NISAR Vision Bulletin — Yunlin (Taiwan) — 2026-10-14

Atlas Rank #26 · Coverage: ok · 8 pairs
CONFIDENCE: LOW (indicative only) PROVISIONAL All Bulletins
Product IDNP-YUNLIN-2026-001
Issue Time (UTC)2026-11-15 15:42 UTC
Data Window2026-06-28 to 2026-10-14
SensorNISAR L-band GUNW, provisional
Quality ClassPROVISIONAL
ConfidenceLOW (indicative only)
Versionv2.0
FormatA4 Operational Map Package
Peak Cumulative (LOS)
-2.7 cm
Vertical Est. (37.0°)
-3.4 cm
3-Ref Sensitivity
[-3.5, -1.1] cm LOS
Rate (cm / 100 days)
-2.5 cm/100d
Annualized est.: -9.2 cm/yr

Latest Pair & Cumulative Summary

  • Latest Consecutive Pair Step: -1.39 cm LOS (2026-10-02 to 2026-10-14 at p01: 23.624N 120.560E; cumulative at point: -2.73 cm)
  • Affected Population (GHSL GHS-POP E2025, 108d eq., ≥ 0.74 cm 2σ): 27,204 residents (< -2 cm), 902 residents across 2.39 km² (< -5 cm).

Top 3 Most-Subsiding Areas

Rank1 km Block Center (Lat, Lon)Cumulative LOSRate
#123.7964, 120.1897-2.36 cm-2.18 cm/100d
#223.8540, 120.2599-2.28 cm-2.11 cm/100d
#323.5004, 120.4403-1.70 cm-1.58 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

Cumulative LOS displacement map for Yunlin (Taiwan) ending 2026-10-14
Cumulative LOS displacement (2026-06-28 to 2026-10-14, 8 NISAR L2 GUNW pairs).

What This Means

  • Peak measured ground motion in Yunlin (Taiwan) reached -2.7 cm LOS (-2.5 cm/100d) from 2026-06-28 to 2026-10-14, but low coverage or wide reference spread makes this an indicative estimate.
  • About 27,204 residents live on ground sinking faster than 2 cm per 108 days (and 902 residents across 2.39 km2 faster than 5 cm per 108 days, above the 0.74 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).