Monitoring basis
Objectives, measured components, reference conditions, roles and acceptance criteria are written before mobilisation.
For asset owners, designers and contractors, NHAZCA delivers geotechnical monitoring services that combine in-situ, radar and image-based measurements with quality control and an engineering handover.
Geotechnical monitoring services combine system design, controlled acquisition, data validation and reporting to follow ground and ground–structure behaviour. The scope should state what is measured, how often, who interprets it and which decisions remain with the client or responsible authority.
Objectives, measured components, reference conditions, roles and acceptance criteria are written before mobilisation.
Access, acquisition frequency, quality checks, maintenance and interruptions are planned as part of the service.
Agreed maps, time series, exception notes and interpretive updates reach the people responsible for the asset.
ISO 18674-1:2015 sets out general rules for performance monitoring of ground, structures interacting with the ground, geotechnical fills and geotechnical works.
A geotechnical monitoring service is organised as a lifecycle. This gives the client a defined monitoring basis, an operating method and scheduled outputs instead of several instrument feeds to reconcile independently.
Agree objectives, responsibilities, measured components, exclusions and required outputs.
Choose the measurement mix, locations, baselines, cadence and quality controls.
Acquire and validate data, document interruptions and maintain the agreed observation chain.
Issue scheduled deliverables with interpretation, exceptions and limits stated.
A managed service lifecycle from an agreed basis to technical handover.
Method selection follows the monitoring basis, from geotechnical instrumentation in the ground to radar and image-based layers. The provider should explain what each layer measures, where it is valid and how it contributes to the agreed deliverable.
Inclinometers and piezometers answer location-specific questions — displacement at depth and pore water pressure. Extensometers and tiltmeters can complete the in-situ layer. Baselines, survey method and reading schedule must be defined in the operating plan.
Satellite InSAR can add historical and portfolio-scale context where suitable radar targets and viewing geometry are available.
Ground-based InSAR (TInSAR) can provide maps and time series from a fixed site position. The service specification must retain line-of-sight geometry and signal-coherence limits.
PhotoMonitoring™ can support repeated image correlation and change detection. The workflow must distinguish deformation from vegetation, light, registration and site activity. Results are delivered through the IRIS platform.
A comparable proposal for geotechnical monitoring services states the boundary as clearly as the equipment list.
| Procurement question | Evidence expected in the scope | Why it matters |
|---|---|---|
| Which decision must the programme support? | Monitoring basis, stakeholders, responsibilities, exclusions and required outputs | Prevents unrelated data collection and hidden assumptions |
| What component is actually measured? | Technique, geometry, coverage, baseline, resolution and stated limitations | Prevents a partial observation being presented as complete deformation |
| How will the service operate? | Access, acquisition cadence, validation, maintenance and interruption handling | Makes continuity and response times operationally realistic |
| What will the client receive? | Delivery cadence, formats, maps, time series, issue log and interpretive notes | Connects measurement to the client's engineering workflow |
| Who owns thresholds and decisions? | Clear split between measured evidence, reference thresholds and operational response | Avoids transferring authority or liability by implication |
The output package should be defined before mobilisation, including cadence, format, interpretation boundary and the treatment of missing or low-quality data.
The approved objectives, configuration, baseline, roles, cadence and exclusions.
Agreed displacement monitoring time series and deformation maps with coverage and quality information attached.
Technical commentary on observed behaviour, comparisons and items requiring attention.
Interruptions, low-coherence periods, unavailable observations and scope changes.
Teams need baseline evidence and agreed observations before, during and after excavation, tunnelling, loading or other ground-interacting works.
Owners need repeatable deformation monitoring evidence, data-quality notes and scheduled reporting for infrastructure, earthworks and adjacent ground — in coordination with Structural Health Monitoring where the asset itself is instrumented.
A focused programme combines the site model with measurements chosen for the suspected mechanism. For hazard-specific delivery, see landslide monitoring systems.
Wide-area observations can help asset managers identify where detailed investigation or denser instrumentation should be considered.
The agreed scope should distinguish NHAZCA's monitoring delivery from the client's engineering, safety and operational responsibilities. Measurement does not silently assign thresholds, prediction or response authority.
Published NHAZCA case studies provide context for remote-monitoring delivery on slopes and infrastructure; each new programme still requires its own monitoring basis and approval chain.
Authoritative sources for the scope and limitations of the monitoring methods described above.
To scope geotechnical monitoring services, the provider needs the engineering objective, site model and constraints, project phase, access conditions, existing data, required update frequency, intended users and required deliverables. Unknowns should be recorded rather than hidden in the proposal.
A clear scope normally covers system design, baselines, acquisition procedures, validation, maintenance responsibilities, data delivery, interpretation boundaries and exception reporting. The exact package remains project-specific.
Not as a general rule. Satellite and ground-based radar, imagery and point instruments observe different components and spatial scales. They may complement one another, but substitution must be justified against the monitoring objective.
It is agreed from the expected behaviour, project phase, decision timescale, access, instrument capability, data quality and reporting need. Acquisition frequency and reporting frequency may be different.
Monitoring can supply current measurements and agreed technical outputs. Reference thresholds, escalation rules and operational response must be assigned explicitly to the competent client or authority; monitoring is not a deterministic prediction.
Cost follows the scope: objectives, site and access conditions, the measurement mix, acquisition and reporting frequency, duration and deliverables. Without these elements a figure would not be technically meaningful. Share your brief for a scoped estimate.
When comparing geotechnical monitoring services, look at the measured component, coverage, baseline, operating model, quality controls, deliverables, response assumptions and division of responsibilities—not only the instrument list or nominal acquisition rate.
Scope, acquisition, validation and technical handover are designed as one service rather than separate data feeds.
In-situ, radar and image-based methods are selected for measurement fit, not added to enlarge an equipment list.
Geometry, quality, interruptions, assumptions and temporal validity remain visible in the client handover.
Share the engineering objective, site constraints, existing evidence and intended decisions. NHAZCA can help define the measured components, operating model and required handover.