How is GPR data delivered?

A GPR survey produces several deliverables. Here’s what to expect, in order.

On the day

On-slab markings. Every reflector identified during the survey is marked directly on the slab in chalk or paint. Rebar layout, post-tension cables, conduits, and any anomalies are clearly distinguished by colour or symbol. The contractor has actionable guidance before the surveyor leaves site.

Photographs. The marked-up slab is photographed before departure. The photographs go into the formal report and serve as the auditable record of the markup.

Site debrief. The surveyor walks you through the findings before leaving. Areas of certainty, areas of caution, and any recommendations for additional verification are discussed face-to-face.

Within 5 working days

Written report. A PDF document containing:

• Site, element, and surveyor details.
• Statement of brief.
• Method, including equipment, frequency, and scanning pattern.
• Calibration record from the day.
• Findings, annotated plans, depth-indicative layout, photographs.
• Limitations and assumptions.
• Recommendations.
• Issued by the surveyor who did the work.

CAD file. A DXF or DWG with the detected reflectors shown and depths annotated. It comes on a local grid set out on site. If you need it on your project coordinates, send us your grid or control points at the brief and we tie it in.

Calibration record. The calibration of the equipment used on the day.

Reporting timescales

• Standard. Written report and CAD plan within 5 working days.
• Same-day. Available with notice, sometimes for an additional charge.
• Multi-day. For larger jobs, integrated multi-method campaigns, or PAS 128 deliverables.

The reporting timescale is agreed in the quote.

Formats

• PDF for the report.
• DXF / DWG for the CAD file, on a local grid, or on your project grid if you supply it.
• JPG for the photographs.
• Source data files on request, in formats compatible with downstream analysis tools.

Delivery method

• Email for routine deliverables, with files attached or linked.
• Cloud-based platforms for larger datasets, secure environments, or projects with information-governance requirements.
• Secure transfer for sensitive or restricted projects.

The delivery method is agreed in the quote.

What you should check on receipt

When the deliverable arrives:

• Open the CAD file and check the scan areas match where the work is.
• Read the report end-to-end. Particular attention to limitations and recommendations.
• Check the report names the surveyor and the survey date.
• Save the deliverable to the project record system.

If anything is wrong or unclear, raise it before downstream work depends on it. Reputable surveyors fix issues without argument.

Long-term archive

A GPR deliverable is part of the project’s quality record. Save it in the project’s archival system with appropriate metadata (date, surveyor, scope). It may be relied upon for future works, dispute resolution, or asset-management purposes years later.

For more on what to expect from any scanning survey deliverable, see What deliverables should you expect from a scanning survey.