Peak Cumulative (LOS)
-2.4 cm
Vertical Est. (42.3°)
-3.2 cm
3-Ref Sensitivity
[-2.4, -1.6] cm LOS
Rate (cm / 100 days)
-2.0 cm/100d
Annualized est.: -7.2 cm/yr
Latest Pair & Cumulative Summary
- Latest Consecutive Pair Step: -0.10 cm LOS (2026-10-07 to 2026-10-19 at p01: 38.141N 116.665E; cumulative at point: -2.37 cm)
- Affected Population (GHSL GHS-POP E2025, 108d eq., ≥ 0.77 cm 2σ): 16,737 residents (< -2 cm), 434 residents across 0.96 km² (< -5 cm).
Top 3 Most-Subsiding Areas
| Rank | 1 km Block Center (Lat, Lon) | Cumulative LOS | Rate |
|---|---|---|---|
| #1 | 38.1414, 116.6654 | -2.49 cm | -2.07 cm/100d |
| #2 | 38.5355, 117.0932 | -2.38 cm | -1.98 cm/100d |
| #3 | 38.3851, 116.6405 | -2.25 cm | -1.88 cm/100d |
Top 5 At-Risk Infrastructure Segments
Infrastructure corridor ranking (OSM canal/road overlay) has not been computed for this regional subset yet.
GNSS Comparison & Calibration Status
Continuous GNSS time-series validation was not bundled for this regional subset.
Cumulative Displacement Map
What This Means
- Ground in Cangzhou (China) subsided up to -2.4 cm LOS (-2.0 cm/100d) between 2026-06-21 and 2026-10-19, consistent with active seasonal compaction.
- About 16,737 residents live on ground sinking faster than 2 cm per 108 days (and 434 residents across 0.96 km2 faster than 5 cm per 108 days, above the 0.77 cm 2-sigma noise floor).
- No local GNSS or canal-tilt overlay is bundled for this subset; field inspection and local piezometer records are needed to confirm infrastructure impacts.
Calibration & Quality Notice (PROVISIONAL): NISAR data are provisional. Calibration and validation are carried out by the NISAR project (NASA-JPL and ISRO), not by our team.
Sources: NASA-ISRO NISAR L2 GUNW (CRID P05023 via ASF DAAC); GHSL GHS-POP E2025 R2023A (JRC, CC BY 4.0); Nevada Geodetic Laboratory GNSS; OpenStreetMap (ODbL).
Sources: NASA-ISRO NISAR L2 GUNW (CRID P05023 via ASF DAAC); GHSL GHS-POP E2025 R2023A (JRC, CC BY 4.0); Nevada Geodetic Laboratory GNSS; OpenStreetMap (ODbL).