starting point for anyone learning GPR data processing.
Download free GSSI sample data
Every dataset below was acquired with GSSI equipment and contains raw DZT files, free under CC BY-NC-SA 4.0. Use them to benchmark your own acquisitions, evaluate antenna performance across applications, develop and test DZT-compatible software, or train operators on realistic data before field deployment.
Frequently asked questions — GSSI data
Are all GPRbase datasets acquired with GSSI equipment?
The vast majority are, reflecting the GSSI expertise of MDS and its network. Each dataset page documents the exact equipment; the manufacturer is specified in the metadata.
Which GSSI antennas are represented in the datasets?
The collection spans the current concrete range (FLEX NX, NX25, NX15) and other GSSI systems across the frequency spectrum, including legacy utility detection equipment documented as acquisition metadata.
Can I compare my GSSI acquisitions with these datasets?
Yes — that is a key use case. Matching antenna and application, you can benchmark signal quality, penetration depth, and target signatures against documented reference acquisitions.
I am considering buying a GSSI system. Can this data help me evaluate?
Absolutely. Download datasets acquired with the antenna you are considering, open them in the free GPRviewer, and see exactly what the system produces in real conditions. For French market inquiries, MDS (mds-paris.com) provides demonstrations and advice.
Does GSSI endorse GPRbase?
GPRbase is an independent initiative published by MDS, the exclusive GSSI partner for the French market for 35 years. It is not a GSSI corporate service; equipment names are used factually to document the acquisitions.
Acquired data with your GSSI system?
Share your DZT files with the community. Contributions from GSSI operators worldwide make this collection richer for everyone.
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