Multi-Sensor Satellite-Based Retrospective Early-Warning Assessment of the 26 August 2026 Flood Event in the Langtang Region of Nepal

Completed catalogue assessment

Eligibility decision: Include · Include
Assessment date: 28 September 2026
Decision reason: Original source identity and relevant content established; exact unsupported metadata replaced and evidential limits recorded.
Metadata corrections: {"validation_status":"not_peer_reviewed","uncertainty_summary":"The heuristic index is uncalibrated against independent events; its retrospective maximum of 44.51 is below the author-selected threshold of 60. It is not a probability or a demonstrated warning system. The stated precipitation anomaly divided by the standard deviation gives approximately −0.324, not the reported −0.24; this source discrepancy is flagged without rewriting the source.","limitations":"The PDF only says scripts can be made available; a repository is separately linked in current landing-page metadata. This manuscript asset does not establish a downloaded executable package. Satellite changes do not establish a specific failure mechanism.","reviewed_on":"2026-09-28","current_status":"eligibility_assessed"}

Catalogue identifier: res-1ba3111e-566d-4475-bdd0-9c1f5db05d23
Persistent identifier: 10.31223/x5kb85
Resource version: Version 1
Publication date: 3 September 2026
Last updated: 3 September 2026
Metadata reviewed: 28 September 2026
Language: English
Geographic coverage: Langtang region and glacierized source area in Rasuwa District, central Nepal.
Bounding box (WGS 84): Not stated
Temporal coverage: 1 January 2020 to 26 August 2026; Multi Year Baseline And Pre Event Analysis
Themes: Early Warning, Remote Sensing, Precipitation, Cryosphere, Surface Water, Multi-Sensor Analysis

Production method: Applies a Google Earth Engine workflow to ERA5-Land precipitation, Sentinel-1, Sentinel-2, MODIS snow cover, GLIMS glaciers, and JRC surface water, then calculates an exploratory retrospective early-warning index.
Provenance: Authored by Avideh Asadollahi and deposited in EarthArXiv; the repository record, Crossref metadata, and current PDF establish the DOI, version, dates, authorship, and licence.
Validation: Not Peer Reviewed
Uncertainty: The heuristic index is uncalibrated against independent events; its retrospective maximum of 44.51 is below the author-selected threshold of 60. It is not a probability or a demonstrated warning system. The stated precipitation anomaly divided by the standard deviation gives approximately −0.324, not the reported −0.24; this source discrepancy is flagged without rewriting the source.
Limitations: The PDF only says scripts can be made available; a repository is separately linked in current landing-page metadata. This manuscript asset does not establish a downloaded executable package. Satellite changes do not establish a specific failure mechanism.

1 asset

Asset bounding box not stated. Parent resource coverage: Langtang region and glacierized source area in Rasuwa District, central Nepal.

PDF · 342.40 KB · Manuscript · Public Route Or Response Documented