Langtang Lirung — Sentinel-1 change and precursor analysis | Publicly Available Data Resources for the 2026 Nepal Glacier-Related Hazard Cascade

Resource details

Summary: Backscatter-change raster, figures, script and documentation from an independent radar analysis.
Review findings: The change raster is not a failure-scar polygon. Shadow, layover, snow and arbitrary thresholds affect it. A null amplitude precursor does not rule out slow deformation. Depositor discloses AI assistance; reproduction was not performed. Automated appraisal; no independent human screening or manuscript inclusion assigned. Asset assessment REV-20260908-ASSETS-002 completed 10 newly added or rediscovered asset records; 1 retain explicit follow-up. Titles, technical fields, source versions and interpretation limits are recorded in the asset-review export. Resource eligibility and manuscript inclusion remain separate.
Record type: Event Data Or Code
Provider role: Producer And Or Distributor As Documented
Original language: English
First identified: 8 September 2026
Geographic coverage: Source area and/or Bhote Koshi–Trishuli corridor; provider-specific coverage, not a shared surveyed boundary.
Temporal coverage: Event-related observations, analyses and source-specific historical references; dates vary by component.
Collection licence: Under review
Redistribution: Metadata And Links Only; Third Party Bodies Not Published
Source record: Open the source record
Metadata sources: Source 1: zenodo.org
Source 2: zenodo.org
Source 3: api.datacite.org
Source 4: api.datacite.org

Inventory

All 10 asset metadata records have been assessed. 1 have flagged follow-up. Read the screening method and findings.

Listed assets: 10
Provider-stated total: 24192656 bytes summed across source-listed links with known sizes; versions/copies may overlap; unknown sizes excluded
Assets naming another contributor: 0
Confirmed reachable without registration: 10 of 10
Unavailable endpoints: 0

Listed assets

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Pre-event VV backscatter and matched controls — Langtang Lirung figure

299420 bytes (source-listed)PNG

Open source asset

Listed contributor

Sah, Ajay Kumar

Classification

Preview Or Illustration

Pre Event Context

Supporting asset · Metadata assessed 8 September 2026

Reachable without registration · Direct Open · checked 8 September 2026

Screening findings and extracted metadata

Automated metadata and technical review. Resource eligibility and manuscript inclusion are separate decisions.

Inspection basis: Metadata And Structure Reviewed
Temporal assessment: Pre Event Context
Provider: Sah, Ajay KumarSource Recorded · source · Producer/contributor retained from source discovery
Dataset family: Sentinel-1 change and precursor analysisSource Recorded · source · Provider metadata and documented source context
Source identifier: 22541072Source Recorded · source · Native DOI, deposit, commit or file identifier
Source version: 1.0.0Source Recorded · source · Native deposit/release version; not inferred from file name
Publication date: 2026-09-06Source Recorded · source · Native deposit/release publication date; not an acquisition date
Provider checksum: md5:14225668013085b49d53b78dd80200caSource Recorded · source · Provider manifest checksum; not a checksum match claim
Linked file format: PNGObserved Structure · source · Response structure and documented asset role
Evidence role: preview_or_illustrationReview Assessment · source · Source purpose, inspected content and interpretation limits
HTTP response size: 299420Observed Http · source · HEAD Content-Length at recorded time
Provider-stated file bytes: 299420Source Recorded · source · Native manifest file size; numeric zero in legacy CSV means unknown
Source grid dimensions: 2497 × 962 pixelsObserved Structure · source · Encoded image/TIFF header; no scientific pixel validation
Observation and acquisition dates: Primary Sentinel-1 series: 29 June–28 August 2026, 12-day cadenceSource Recorded · source · Source-specific observation dates; publication and processing dates remain separate
Source observation start: 2026-06-29Source Recorded · source · Source-specific acquisition dates; these bounds do not imply continuous observations between acquisitions
Source observation end: 2026-08-28Source Recorded · source · Source-specific acquisition dates; these bounds do not imply continuous observations between acquisitions
Licence identifier: CC-BY-4.0Source Documentation · source · Asset/deposit licence statement; component scope is described separately
Rights statement: Source states CC-BY-4.0. Apply it only to the documented asset scope; separate upstream data and imagery terms remain applicable.Source Documentation · source · Provider metadata and documented source context
Assessment basis: Structure extracted from the linked file and interpreted with provider documentation.Review Assessment · source · Actual inspection scope; no research-code execution or scientific reproduction
Interpretation limit: A null amplitude precursor does not rule out slow deformation. Terrain-matched random controls make threshold-adjacent p-values sensitive to sampling.Review Assessment · source · Source documentation and asset-specific content appraisal
File coordinate system: Not applicable to this asset role
File pixel spacing: Not applicable to this asset role
Source bounds (west, south, east, north): Not applicable to this asset role

A null amplitude precursor does not rule out slow deformation. Terrain-matched random controls make threshold-adjacent p-values sensitive to sampling.

Download screening decisions · Download all metadata and field sources

Catalogue details

Original source title: fig15_precursor_test.png
Asset reference: acand_d68edacc-b197-56dd-b85d-4164c5f6aeb2
Host / aggregator: zenodo.org
Relationship to record: Asset of Sentinel-1 change and precursor analysis. A null amplitude precursor does not rule out slow deformation. Terrain-matched random controls make threshold-adjacent p-values sensitive to sampling.
Upstream source: Not stated or not resolved
Upstream evidence: Source attribution assessed; imported data and independently acquired observations remain distinct.
Dataset family: event_data_or_code
Acquisition date: Primary Sentinel-1 series: 29 June–28 August 2026, 12-day cadence
Spatial resolution: Not stated
Access result: Reachable without registration on 8 September 2026
Provenance: Under review
Rights: Collection licence stated; asset rights need review — Source states CC-BY-4.0. Apply it only to the documented asset scope; separate upstream data and imagery terms remain applicable.
Redistribution: Metadata And Links Only; No Third-Party Asset Bodies Published By This Catalogue.
Production method: Automated metadata and technical assessment completed on 8 September 2026. File structure was inspected within the bounded transfer policy. Research code was not executed.

Evidence: source 1 · source 2 · source 3

Sentinel-1 change analysis — methods, dates, encoding and limitations

6269 bytes (source-listed)Markdown

Open source asset

Listed contributor

Sah, Ajay Kumar

Classification

Metadata And Documentation

Not Applicable To Catalogued Role

Supporting asset · Metadata assessed 8 September 2026

Reachable without registration · Direct Open · checked 8 September 2026

Screening findings and extracted metadata

Automated metadata and technical review. Resource eligibility and manuscript inclusion are separate decisions.

Inspection basis: Metadata Reviewed Body Not Inspected
Temporal assessment: Not Applicable To Catalogued Role
Provider: Sah, Ajay KumarSource Recorded · source · Producer/contributor retained from source discovery
Dataset family: Sentinel-1 change and precursor analysisSource Recorded · source · Provider metadata and documented source context
Source identifier: 22541072Source Recorded · source · Native DOI, deposit, commit or file identifier
Source version: 1.0.0Source Recorded · source · Native deposit/release version; not inferred from file name
Publication date: 2026-09-06Source Recorded · source · Native deposit/release publication date; not an acquisition date
Provider checksum: md5:b026241a5ae5a06ebfa9315051592050Source Recorded · source · Provider manifest checksum; not a checksum match claim
Linked file format: MarkdownSource Recorded · source · Response structure and documented asset role
Evidence role: metadata_or_documentationReview Assessment · source · Source purpose, inspected content and interpretation limits
HTTP response size: 6269Observed Http · source · HEAD Content-Length at recorded time
Provider-stated file bytes: 6269Source Recorded · source · Native manifest file size; numeric zero in legacy CSV means unknown
Observation and acquisition dates: Not stated
Licence identifier: CC-BY-4.0Source Documentation · source · Asset/deposit licence statement; component scope is described separately
Rights statement: Source states CC-BY-4.0. Apply it only to the documented asset scope; separate upstream data and imagery terms remain applicable.Source Documentation · source · Provider metadata and documented source context
Assessment basis: Provider documentation, native file listing and recorded access response were assessed.Review Assessment · source · Actual inspection scope; no research-code execution or scientific reproduction
File coordinate system: Not applicable to this asset role
File pixel spacing: Not applicable to this asset role
Source bounds (west, south, east, north): Not applicable to this asset role
Source observation start: Not applicable to this asset role
Source observation end: Not applicable to this asset role

Download screening decisions · Download all metadata and field sources

Catalogue details

Original source title: README.md
Asset reference: acand_8ec48c8b-a262-58bf-b8f8-7a94baf3ba68
Host / aggregator: zenodo.org
Relationship to record: Asset of Sentinel-1 change and precursor analysis. Documentation or access support for the parent resource.
Upstream source: Not stated or not resolved
Upstream evidence: Source attribution assessed; imported data and independently acquired observations remain distinct.
Dataset family: event_data_or_code
Acquisition date: Not stated
Spatial resolution: Not stated
Access result: Reachable without registration on 8 September 2026
Provenance: Under review
Rights: Collection licence stated; asset rights need review — Source states CC-BY-4.0. Apply it only to the documented asset scope; separate upstream data and imagery terms remain applicable.
Redistribution: Metadata And Links Only; No Third-Party Asset Bodies Published By This Catalogue.
Production method: Automated metadata and technical assessment completed on 8 September 2026. Assessment uses source metadata; full scientific-file structure was not established. Research code was not executed.

Evidence: source 1 · source 2 · source 3

Radar change over historical SRTM relief — Langtang Lirung comparison

2146294 bytes (source-listed)PNG

Open source asset

Listed contributor

Sah, Ajay Kumar

Classification

Preview Or Illustration

Event Analysis

Supporting asset · Metadata assessed 8 September 2026

Reachable without registration · Direct Open · checked 8 September 2026

Screening findings and extracted metadata

Automated metadata and technical review. Resource eligibility and manuscript inclusion are separate decisions.

Inspection basis: Metadata And Structure Reviewed
Temporal assessment: Event Analysis
Provider: Sah, Ajay KumarSource Recorded · source · Producer/contributor retained from source discovery
Dataset family: Sentinel-1 change and precursor analysisSource Recorded · source · Provider metadata and documented source context
Source identifier: 22541072Source Recorded · source · Native DOI, deposit, commit or file identifier
Source version: 1.0.0Source Recorded · source · Native deposit/release version; not inferred from file name
Publication date: 2026-09-06Source Recorded · source · Native deposit/release publication date; not an acquisition date
Provider checksum: md5:497a0af955276b10e3aeaebcfa209ff0Source Recorded · source · Provider manifest checksum; not a checksum match claim
Linked file format: PNGObserved Structure · source · Response structure and documented asset role
Evidence role: preview_or_illustrationReview Assessment · source · Source purpose, inspected content and interpretation limits
HTTP response size: 2146294Observed Http · source · HEAD Content-Length at recorded time
Provider-stated file bytes: 2146294Source Recorded · source · Native manifest file size; numeric zero in legacy CSV means unknown
Source grid dimensions: 3325 × 1254 pixelsObserved Structure · source · Encoded image/TIFF header; no scientific pixel validation
Observation and acquisition dates: Sentinel-1 event pair: 16 and 28 August 2026Source Recorded · source · Source-specific observation dates; publication and processing dates remain separate
Source observation start: 2026-08-16Source Recorded · source · Source-specific acquisition dates; these bounds do not imply continuous observations between acquisitions
Source observation end: 2026-08-28Source Recorded · source · Source-specific acquisition dates; these bounds do not imply continuous observations between acquisitions
Licence identifier: CC-BY-4.0Source Documentation · source · Asset/deposit licence statement; component scope is described separately
Rights statement: Source states CC-BY-4.0. Apply it only to the documented asset scope; separate upstream data and imagery terms remain applicable.Source Documentation · source · Provider metadata and documented source context
Assessment basis: Structure extracted from the linked file and interpreted with provider documentation.Review Assessment · source · Actual inspection scope; no research-code execution or scientific reproduction
Interpretation limit: The terrain in both panels is historical SRTM; only the radar tone changes. This is not post-collapse topography.Review Assessment · source · Source documentation and asset-specific content appraisal
File coordinate system: Not applicable to this asset role
File pixel spacing: Not applicable to this asset role
Source bounds (west, south, east, north): Not applicable to this asset role

The terrain in both panels is historical SRTM; only the radar tone changes. This is not post-collapse topography.

Download screening decisions · Download all metadata and field sources

Catalogue details

Original source title: fig13_real_prepost.png
Asset reference: acand_d62fb292-66ec-5ba4-8593-fad446e5bc7d
Host / aggregator: zenodo.org
Relationship to record: Asset of Sentinel-1 change and precursor analysis. The terrain in both panels is historical SRTM; only the radar tone changes. This is not post-collapse topography.
Upstream source: Not stated or not resolved
Upstream evidence: Source attribution assessed; imported data and independently acquired observations remain distinct.
Dataset family: event_data_or_code
Acquisition date: Sentinel-1 event pair: 16 and 28 August 2026
Spatial resolution: Not stated
Access result: Reachable without registration on 8 September 2026
Provenance: Under review
Rights: Collection licence stated; asset rights need review — Source states CC-BY-4.0. Apply it only to the documented asset scope; separate upstream data and imagery terms remain applicable.
Redistribution: Metadata And Links Only; No Third-Party Asset Bodies Published By This Catalogue.
Production method: Automated metadata and technical assessment completed on 8 September 2026. File structure was inspected within the bounded transfer policy. Research code was not executed.

Evidence: source 1 · source 2 · source 3

VV and VH backscatter-change comparison — Langtang Lirung figure

1471347 bytes (source-listed)PNG

Open source asset

Listed contributor

Sah, Ajay Kumar

Classification

Preview Or Illustration

Event Analysis

Supporting asset · Metadata assessed 8 September 2026

Reachable without registration · Direct Open · checked 8 September 2026

Screening findings and extracted metadata

Automated metadata and technical review. Resource eligibility and manuscript inclusion are separate decisions.

Inspection basis: Metadata And Structure Reviewed
Temporal assessment: Event Analysis
Provider: Sah, Ajay KumarSource Recorded · source · Producer/contributor retained from source discovery
Dataset family: Sentinel-1 change and precursor analysisSource Recorded · source · Provider metadata and documented source context
Source identifier: 22541072Source Recorded · source · Native DOI, deposit, commit or file identifier
Source version: 1.0.0Source Recorded · source · Native deposit/release version; not inferred from file name
Publication date: 2026-09-06Source Recorded · source · Native deposit/release publication date; not an acquisition date
Provider checksum: md5:47f55fa465bf650acc59aa1a5933ae32Source Recorded · source · Provider manifest checksum; not a checksum match claim
Linked file format: PNGObserved Structure · source · Response structure and documented asset role
Evidence role: preview_or_illustrationReview Assessment · source · Source purpose, inspected content and interpretation limits
HTTP response size: 1471347Observed Http · source · HEAD Content-Length at recorded time
Provider-stated file bytes: 1471347Source Recorded · source · Native manifest file size; numeric zero in legacy CSV means unknown
Source grid dimensions: 3420 × 900 pixelsObserved Structure · source · Encoded image/TIFF header; no scientific pixel validation
Observation and acquisition dates: Sentinel-1 event pair: 16 and 28 August 2026Source Recorded · source · Source-specific observation dates; publication and processing dates remain separate
Source observation start: 2026-08-16Source Recorded · source · Source-specific acquisition dates; these bounds do not imply continuous observations between acquisitions
Source observation end: 2026-08-28Source Recorded · source · Source-specific acquisition dates; these bounds do not imply continuous observations between acquisitions
Licence identifier: CC-BY-4.0Source Documentation · source · Asset/deposit licence statement; component scope is described separately
Rights statement: Source states CC-BY-4.0. Apply it only to the documented asset scope; separate upstream data and imagery terms remain applicable.Source Documentation · source · Provider metadata and documented source context
Assessment basis: Structure extracted from the linked file and interpreted with provider documentation.Review Assessment · source · Actual inspection scope; no research-code execution or scientific reproduction
File coordinate system: Not applicable to this asset role
File pixel spacing: Not applicable to this asset role
Source bounds (west, south, east, north): Not applicable to this asset role

Download screening decisions · Download all metadata and field sources

Catalogue details

Original source title: fig12_vv_vh_confirm.png
Asset reference: acand_391a17f6-0c0f-5d67-ac73-9b05a7772b16
Host / aggregator: zenodo.org
Relationship to record: Asset of Sentinel-1 change and precursor analysis. The asset’s content, provenance and use limits are recorded in its metadata assessment.
Upstream source: Not stated or not resolved
Upstream evidence: Source attribution assessed; imported data and independently acquired observations remain distinct.
Dataset family: event_data_or_code
Acquisition date: Sentinel-1 event pair: 16 and 28 August 2026
Spatial resolution: Not stated
Access result: Reachable without registration on 8 September 2026
Provenance: Under review
Rights: Collection licence stated; asset rights need review — Source states CC-BY-4.0. Apply it only to the documented asset scope; separate upstream data and imagery terms remain applicable.
Redistribution: Metadata And Links Only; No Third-Party Asset Bodies Published By This Catalogue.
Production method: Automated metadata and technical assessment completed on 8 September 2026. File structure was inspected within the bounded transfer policy. Research code was not executed.

Evidence: source 1 · source 2 · source 3

Seasonal VH backscatter comparison — 2025 and 2026 figure

262773 bytes (source-listed)PNG

Open source asset

Listed contributor

Sah, Ajay Kumar

Classification

Preview Or Illustration

Historical Baseline

Supporting asset · Metadata assessed 8 September 2026

Reachable without registration · Direct Open · checked 8 September 2026

Screening findings and extracted metadata

Automated metadata and technical review. Resource eligibility and manuscript inclusion are separate decisions.

Inspection basis: Metadata And Structure Reviewed
Temporal assessment: Historical Baseline
Provider: Sah, Ajay KumarSource Recorded · source · Producer/contributor retained from source discovery
Dataset family: Sentinel-1 change and precursor analysisSource Recorded · source · Provider metadata and documented source context
Source identifier: 22541072Source Recorded · source · Native DOI, deposit, commit or file identifier
Source version: 1.0.0Source Recorded · source · Native deposit/release version; not inferred from file name
Publication date: 2026-09-06Source Recorded · source · Native deposit/release publication date; not an acquisition date
Provider checksum: md5:e13e060e2a00fa03db2d3c0ae52a66d1Source Recorded · source · Provider manifest checksum; not a checksum match claim
Linked file format: PNGObserved Structure · source · Response structure and documented asset role
Evidence role: preview_or_illustrationReview Assessment · source · Source purpose, inspected content and interpretation limits
HTTP response size: 262773Observed Http · source · HEAD Content-Length at recorded time
Provider-stated file bytes: 262773Source Recorded · source · Native manifest file size; numeric zero in legacy CSV means unknown
Source grid dimensions: 1850 × 1036 pixelsObserved Structure · source · Encoded image/TIFF header; no scientific pixel validation
Observation and acquisition dates: Second-orbit VH series: 3 June–26 August 2025 and 5 May–22 June 2026Source Recorded · source · Source-specific observation dates; publication and processing dates remain separate
Licence identifier: CC-BY-4.0Source Documentation · source · Asset/deposit licence statement; component scope is described separately
Rights statement: Source states CC-BY-4.0. Apply it only to the documented asset scope; separate upstream data and imagery terms remain applicable.Source Documentation · source · Provider metadata and documented source context
Assessment basis: Structure extracted from the linked file and interpreted with provider documentation.Review Assessment · source · Actual inspection scope; no research-code execution or scientific reproduction
Interpretation limit: The seasonal comparison uses a second acquisition orbit. It must not be mixed with the primary event pair as if viewing geometry were identical.Review Assessment · source · Source documentation and asset-specific content appraisal
File coordinate system: Not applicable to this asset role
File pixel spacing: Not applicable to this asset role
Source bounds (west, south, east, north): Not applicable to this asset role
Source observation start: Not applicable to this asset role
Source observation end: Not applicable to this asset role

The seasonal comparison uses a second acquisition orbit. It must not be mixed with the primary event pair as if viewing geometry were identical.

Download screening decisions · Download all metadata and field sources

Catalogue details

Original source title: fig16_2025_baseline.png
Asset reference: acand_5f437bf7-a1ca-5e4b-a01e-73b914d3b447
Host / aggregator: zenodo.org
Relationship to record: Asset of Sentinel-1 change and precursor analysis. The seasonal comparison uses a second acquisition orbit. It must not be mixed with the primary event pair as if viewing geometry were identical.
Upstream source: Not stated or not resolved
Upstream evidence: Source attribution assessed; imported data and independently acquired observations remain distinct.
Dataset family: event_data_or_code
Acquisition date: Second-orbit VH series: 3 June–26 August 2025 and 5 May–22 June 2026
Spatial resolution: Not stated
Access result: Reachable without registration on 8 September 2026
Provenance: Under review
Rights: Collection licence stated; asset rights need review — Source states CC-BY-4.0. Apply it only to the documented asset scope; separate upstream data and imagery terms remain applicable.
Redistribution: Metadata And Links Only; No Third-Party Asset Bodies Published By This Catalogue.
Production method: Automated metadata and technical assessment completed on 8 September 2026. File structure was inspected within the bounded transfer policy. Research code was not executed.

Evidence: source 1 · source 2 · source 3

VV radar backscatter before and after the cascade — Langtang Lirung figure

3507300 bytes (source-listed)PNG

Open source asset

Listed contributor

Sah, Ajay Kumar

Classification

Preview Or Illustration

Event Analysis

Supporting asset · Metadata assessed 8 September 2026

Reachable without registration · Direct Open · checked 8 September 2026

Screening findings and extracted metadata

Automated metadata and technical review. Resource eligibility and manuscript inclusion are separate decisions.

Inspection basis: Metadata And Structure Reviewed
Temporal assessment: Event Analysis
Provider: Sah, Ajay KumarSource Recorded · source · Producer/contributor retained from source discovery
Dataset family: Sentinel-1 change and precursor analysisSource Recorded · source · Provider metadata and documented source context
Source identifier: 22541072Source Recorded · source · Native DOI, deposit, commit or file identifier
Source version: 1.0.0Source Recorded · source · Native deposit/release version; not inferred from file name
Publication date: 2026-09-06Source Recorded · source · Native deposit/release publication date; not an acquisition date
Provider checksum: md5:775e7e8a9389c57bf7297288f96c0fa6Source Recorded · source · Provider manifest checksum; not a checksum match claim
Linked file format: PNGObserved Structure · source · Response structure and documented asset role
Evidence role: preview_or_illustrationReview Assessment · source · Source purpose, inspected content and interpretation limits
HTTP response size: 3507300Observed Http · source · HEAD Content-Length at recorded time
Provider-stated file bytes: 3507300Source Recorded · source · Native manifest file size; numeric zero in legacy CSV means unknown
Source grid dimensions: 2867 × 1646 pixelsObserved Structure · source · Encoded image/TIFF header; no scientific pixel validation
Observation and acquisition dates: Sentinel-1 event pair: 16 and 28 August 2026Source Recorded · source · Source-specific observation dates; publication and processing dates remain separate
Source observation start: 2026-08-16Source Recorded · source · Source-specific acquisition dates; these bounds do not imply continuous observations between acquisitions
Source observation end: 2026-08-28Source Recorded · source · Source-specific acquisition dates; these bounds do not imply continuous observations between acquisitions
Licence identifier: CC-BY-4.0Source Documentation · source · Asset/deposit licence statement; component scope is described separately
Rights statement: Source states CC-BY-4.0. Apply it only to the documented asset scope; separate upstream data and imagery terms remain applicable.Source Documentation · source · Provider metadata and documented source context
Assessment basis: Structure extracted from the linked file and interpreted with provider documentation.Review Assessment · source · Actual inspection scope; no research-code execution or scientific reproduction
File coordinate system: Not applicable to this asset role
File pixel spacing: Not applicable to this asset role
Source bounds (west, south, east, north): Not applicable to this asset role

Download screening decisions · Download all metadata and field sources

Catalogue details

Original source title: fig11_s1_change.png
Asset reference: acand_c21d0aa3-3d0e-5683-a451-200714e1e5ac
Host / aggregator: zenodo.org
Relationship to record: Asset of Sentinel-1 change and precursor analysis. The asset’s content, provenance and use limits are recorded in its metadata assessment.
Upstream source: Not stated or not resolved
Upstream evidence: Source attribution assessed; imported data and independently acquired observations remain distinct.
Dataset family: event_data_or_code
Acquisition date: Sentinel-1 event pair: 16 and 28 August 2026
Spatial resolution: Not stated
Access result: Reachable without registration on 8 September 2026
Provenance: Under review
Rights: Collection licence stated; asset rights need review — Source states CC-BY-4.0. Apply it only to the documented asset scope; separate upstream data and imagery terms remain applicable.
Redistribution: Metadata And Links Only; No Third-Party Asset Bodies Published By This Catalogue.
Production method: Automated metadata and technical assessment completed on 8 September 2026. File structure was inspected within the bounded transfer policy. Research code was not executed.

Evidence: source 1 · source 2 · source 3

VV backscatter change — Langtang Lirung, 28 minus 16 August 2026 (GeoTIFF)

16486485 bytes (source-listed)GeoTIFF

Open source asset

Listed contributor

Sah, Ajay Kumar

Classification

Derived Or Compiled Data

Event Analysis

Data candidate · Metadata assessed 8 September 2026

Reachable without registration · Direct Open · checked 8 September 2026

Establish the export’s radiometric encoding before quantitative reuse; source-inferred scaling is not independently calibrated here.

Screening findings and extracted metadata

Automated metadata and technical review. Resource eligibility and manuscript inclusion are separate decisions.

Inspection basis: Metadata And Structure Reviewed
Temporal assessment: Event Analysis
Provider: Sah, Ajay KumarSource Recorded · source · Producer/contributor retained from source discovery
Dataset family: Sentinel-1 change and precursor analysisSource Recorded · source · Provider metadata and documented source context
Source identifier: 22541072Source Recorded · source · Native DOI, deposit, commit or file identifier
Source version: 1.0.0Source Recorded · source · Native deposit/release version; not inferred from file name
Publication date: 2026-09-06Source Recorded · source · Native deposit/release publication date; not an acquisition date
Provider checksum: md5:caa4a84790c1e874fe2ff3f1086c25d5Source Recorded · source · Provider manifest checksum; not a checksum match claim
Linked file format: GeoTIFFObserved Structure · source · Response structure and documented asset role
Evidence role: data_or_data_bearing_productReview Assessment · source · Source purpose, inspected content and interpretation limits
HTTP response size: 16486485Observed Http · source · HEAD Content-Length at recorded time
Provider-stated file bytes: 16486485Source Recorded · source · Native manifest file size; numeric zero in legacy CSV means unknown
Source grid dimensions: 2500 × 1648 pixelsObserved Structure · source · Encoded image/TIFF header; no scientific pixel validation
Raster bands: 1Observed Structure · source · TIFF SamplesPerPixel
Raster data type: 32-bit floating pointObserved Structure · source · TIFF BitsPerSample and SampleFormat
File coordinate system: EPSG:4326Observed Structure · source · GeoTIFF coordinate reference key
File pixel spacing: 8.83024e-05 × 7.778216019e-05 degreesObserved Structure · source · GeoTIFF ModelPixelScaleTag; grid spacing, not measurement accuracy
File coordinate bounds: 85.445824, 28.223038, 85.66658, 28.351223 (west, south, east, north; file CRS)Derived From Observed Structure · source · Raster dimensions, tie point and pixel scale; outer grid bounds
File bounds (WGS 84): [85.445824,28.223038,85.66658,28.351223]Derived From Observed Structure · source · EPSG:4326 raster outer grid bounds
Sensor: Sentinel-1D C-band SAR, VVSource Documentation · source · README product table and event-pair identifiers
Variable units: VV backscatter difference in dB, post minus preSource Documentation · source · README Contents and Value encoding
Value-encoding limitation: The author inferred dB = (v − 1) × 20 from scene statistics. Absolute radiometric calibration was not applied.Source Documentation · source · README Value encoding
Observation and acquisition dates: Sentinel-1 event pair: 16 and 28 August 2026Source Recorded · source · Source-specific observation dates; publication and processing dates remain separate
Source observation start: 2026-08-16Source Recorded · source · Source-specific acquisition dates; these bounds do not imply continuous observations between acquisitions
Source observation end: 2026-08-28Source Recorded · source · Source-specific acquisition dates; these bounds do not imply continuous observations between acquisitions
Licence identifier: CC-BY-4.0Source Documentation · source · Asset/deposit licence statement; component scope is described separately
Rights statement: Source states CC-BY-4.0. Apply it only to the documented asset scope; separate upstream data and imagery terms remain applicable.Source Documentation · source · Provider metadata and documented source context
Assessment basis: Structure extracted from the linked file and interpreted with provider documentation.Review Assessment · source · Actual inspection scope; no research-code execution or scientific reproduction
Interpretation limit: The raster records VV backscatter change, not a mapped failure scar. Its dB conversion is inferred by the author and not absolutely calibrated; the 6 dB delineation threshold is arbitrary.Review Assessment · source · Source documentation and asset-specific content appraisal
Source bounds (west, south, east, north): Not stated

The raster records VV backscatter change, not a mapped failure scar. Its dB conversion is inferred by the author and not absolutely calibrated; the 6 dB delineation threshold is arbitrary.

Download screening decisions · Download all metadata and field sources

Catalogue details

Original source title: langtang_S1_change_dB.tif
Asset reference: acand_b2df5c2f-e686-59ad-b46b-884e299c0f09
Host / aggregator: zenodo.org
Relationship to record: Asset of Sentinel-1 change and precursor analysis. The raster records VV backscatter change, not a mapped failure scar. Its dB conversion is inferred by the author and not absolutely calibrated; the 6 dB delineation threshold is arbitrary.
Upstream source: Not stated or not resolved
Upstream evidence: Source attribution assessed; imported data and independently acquired observations remain distinct.
Dataset family: event_data_or_code
Acquisition date: Sentinel-1 event pair: 16 and 28 August 2026
Spatial resolution: 8.83024e-05 × 7.778216019e-05 degrees output grid; not an accuracy estimate
Access result: Reachable without registration on 8 September 2026
Provenance: Under review
Rights: Collection licence stated; asset rights need review — Source states CC-BY-4.0. Apply it only to the documented asset scope; separate upstream data and imagery terms remain applicable.
Redistribution: Metadata And Links Only; No Third-Party Asset Bodies Published By This Catalogue.
Production method: Automated metadata and technical assessment completed on 8 September 2026. File structure was inspected within the bounded transfer policy. Research code was not executed.

Evidence: source 1 · source 2 · source 3

Sentinel-1 change and precursor analysis — Python source code

12768 bytes (source-listed)Python

Open source asset

Listed contributor

Sah, Ajay Kumar

Classification

Source Code

Event Analysis

Supporting asset · Metadata assessed 8 September 2026

Reachable without registration · Direct Open · checked 8 September 2026

Screening findings and extracted metadata

Automated metadata and technical review. Resource eligibility and manuscript inclusion are separate decisions.

Inspection basis: Metadata Reviewed Body Not Inspected
Temporal assessment: Event Analysis
Provider: Sah, Ajay KumarSource Recorded · source · Producer/contributor retained from source discovery
Dataset family: Sentinel-1 change and precursor analysisSource Recorded · source · Provider metadata and documented source context
Source identifier: 22541072Source Recorded · source · Native DOI, deposit, commit or file identifier
Source version: 1.0.0Source Recorded · source · Native deposit/release version; not inferred from file name
Publication date: 2026-09-06Source Recorded · source · Native deposit/release publication date; not an acquisition date
Provider checksum: md5:ad17925914c8d51a0f2020d538161e9cSource Recorded · source · Provider manifest checksum; not a checksum match claim
Linked file format: PythonSource Recorded · source · Response structure and documented asset role
Evidence role: source_codeReview Assessment · source · Source purpose, inspected content and interpretation limits
HTTP response size: 12768Observed Http · source · HEAD Content-Length at recorded time
Provider-stated file bytes: 12768Source Recorded · source · Native manifest file size; numeric zero in legacy CSV means unknown
Observation and acquisition dates: Not stated
Licence identifier: CC-BY-4.0Source Documentation · source · Asset/deposit licence statement; component scope is described separately
Rights statement: Source states CC-BY-4.0. Apply it only to the documented asset scope; separate upstream data and imagery terms remain applicable.Source Documentation · source · Provider metadata and documented source context
Assessment basis: Provider documentation, native file listing and recorded access response were assessed.Review Assessment · source · Actual inspection scope; no research-code execution or scientific reproduction
Interpretation limit: Source code was read as text only. Its reproducibility claims and outputs were not executed by this review.Review Assessment · source · Source documentation and asset-specific content appraisal
File coordinate system: Not stated
File pixel spacing: Not stated
Source bounds (west, south, east, north): Not stated
Source observation start: Not stated
Source observation end: Not stated

Source code was read as text only. Its reproducibility claims and outputs were not executed by this review.

Download screening decisions · Download all metadata and field sources

Catalogue details

Original source title: s1_langtang_analysis.py
Asset reference: acand_f7828b51-2191-51ad-bd30-650472edc7ff
Host / aggregator: zenodo.org
Relationship to record: Asset of Sentinel-1 change and precursor analysis. Source code was read as text only. Its reproducibility claims and outputs were not executed by this review.
Upstream source: Not stated or not resolved
Upstream evidence: Source attribution assessed; imported data and independently acquired observations remain distinct.
Dataset family: event_data_or_code
Acquisition date: Not stated
Spatial resolution: Not stated
Access result: Reachable without registration on 8 September 2026
Provenance: Under review
Rights: Collection licence stated; asset rights need review — Source states CC-BY-4.0. Apply it only to the documented asset scope; separate upstream data and imagery terms remain applicable.
Redistribution: Metadata And Links Only; No Third-Party Asset Bodies Published By This Catalogue.
Production method: Automated metadata and technical assessment completed on 8 September 2026. Assessment uses source metadata; full scientific-file structure was not established. Research code was not executed.

Evidence: source 1 · source 2 · source 3

Sentinel-1 change and precursor analysis — DOI metadata, all-version concept record (JSON)

Not stated; zero in numeric field means unknownJSON

Open source asset

Listed contributor

Sah, Ajay Kumar

Classification

Metadata And Documentation

Not Applicable To Catalogued Role

Supporting asset · Metadata assessed 8 September 2026

Reachable without registration · Direct Open · checked 8 September 2026

Screening findings and extracted metadata

Automated metadata and technical review. Resource eligibility and manuscript inclusion are separate decisions.

Inspection basis: Metadata And Structure Reviewed
Temporal assessment: Not Applicable To Catalogued Role
Provider: Sah, Ajay KumarSource Recorded · source · Producer/contributor retained from source discovery
Dataset family: Sentinel-1 change and precursor analysisSource Recorded · source · Provider metadata and documented source context
Source identifier: 10.5281/zenodo.22541071Source Recorded · source · Native DOI, deposit, commit or file identifier
Source version: 1.0.0Source Recorded · source · Native deposit/release version; not inferred from file name
Linked file format: JSONObserved Structure · source · Response structure and documented asset role
Evidence role: metadata_or_documentationReview Assessment · source · Source purpose, inspected content and interpretation limits
Provider-stated file bytes: Not stated
Structured contents: dataObserved Structure · source · Top-level keys; arrays and files may have different units of observation
Observation and acquisition dates: Not stated
Licence identifier: Not stated
Rights statement: This JSON describes a DOI record. Its rights declarations concern the deposited resource; metadata-response reuse terms have not been separately charted.Review Assessment · source · Provider metadata and documented source context
Assessment basis: Structure extracted from the linked file and interpreted with provider documentation.Review Assessment · source · Actual inspection scope; no research-code execution or scientific reproduction
File coordinate system: Not applicable to this asset role
File pixel spacing: Not applicable to this asset role
Source bounds (west, south, east, north): Not applicable to this asset role
Source observation start: Not applicable to this asset role
Source observation end: Not applicable to this asset role

Download screening decisions · Download all metadata and field sources

Catalogue details

Original source title: zenodo.22541071
Asset reference: acand_e4ed0d8c-3124-5c7b-a273-c6fe94269b5f
Host / aggregator: api.datacite.org
Relationship to record: Asset of Sentinel-1 change and precursor analysis. Documentation or access support for the parent resource.
Upstream source: Not stated or not resolved
Upstream evidence: Source attribution assessed; imported data and independently acquired observations remain distinct.
Dataset family: event_data_or_code
Acquisition date: Not stated
Spatial resolution: Not stated
Access result: Reachable without registration on 8 September 2026
Provenance: Under review
Rights: Not stated — This JSON describes a DOI record. Its rights declarations concern the deposited resource; metadata-response reuse terms have not been separately charted.
Redistribution: Metadata And Links Only; No Third-Party Asset Bodies Published By This Catalogue.
Production method: Automated metadata and technical assessment completed on 8 September 2026. File structure was inspected within the bounded transfer policy. Research code was not executed.

Evidence: source 1 · source 2 · source 3

Sentinel-1 change and precursor analysis — DOI metadata, version 1.0.0 (JSON)

Not stated; zero in numeric field means unknownJSON

Open source asset

Listed contributor

Sah, Ajay Kumar

Classification

Metadata And Documentation

Not Applicable To Catalogued Role

Supporting asset · Metadata assessed 8 September 2026

Reachable without registration · Direct Open · checked 8 September 2026

Screening findings and extracted metadata

Automated metadata and technical review. Resource eligibility and manuscript inclusion are separate decisions.

Inspection basis: Metadata And Structure Reviewed
Temporal assessment: Not Applicable To Catalogued Role
Provider: Sah, Ajay KumarSource Recorded · source · Producer/contributor retained from source discovery
Dataset family: Sentinel-1 change and precursor analysisSource Recorded · source · Provider metadata and documented source context
Source identifier: 10.5281/zenodo.22541072Source Recorded · source · Native DOI, deposit, commit or file identifier
Source version: 1.0.0Source Recorded · source · Native deposit/release version; not inferred from file name
Linked file format: JSONObserved Structure · source · Response structure and documented asset role
Evidence role: metadata_or_documentationReview Assessment · source · Source purpose, inspected content and interpretation limits
Provider-stated file bytes: Not stated
Structured contents: dataObserved Structure · source · Top-level keys; arrays and files may have different units of observation
Observation and acquisition dates: Not stated
Licence identifier: Not stated
Rights statement: This JSON describes a DOI record. Its rights declarations concern the deposited resource; metadata-response reuse terms have not been separately charted.Review Assessment · source · Provider metadata and documented source context
Assessment basis: Structure extracted from the linked file and interpreted with provider documentation.Review Assessment · source · Actual inspection scope; no research-code execution or scientific reproduction
File coordinate system: Not applicable to this asset role
File pixel spacing: Not applicable to this asset role
Source bounds (west, south, east, north): Not applicable to this asset role
Source observation start: Not applicable to this asset role
Source observation end: Not applicable to this asset role

Download screening decisions · Download all metadata and field sources

Catalogue details

Original source title: zenodo.22541072
Asset reference: acand_8210d09e-193d-53bf-adb2-7b10b860f81a
Host / aggregator: api.datacite.org
Relationship to record: Asset of Sentinel-1 change and precursor analysis. Documentation or access support for the parent resource.
Upstream source: Not stated or not resolved
Upstream evidence: Source attribution assessed; imported data and independently acquired observations remain distinct.
Dataset family: event_data_or_code
Acquisition date: Not stated
Spatial resolution: Not stated
Access result: Reachable without registration on 8 September 2026
Provenance: Under review
Rights: Not stated — This JSON describes a DOI record. Its rights declarations concern the deposited resource; metadata-response reuse terms have not been separately charted.
Redistribution: Metadata And Links Only; No Third-Party Asset Bodies Published By This Catalogue.
Production method: Automated metadata and technical assessment completed on 8 September 2026. File structure was inspected within the bounded transfer policy. Research code was not executed.

Evidence: source 1 · source 2 · source 3