Under revision (phase_cycle_jump): Automated time-series QC flagged this headline series for independent review — step 4 (2026-07-27→2026-09-13) = -10.53 cm ≈ one phase cycle (12.1 cm).
Peak Cumulative (LOS)
-22.3 cm
Vertical Est. (37.4°)
-28.1 cm
3-Ref Sensitivity
[-22.3, -1.6] cm LOS
Rate (cm / 100 days)
-18.6 cm/100d
Annualized est.: -67.9 cm/yr
Latest Pair & Cumulative Summary
- Latest Consecutive Pair Step: -14.58 cm LOS (2026-09-13 to 2026-10-19 at p01: 28.749N 77.272E; cumulative at point: -22.30 cm)
- Affected Population (GHSL GHS-POP E2025, 108d eq., ≥ 0.69 cm 2σ): 230,452 residents (< -2 cm), 3,020 residents across 0.49 km² (< -5 cm).
Top 3 Most-Subsiding Areas
| Rank | 1 km Block Center (Lat, Lon) | Cumulative LOS | Rate |
|---|---|---|---|
| #1 | 28.5253, 77.1718 | -4.32 cm | -3.60 cm/100d |
| #2 | 28.3544, 77.2956 | -3.10 cm | -2.58 cm/100d |
| #3 | 28.5720, 77.1834 | -2.83 cm | -2.36 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 Delhi (India) reached -22.3 cm LOS (-18.6 cm/100d) from 2026-06-21 to 2026-10-19, but low coverage or wide reference spread makes this an indicative estimate.
- About 230,452 residents live on ground sinking faster than 2 cm per 108 days (and 3,020 residents across 0.49 km2 faster than 5 cm per 108 days, above the 0.69 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).