Under revision (phase_cycle_jump): Automated time-series QC flagged this headline series for independent review — step 2 (2026-06-29→2026-07-11) = -10.11 cm ≈ one phase cycle (12.1 cm).
Peak Cumulative (LOS)
-15.0 cm
Vertical Est. (47.0°)
-22.0 cm
3-Ref Sensitivity
[-8.1, -5.5] cm LOS
Rate (cm / 100 days)
-12.5 cm/100d
Annualized est.: -16.7 cm/yr
Latest Pair & Cumulative Summary
- Latest Consecutive Pair Step: -2.57 cm LOS (2026-10-03 to 2026-10-15 at p01: 39.737N 116.805E; cumulative at point: -15.00 cm)
- Affected Population (GHSL GHS-POP E2025, 108d eq., ≥ 0.73 cm 2σ): 9,496,168 residents (< -2 cm), 1,544,335 residents across 400.44 km² (< -5 cm).
Top 3 Most-Subsiding Areas
| Rank | 1 km Block Center (Lat, Lon) | Cumulative LOS | Rate |
|---|---|---|---|
| #1 | 39.7436, 116.8035 | -8.40 cm | -7.00 cm/100d |
| #2 | 39.7999, 116.8397 | -7.56 cm | -6.30 cm/100d |
| #3 | 39.8558, 116.6694 | -6.99 cm | -5.82 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
- Peak measured ground motion in Beijing (China) reached -15.0 cm LOS (-12.5 cm/100d) from 2026-06-17 to 2026-10-15, but low coverage or wide reference spread makes this an indicative estimate.
- About 9,496,168 residents live on ground sinking faster than 2 cm per 108 days (and 1,544,335 residents across 400.44 km2 faster than 5 cm per 108 days, above the 0.73 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).