Municipalities can use long-term satellite ground movement measurements to make better decisions about roads, sewers and public space maintenance. InSAR shows where settlement is happening, how it differs between streets and whether an intervention should be brought forward or deferred, so inspections and budgets can be focused where they matter. Movement histories become even more valuable when interpreted by specialists and linked to asset age, drainage performance and renewal costs.
Replace area averages with asset-level understanding
A city built on soft or variable soils can settle at different rates on neighboring streets. A single regional estimate cannot describe every road section, sewer stretch or pavement transition. InSAR provides repeated observations across large areas wherever surfaces offer reliable radar targets, helping planners find local differences that deserve a closer look. You can read how one municipality used this in its long-term planning in the City of Diemen case study.
A city-wide analysis should also map areas with poor coverage. Vegetation, resurfacing and other surface changes can interrupt a radar time series, so planners need to know which streets are well observed and which require other evidence.
Link the movement history to maintenance decisions
Start with the existing GIS asset register, planned renewals, condition surveys, flooding complaints and known service problems. Join displacement histories to the relevant streets or assets using explicit spatial and quality rules. The result shows where movement is persistent, where rates have changed and where the consequences of settlement are greatest.
For sewer systems, settlement can affect gradients and drainage performance. However, satellite observations of the road or ground surface are not direct measurements of buried pipe geometry. Use CCTV inspection, leveling, hydraulic data and field assessments when a decision depends on the actual condition of the network.
Prioritize by consequence as well as movement
A fast-subsiding local street and a moderately moving critical access route may need different responses. Build a prioritization method that accounts for safety, service criticality, deterioration, complaints, upcoming works and confidence in the data. Share the assumptions with the engineering team so any risk score can be challenged and refined. You can read more about InSAR for civil engineering and infrastructure on SkyGeo's website.
Avoid presenting every location with rapid settlement as an urgent failure risk. Some movement is long-standing and manageable through scheduled maintenance. What matters is whether it changes the planned intervention.
What the Diemen case shows
SkyGeo's published case with the municipality of Diemen explains how historical satellite displacement data supported a shift from reactive maintenance cycles toward longer-term road and sewer planning. The case reports annual maintenance savings of €200,000, tied to Diemen's specific circumstances and program, and is a documented example of the value the approach can create.
The transferable method is to move from scattered inspection records to a consistent spatial evidence base, then connect that evidence to capital planning and maintenance choices. A successful program records not only where the ground moves, but which decisions changed because the information was available.
What should a first municipal pilot include?
Choose an area with mixed ground conditions, known maintenance needs and usable historical imagery. Agree on a small set of test decisions with asset managers before processing begins. Then evaluate whether the results change inspection priorities or budget timing, and note where additional ground measurements are still needed.
Frequently asked questions
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Not directly. Displacement is one input. Budgets also depend on asset condition, design life, consequences, intervention costs and planning assumptions.
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Not from the map alone. Soil, groundwater, works records and other information are needed alongside the movement data, and a correlation in time is not proof of cause.
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Asset IDs connect observations with ownership, condition records, inspections and investment decisions, which makes the information actionable instead of a standalone map.
Test a municipal maintenance use case
If your municipality is prioritizing renewal on subsiding ground, pick a district and the asset information you already hold, and we can review it together. Contact SkyGeo.
