Peak Cumulative (LOS)
-6.2 cm
Vertical Est. (40.4°)
-8.1 cm
3-Ref Sensitivity
[-9.9, -6.2] cm LOS
Rate (cm / 100 days)
-6.5 cm/100d
Annualized est.: -23.6 cm/yr
Latest Pair & Cumulative Summary
- Latest Consecutive Pair Step: -0.52 cm LOS (2026-09-17 to 2026-09-29 at p01: -6.810N 110.608E; cumulative at point: -6.20 cm)
- Affected Population (GHSL GHS-POP E2025, 108d eq., ≥ 0.71 cm 2σ): 780,050 residents (< -2 cm), 37,731 residents across 58.05 km² (< -5 cm).
Top 3 Most-Subsiding Areas
| Rank | 1 km Block Center (Lat, Lon) | Cumulative LOS | Rate |
|---|---|---|---|
| #1 | -6.8100, 110.6079 | -6.20 cm | -6.46 cm/100d |
| #2 | -6.8288, 110.6550 | -5.46 cm | -5.68 cm/100d |
| #3 | -7.1391, 110.4947 | -5.40 cm | -5.62 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 Semarang (Indonesia) subsided up to -6.2 cm LOS (-6.5 cm/100d) between 2026-06-25 and 2026-09-29, consistent with active seasonal compaction.
- About 780,050 residents live on ground sinking faster than 2 cm per 108 days (and 37,731 residents across 58.05 km2 faster than 5 cm per 108 days, above the 0.71 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).