Peak Cumulative (LOS)
-1.3 cm
Vertical Est. (35.8°)
-1.6 cm
3-Ref Sensitivity
[-1.3, -1.1] cm LOS
Rate (cm / 100 days)
-1.1 cm/100d
Annualized est.: -4.0 cm/yr
Latest Pair & Cumulative Summary
- Latest Consecutive Pair Step: -0.18 cm LOS (2026-10-03 to 2026-10-15 at p01: 38.009N 121.644W; cumulative at point: -1.33 cm)
- Affected Population (GHSL GHS-POP E2025, 108d eq., ≥ 0.69 cm 2σ): 632 residents (< -2 cm), 155 residents across 6.13 km² (< -5 cm).
Top 3 Most-Subsiding Areas
| Rank | 1 km Block Center (Lat, Lon) | Cumulative LOS | Rate |
|---|---|---|---|
| #1 | 38.0375, -121.6439 | -1.96 cm | -1.63 cm/100d |
| #2 | 37.9644, -121.8229 | -0.96 cm | -0.80 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 Sacramento–San Joaquin Delta (USA) subsided up to -1.3 cm LOS (-1.1 cm/100d) between 2026-06-17 and 2026-10-15, consistent with active seasonal compaction.
- About 632 residents live on ground sinking faster than 2 cm per 108 days (and 155 residents across 6.13 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).