Peak Cumulative (LOS)
-1.5 cm
Vertical Est. (42.1°)
-2.0 cm
3-Ref Sensitivity
[-3.9, -1.5] cm LOS
Rate (cm / 100 days)
-1.2 cm/100d
Annualized est.: -4.5 cm/yr
Latest Pair & Cumulative Summary
- Latest Consecutive Pair Step: +0.83 cm LOS (2026-10-05 to 2026-10-17 at p01: 34.180N 109.184E; cumulative at point: -1.47 cm)
- Affected Population (GHSL GHS-POP E2025, 108d eq., ≥ 0.72 cm 2σ): 8,592 residents (< -2 cm), 967 residents across 0.30 km² (< -5 cm).
Top 3 Most-Subsiding Areas
| Rank | 1 km Block Center (Lat, Lon) | Cumulative LOS | Rate |
|---|---|---|---|
| #1 | 34.3491, 109.1799 | -1.69 cm | -1.41 cm/100d |
| #2 | 34.0282, 109.0516 | -1.67 cm | -1.40 cm/100d |
| #3 | 34.1803, 109.1836 | -1.66 cm | -1.39 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 Xi'an (China) reached -1.5 cm LOS (-1.2 cm/100d) from 2026-06-19 to 2026-10-17, but low coverage or wide reference spread makes this an indicative estimate.
- About 8,592 residents live on ground sinking faster than 2 cm per 108 days (and 967 residents across 0.30 km2 faster than 5 cm per 108 days, above the 0.72 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).