GROUNDCHECK Copernicus EGMS satellite radar · mm/year · free

Is the ground under this address
sinking, or holding still?

The EU's Copernicus programme has measured millimeter-scale ground motion across most of Europe since 2018, using satellite radar. The data is public. Nobody built a tool to read it by address — until now.

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What this number means

Every value comes from repeated Sentinel-1 radar passes over the same ground, compared wavelength by wavelength (InSAR). A negative number means the ground measured at that exact point has moved away from the satellite — typically subsidence — at that many millimeters per year, averaged since 2018. A positive number means uplift. Precision is sub-millimeter per year for a single point; real-world causes include groundwater extraction, mining, peat compaction, permafrost thaw and tectonics.

Limits, stated first. The measured point shown is the nearest EGMS measurement to the address, not the address itself — the distance is shown above, and can be up to a few hundred meters in low-density areas. EGMS only measures land with a stable enough radar signature (bare ground, rooftops, infrastructure); dense vegetation and water have no coverage. This tool reads the same public dataset the official EGMS viewer shows — it does not add error bars beyond what Copernicus itself publishes per point (RMSE). The risk class shown (Low / Moderate / High) is our own banding on the observed velocity range for this dataset — not an official EGMS or geotechnical classification.