Infrastructure Settlement and Deformation Monitoring
We provide settlement and deformation monitoring for infrastructure with satellite InSAR: railways, highways, pipelines, bridges, tunnels, dams, levees, and the urban ground that supports them. Our work helps owners and engineers find where an asset is moving, how fast, and since when, without closing a lane or requiring access to the structure.
Where InSAR Adds Value
| Asset | What InSAR detects |
|---|---|
| Railway and highway embankments | Settlement, heave, and slope creep along the corridor |
| Bridges and viaducts | Approach embankment settlement and abutment movement |
| Tunnels and metro lines | Surface settlement troughs above tunneling and excavation |
| Pipelines | Ground movement across slopes, permafrost, and subsiding land |
| Dams, levees, and dykes | Crest settlement and downstream ground movement |
| Urban ground and buildings | Differential settlement over soft soils and from dewatering |
Transportation Corridors: Railways and Highways
Railway and highway corridors cross soft ground, cut slopes, old fills, and mining areas, and any of these can settle or creep over years. Inspections find damage after it appears; satellite InSAR finds the movement while it is still small. We map the whole corridor at once, flag the sections that are moving, and return a displacement history for each of them, so maintenance can be planned where it is needed rather than on a fixed schedule. The multi-year archive shows whether a section has always moved slowly or has recently accelerated, a distinction that matters when repairs are prioritized. Embankments, bridge approaches, retaining walls, and the slopes above cuttings can all be included in the same analysis, with measurements obtained where radar visibility and surface conditions permit.
Tunneling, Excavation, and Urban Settlement
Tunneling, deep excavation, and groundwater lowering all cause the ground surface to settle, and the settlement can reach buildings and utilities far beyond the site boundary. Satellite InSAR measures the settlement trough over the entire affected area, across buildings and streets where radar reflectivity allows, with no instruments installed. Before construction it provides an independent baseline of how the ground was already moving. During works it shows how observed settlement compares with the predicted envelope. After completion it shows whether measurable movement has continued or stabilized. The same measurements help resolve disputes about whether damage predates the works, because the archive records ground movement from years before the first excavation.
Pipelines, Dams, and Levees
Pipelines cross landslide-prone slopes, subsiding land, and thawing permafrost, where ground movement bends and stresses the line. Dams, levees, and dykes settle under their own weight and can develop localized movement that precedes a defect. In both cases the assets are long, remote, and impractical to instrument throughout. Satellite InSAR screens the whole length, identifies the sections where the ground is moving, and keeps them under observation, so that ground crews and instruments are directed to the places that need them. Where an unstable slope is the concern, our landslide monitoring service applies.
What an Infrastructure Monitoring Program Delivers
An infrastructure program delivers a velocity map along the full corridor or around the full site; a displacement time series for every measurement point, so movement can be read at an individual embankment, pier, or building; vertical and east-west components where suitable viewing geometries and assumptions allow; a ranked list of moving sections; and an interpretive report written for asset managers, structural and geotechnical engineers, and regulators. We select the radar band to fit the asset: C-band from Sentinel-1 for corridor-scale coverage at frequent revisit, X-band from TerraSAR-X or COSMO-SkyMed for individual structures in dense urban areas, and L-band from ALOS-2 where vegetation along the corridor would otherwise degrade the signal. Results are provided as GIS layers and refreshed as new acquisitions arrive.
Why Satellite InSAR for Infrastructure
Satellite InSAR provides wide-area measurement coverage of the asset and its surroundings from orbit, needs no access, closures, or installed equipment, and draws on a multi-year archive that shows how the asset moved before anyone was watching. Built structures and paved surfaces are usually strong radar reflectors, so measurement density is often highest exactly where infrastructure is. Our small-baseline processing can improve coverage over the vegetated ground between structures, and every rate is reported with its own error estimate. Our methods are grounded in peer-reviewed research published in international remote-sensing journals. GNSS integration, independent validation, and second-opinion reviews are available. Infrastructure monitoring complements our land subsidence and oil and gas services and is one of our monitoring services.
Frequently Asked Questions
Can InSAR monitor a single bridge or building?
Yes, where the structure and surrounding surfaces provide suitable radar reflectivity and the acquisition geometry is appropriate. Higher-resolution radar imagery can provide measurements on individual structural elements in suitable conditions, while C-band imagery can provide broader corridor coverage. Movement is measured along the satellite line of sight and, where suitable ascending and descending viewing geometries and assumptions allow, can be decomposed into vertical and east-west components.
How long a corridor can one program cover?
There is no fixed length limit. A single Sentinel-1 Interferometric Wide Swath (IW) acquisition covers a strip about 250 km wide, and adjacent acquisitions along the orbit and neighboring tracks are combined, so a whole railway line or pipeline, hundreds of kilometers long, can be monitored in one program.
Do you need to install anything on site?
No. All measurements come from satellite radar. GNSS stations, if already present, can be integrated to tie the results to an absolute reference.
Can you show how the ground moved before a project started?
Yes. The satellite archive reaches back several years, so we reconstruct the pre-construction baseline from data that already exist.
Is InSAR suitable for sudden events such as a washout or collapse?
InSAR is primarily suited to measuring persistent or developing ground deformation over repeated satellite acquisitions and can help document deformation associated with an event after suitable imagery is available. For real-time warning at a known critical section, on-site instruments remain necessary; InSAR can complement those systems and help identify areas where instrumentation may be warranted.
Discuss your project: Send us the location or coordinates of your site and tell us what you need to understand. We can review the available satellite data, determine how far the archive extends, and discuss what an InSAR monitoring program could provide. Contact us.