Free GPR Datasets for Underground Utility Detection

GPR for underground utility detection

GPR detects both conductive utilities (metal pipes, cables) and non-conductive utilities (PVC, concrete, clay) via reflections at material interfaces. Its advantage over locators lies in detecting non-metallic pipes and characterizing depth. It complements electromagnetic locators, providing a full picture of the subsurface for damage prevention and mapping campaigns.

Metallic pipe and cable detection

Metal utilities produce strong, easily identifiable hyperbolic signatures on radargrams. Modern GPR software automatically picks these hyperbolas to measure cover depth, spacing, and orientation. This information supports damage prevention protocols and helps map complex utility corridors before infrastructure work.

Non-metallic utility detection

PVC water pipes, concrete drainage lines, and clay conduits produce weaker but still distinctive reflections. Detection depends on the dielectric contrast with surrounding soil — a dry soil around a water-filled PVC pipe gives strong contrast, while saturated soil may attenuate the signal significantly. Multi-frequency surveys often help resolve difficult cases.

Depth and mapping accuracy

GPR depth accuracy is typically ±10% with proper velocity calibration through known-depth targets. Horizontal positioning accuracy reaches centimeter-level precision with cart-mounted systems using odometers or GPS. This makes GPR suitable for documented as-built utility maps required by regulatory frameworks.

GPR frequencies for utility detection

Medium frequencies from 200 to 400 MHz are the most suitable for typical utility depths of 2 to 5 meters. Higher frequencies (600-900 MHz) improve resolution for shallow utilities and dense corridors. Lower frequencies (100 MHz) may be used for very deep infrastructure but sacrifice resolution.

What these datasets let you practise

Interpretation is also knowing what to discard. One dataset shows several buried utilities alongside a pronounced airwave: part of the emitted energy travels through air, reflects off a surface object and returns as a credible-looking hyperbola. Its velocity gives it away — the curve is wider and flatter than a true subsurface reflection at the same apparent depth. Mistaking one for the other puts phantom utilities on a plan.

Other datasets cover the full workflow of a survey campaign: thirty profiles georeferenced with RTK GPS, positioning files included, so detections can be plotted, exported to a GIS and compared with record drawings. A case of utilities absent from the drawings, crossing the line of a planned trench, shows what pre-excavation detection is for. Polyethylene gas service connections and a stepped-frequency acquisition, fine enough for small-diameter services, complete the set.

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Download raw utility GPR data

All datasets are raw .DZT files with no processing overlay. This makes them ideal for utility interpretation training, ML model development for automated utility classification, or software validation. Free download, immediate access, no account creation required.