NISAR Vision Bulletin — Hanoi (Vietnam) — 2026-10-17

Atlas Rank #28 · Coverage: ok · 9 pairs
CONFIDENCE: LOW (indicative only) PROVISIONAL All Bulletins
Product IDNP-HANOI-2026-001
Issue Time (UTC)2026-11-15 15:42 UTC
Data Window2026-06-19 to 2026-10-17
SensorNISAR L-band GUNW, provisional
Quality ClassPROVISIONAL
ConfidenceLOW (indicative only)
Versionv2.0
FormatA4 Operational Map Package
Peak Cumulative (LOS)
-2.5 cm
Vertical Est. (45.9°)
-3.6 cm
3-Ref Sensitivity
[-6.7, -2.2] cm LOS
Rate (cm / 100 days)
-2.1 cm/100d
Annualized est.: -7.5 cm/yr

Latest Pair & Cumulative Summary

  • Latest Consecutive Pair Step: -2.57 cm LOS (2026-10-05 to 2026-10-17 at p01: 20.983N 105.715E; cumulative at point: -2.48 cm)
  • Affected Population (GHSL GHS-POP E2025, 108d eq., ≥ 0.71 cm 2σ): 85,952 residents (< -2 cm), 3,372 residents across 1.61 km² (< -5 cm).

Top 3 Most-Subsiding Areas

Rank1 km Block Center (Lat, Lon)Cumulative LOSRate
#120.9831, 105.7146-2.48 cm-2.07 cm/100d
#220.9833, 105.6646-2.36 cm-1.97 cm/100d
#321.0490, 105.6649-2.05 cm-1.71 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 Hanoi (Vietnam) ending 2026-10-17
Cumulative LOS displacement (2026-06-19 to 2026-10-17, 9 NISAR L2 GUNW pairs).

What This Means

  • Peak measured ground motion in Hanoi (Vietnam) reached -2.5 cm LOS (-2.1 cm/100d) from 2026-06-19 to 2026-10-17, but low coverage or wide reference spread makes this an indicative estimate.
  • About 85,952 residents live on ground sinking faster than 2 cm per 108 days (and 3,372 residents across 1.61 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).