Surat Basin Ground Deformation

11.2 million 80 m ground-motion measurement points across the Surat Basin gas fields and Southeast Queensland (two Sentinel-1 frames, 2021–2026). Click any point to inspect its full time-series.

Go to coordinates

Ground velocity (mm/yr)

-20 subsiding±5 stable+20 uplift

Basemap

Deformation surface 10%

Uplift sensitivity & filter decay ≥ 25

Uplift in an extraction basin is largely a moisture artifact, not real ground rise — so the moisture-biased blue is suppressed by default. Transparent, not hidden: slide to 0 for the raw, unfiltered response (all uplift shown). Higher removes uplift co-located with more decay (moisture); the centre default trims uplift where decay ≥ 25.

Motion filter

Trend class

Classes from the uniform CONN=2 re-inversion (Jul 2026), computed on datum-tied series. An Onset class (dating when motion began) is in validation and will appear here.

Reliability Masks

Trust filter Medium (default)

Frac reliability off

TempCoh reliability off

Frac — the fraction of the interferogram stack where this pixel unwrapped into the main connected component. High = the phase resolved consistently across the five years; low flags where unwrapping likely failed. It varies frame to frame (~4%; the Track 147 frame is noisier), so the default threshold is set per-frame — 98.3% on Track 45, 96.7% on Track 147 — and both reach 100% together as you slide up.TempCoh — temporal coherence: how well the fitted time-series reproduces every observed interferogram. High = the velocity model is self-consistent with the data. It sits near 0.95 almost everywhere, so it acts as a gentle second filter alongside Frac.

Avg greenness off

Changing greenness off

Avg greenness — five-year mean Landsat NDVI. Lush, green ground scatters radar poorly and decorrelates, so high average greenness explains where the coherence mask cuts holes in the map. Overlay fades this layer on; Mask removes the greenest points.Changing greenness — the year-to-year swing in NDVI. Cropland that greens up then is harvested cycles moisture and decorrelates between passes, biasing its velocity. Mask removes the biggest swingers.

Coherence floor off

Moisture decay off

Coherence floor (rho) — the long-term coherence Sentinel-1 holds over this ground, measured continent-wide. Green = durable coherence = InSAR works well here. Overlay views all of Australia (zoom out); Mask keeps the high-coherence points.Moisture decay (COH12−COH48) — how fast coherence falls off from short to long time baselines. Red = coherent over days but gone over weeks = moisture-cycling ground that's hard for multi-year InSAR. Mask keeps the low-decay points.

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