Site reconnaissance & planning
Confirm the survey boundary, review available records, note access constraints and agree the scanning approach.
Subsurface Survey • GPR Mapping • Kenya & East Africa
Ground Penetrating Radar (GPR) Survey
Investigate what lies beneath the surface with non-destructive GPR surveying. Skymap Africa supports construction, infrastructure and site-planning teams with subsurface data to help identify potential buried utilities, underground features and changes in ground conditions.
Discuss Your GPR Survey ↗Non-destructiveSurvey without routine excavation
Subsurface screeningPotential utility and feature mapping
Site-specific workflowScan plan selected for the target
Mapped outputsInterpretation for project teams
Illustrative AI-generated fieldwork visual; not a photograph of a verified project.
Project overview
Understand near-surface conditions before work begins
Ground Penetrating Radar transmits electromagnetic energy into the ground and records reflections from boundaries where electrical properties change. These responses can help survey teams investigate possible buried services, subsurface structures and selected engineering features.
The survey design depends on the project objective, ground conditions, target size and expected depth. Results are interpreted from the recorded data and should be considered alongside existing utility records and other available site information.
- Review available site plans, utility records and access constraints.
- Plan scan lines or a survey grid around the area of interest.
- Acquire and quality-check GPR data with documented survey parameters.
- Interpret potential responses and identify areas that may need further verification.
Survey grid preparation helps organise systematic scanning and traceable field records. AI-generated illustrative image.
Survey methodology
A documented workflow from site reconnaissance to interpretation
Skymap Africa’s GPR survey workflow is tailored to the site and the information required by the project team.
Grid & positioning setup
Mark scan lines or a regular grid and record positioning methods, line identifiers and survey references.
GPR data acquisition
Collect radar traverses with an appropriate antenna frequency, documenting scan direction, spacing and site conditions.
Quality assurance
Review signal continuity, coupling, repeatability and positional records; document relevant processing steps.
Review subsurface responses
Assess radargrams and mapped responses, recording potential features, approximate depth where supportable and confidence.
Prepare survey outputs
Compile an interpretation plan and report, with limitations and recommendations for verification where required.
Project outputs
Clear information for engineering and site teams
Deliverables are agreed to suit the survey scope and the intended use of the data.
⌖
GPR interpretation plan
Annotated site plan showing interpreted responses and survey coverage.
〽
Radar profiles
Selected processed radargrams or profiles supporting the interpretation.
▤
Anomaly register
Feature IDs, locations, depth estimates where justified, confidence and follow-up actions.
◎
Survey positioning
Scan-line or grid layout and coordinate reference information, where captured.
✓
Quality notes
Acquisition parameters, processing notes and relevant quality-control observations.
⇩
Digital files
Agreed digital formats for the client’s reporting and project workflow.
Fieldwork record
Ground-based scanning and survey positioning
Examples of the types of activities involved in a GPR survey.
Figure 1. Illustrative GPR data acquisition with a wheeled radar system.
Figure 2. Illustrative survey grid marking and measurement.
Figure 3. Illustrative positioning and scanning workflow.
Important considerations
Interpretation depends on ground conditions
GPR is an indirect investigation method. Results need to be interpreted carefully and in context.
- Performance can vary with soil conductivity, moisture, clay content, salinity, surface conditions, target size, burial depth and antenna frequency.
- Closely spaced services or complex subsurface conditions may produce overlapping or ambiguous responses.
- Depth estimates are approximate unless supported by suitable site-specific velocity calibration or validation.
- A radar response does not by itself conclusively identify the material, service type or asset owner.
- An area with no clear response must not be treated as proof that buried services or hazards are absent.
- Ground truthing, utility records, electromagnetic locating or trial holes may be needed before excavation.
Frequently asked questions
GPR survey FAQs
What is a Ground Penetrating Radar survey?
GPR is a non-destructive geophysical method that sends electromagnetic energy into the ground and records reflections from subsurface boundaries. The data can help investigate possible buried utilities and other near-surface features.
Can GPR identify every buried utility?
No. Detection depends on ground conditions, target characteristics, equipment configuration and survey design. GPR findings should be treated as interpreted responses, not a guarantee that all buried services have been found.
Can GPR provide exact burial depths?
Depth estimates depend on the ground’s electromagnetic properties and the processing assumptions. They should be reported as approximate unless supported by suitable site-specific calibration or validation.
What information is needed for a quotation?
Share the project location, approximate area or route length, survey objective, available utility/site plans, access conditions and required outputs. Skymap Africa can then discuss a suitable survey approach.
Plan your subsurface survey
Need better information beneath your site?
Contact Skymap Africa to discuss GPR survey requirements for construction, infrastructure, utility investigation or site planning in Kenya and across East Africa.