Data Sources & Provenance Catalog
Traceable satellite acquisitions, authoritative geospatial vectors, and ground truth validation frameworks underpinning the FloodGuard AI 3.0 decision engine.
In accordance with operational disaster management standards, FloodGuard AI does not fabricate sensor readings, unvalidated confidence metrics, or synthetic geometries. All flood extents are derived from radiometric thresholding of European Space Agency Copernicus Synthetic Aperture Radar (SAR) observations, cross-referenced against multi-spectral surface reflectance and verified ground incident reports.
Spaceborne Remote Sensing Constellations
Primary active radar and multi-spectral sensors utilized for automated inundation mapping.
Copernicus Sentinel-1 C-SAR
European Space Agency (ESA) Copernicus Programme
S1A_IW_GRDH_1SDV_20220620T001428S1A_IW_GRDH_1SDV_20220528T001427Copernicus Sentinel-2 MSI
European Space Agency (ESA) Copernicus Programme
Geospatial Vector Networks & Facility Registries
Topological street networks and vital life-safety assets used for accessibility graph calculations.
OpenStreetMap Road Topology
ODbL LicenseExtracted via OSMnx within Barpeta, Bajali, and Bongaigaon corridors. Covers 142.8 km of classified routes (National Highway NH-27, State Highway SH-4, Major District Roads, and rural Char links).
Critical Facilities & Shelters
District Contingency RegistryCurated locations of life-safety infrastructure cross-referenced between OSM tags and Assam State Disaster Management Authority contingency plans.
Authoritative Response Agencies & Ground Truth
Situational reports used to corroborate model exposure estimations with field reality.
Assam State Disaster Management Authority daily bulletins covering 32 affected districts, river gauge levels at Beki & Manas rivers, and relief camp headcounts.
National Disaster Response Force staging deployments, motorized boat assets, and char evacuation logs corroborating candidate rescue ingress corridors.
End-to-End Algorithmic Pipeline
Every intermediate stage produces inspectable geospatial artifacts with zero unexplained AI interpolations:
SAR Thresholding
Specular reflection detection on Sentinel-1 VV polarizations (dB < -14.5) with Lee speckle filter (5x5 kernel).
Permanent Water Mask
Difference mapping against pre-monsoon baseline to isolate transient floodwaters from permanent river channels.
Topological Cut
PostGIS ST_Intersects and Shapely spatial overlay against the OSM road graph; road segments severed or marked blocked.
NetworkX Isolation
Bi-directional Dijkstra search from NDRF staging posts to settlements to classify reachable vs isolated communities.