Definitive flood footprint
Establish an empirical inundation boundary based on Sentinel SAR and optical imagery.
← All basin intelligence modules
Illustrative agriculture imageryPOST-EVENT SATELLITE DELINEATION
Post-Flood Extent Mapping — Satellite inundation delineation & infrastructure review.
Observed inundation footprint, water depth classification, and affected infrastructure candidate review derived from all-weather SAR and high-resolution optical satellite passes. Designed for incident review, damage reporting, and civil recovery.
AVAILABLE · GET ENDPOINTSee how it works ↓
THE DECISION IT SUPPORTS
What was the actual extent of flood inundation—and which critical infrastructure was submerged?
Following flood events, AtmosGrid processes Sentinel-1 radar and optical passes to delineate water boundaries through cloud cover. Analysts review affected roads, bridges, and structures with explicit timestamps and review metadata.
Built for
- River sensor network operators
- Catchment flood warning authorities
- Hydrological digital twin platforms
- Municipal flood defense & siren controllers
WHY TEAMS USE IT
Turn broad data into a clearer next step.
Each result is designed to narrow a decision, show the inputs behind it, and surface what must still be checked locally.
Quantify civil infrastructure impact
Calculate submerged road kilometers, overtopped bridges, and affected facility counts.
Support post-event insurance & grants
Deliver transparent, timestamped satellite evidence for recovery funding.
Clear operational boundaries
Explicitly classified for post-incident review rather than immediate tactical warning.
FROM REGION TO FIELD
See where each signal fits.
Images illustrate the operational setting. They are not live observations; use source timestamps and local measurements for decisions.
SATELLITE SAR DELINEATIONAll-weather radar water boundary detection
Penetrates storm cloud cover using Sentinel-1 radar passes to trace true peak flood inundation boundaries.
INFRASTRUCTURE SCREENINGOvertopped roads, bridges and structures
Overlays flood boundaries against GIS transportation and civic assets for post-event damage reporting.
INCIDENT REVIEW QUEUEHuman validation for civil reporting
Candidates remain pending until verified against ground evidence. Strictly not an immediate siren trigger.
THE INFORMATION STACK
What goes in—and what it helps explain.
Availability is stated per input. AtmosGrid never converts a missing parcel observation into a made-up field value.
INFORMATIONSOURCEHOW IT IS USEDSTATUS
01Sentinel-1 C-Band SAR passesCopernicus SAR constellationAll-weather water surface backscatter delineation.AVAILABLE ON ORBIT PASS
02Sentinel-2 Multi-Spectral OpticalCopernicus optical constellationHigh-resolution true color and NDWI water indices.CLOUD-DEPENDENT
03Infrastructure GIS layersMunicipal open data / OSMRoad networks, bridges, and critical buildings.REQUIRED
04Pre-flood baseline water maskAtmosGrid permanent water registrySeparates permanent lakes and rivers from flood inundation.REQUIRED
A PRACTICAL WORKFLOW
From input to reviewable decision.
The workflow keeps model context, field evidence and human approval in their proper places.
- 01
Acquire post-event satellite passes
Ingest Sentinel-1 SAR and optical passes over the affected catchment.
- 02
Delineate open water backscatter
Segment low-backscatter water bodies and filter terrain shadow artifacts using DEM.
- 03
Intersect with infrastructure GIS
Calculate submerged transportation links, overtopped bridges, and facility perimeters.
- 04
Deliver validated incident report
Submit package to review queue for hydrologist sign-off before civil publication.
HOW INFORMATION BECOMES USEFUL
Examples of decisions it can inform.
These are screening patterns, not automatic instructions. Operational thresholds and local advisories remain authoritative.
Post-event damage assessment for municipal recovery funding
- Signal
- SAR imagery delineates 18.7 km² inundated area, intersecting 14.8 km of municipal roads.
- Useful action
- Export verified flood boundary GeoJSON and impact summary for government disaster relief filing.
- Check before acting
- Cross-reference with drone surveys in dense urban street canyons where SAR shadow occurs.
Insurance claim validation for flooded commercial facilities
- Signal
- Satellite pass at 2026-09-29 05:32 UTC proves commercial estate was within active inundation polygon.
- Useful action
- Generate timestamped flood verification certificate with satellite pass metadata.
- Check before acting
- Water depth is estimated from terrain contours and should be calibrated with high-water marks.
Incident review of flood defense performance
- Signal
- Inundation boundary shows flood water was successfully contained by western levee system.
- Useful action
- Incorporate validated footprint into digital twin post-mortem analysis.
- Check before acting
- Do not use this product as an immediate siren trigger due to satellite revisit latency.
FOR PRODUCT TEAMS
A transparent API contract.
The response exposes gaps and limitations so an application can explain confidence instead of hiding it.
/api/v1/hydrology/basin/flood-extentExample request
{
"event_id": "event-2026-09-storm-brenda",
"catchment_id": "basin-wye-severn-upper"
}decision responseExample response
{
"event_id": "event-2026-09-storm-brenda",
"catchment_id": "basin-wye-severn-upper",
"module_classification": "Post-Flood Extent Mapping (Post-Incident Review)",
"extent_delineation": {
"total_inundated_area_km2": 18.7,
"water_depth_classification": {
"shallow_ponding_under_0_3m_km2": 9.4,
"moderate_inundation_0_3_to_1_0m_km2": 6.2,
"deep_submersion_over_1_0m_km2": 3.1
}
},
"infrastructure_impact_screening": {
"roads_submerged_km": 14.8,
"bridges_overtopped_count": 2,
"agricultural_land_submerged_hectares": 1240,
"commercial_structures_within_footprint": 38
},
"review_status": "validated_by_hydrologist",
"usage_disclaimer": "Post-flood extent mapping is generated after orbital passes become available. It is strictly intended for incident review, damage estimation, and civil reporting. It is NEVER used as an immediate automated siren trigger."
}CAPABILITY BOUNDARIES
Useful now. Honest about what comes next.
Supported now
- Empirical SAR all-weather flood inundation footprint delineation
- Water depth classification (shallow, moderate, deep submersion)
- Submerged road network and bridge overtopping impact screening
- Incident review queue and hydrologist validation metadata
Additional data required
- Post-event satellite orbital pass coverage over target catchment
- Local GIS layers for critical municipal infrastructure
BUILD RESPONSIBLY
Use the result to focus attention—not replace field judgment.
Pair AtmosGrid’s regional weather context with local measurements, crop stage, variety guidance and qualified agricultural advice.