Monsoonal Early Warning System · Microwave radar detection at 30m resolution — sense, forecast, route, and alert before the waters rise.
Spaceborne Radar Command
Access the full-resolution spatial intelligence interface, interactive MapLibre GL radar overlays, flood risk telemetry, and automated CAP 1.2 bilingual alerting.
National Inundation Footprint
Operations Console Capabilities
Engineered for disaster management operators, hydrologists, and emergency dispatchers requiring sub-kilometer precision and honest uncertainty disclosure.
Split-Curtain Optical vs Radar Wipe
Compare NASA VIIRS 375m TrueColor pre-flood optical imagery directly against Sentinel-1 30m microwave SAR flood detection. Drag the curtain divider anywhere on the canvas to distinguish turbid rivers from flash-inundated agricultural fields.
115 FFWC Telemetry Hydrographs
Hover over any gauging station on the Jamuna, Meghna, Padma, or Surma rivers to inspect 24-hour rate of rise (▲ Rising / ▼ Falling), peak crest records, and Danger Level margins.
Multi-Hazard Peril Scorecards
Every detected flood polygon features a unified severity badge (Critical Lvl 5 to Moderate Lvl 2), exposed union demographics, severed transport infrastructure, and verified shelter routing.
URL Deep-Linking & Real-Time Sync
Synchronize viewports, layer configurations, and active polygons directly into shareable URLs to coordinate emergency response personnel with zero ambiguity.
How to Use the Operations Console
Inspect Inundation Extents
Engage Split-Curtain Swipe
Interrogate River Gauges
Plan Evacuation & Shelters
Review Alerts & Share View
Six Pinned Verification Stages
Every operational stage is deterministic, versioned, and bound by the Honesty Doctrine.
SAR capture
Sentinel-1 IW GRD · VV+VH · 30 m
Sentinel-1 IW GRD · Dual-Pol (VV/VH) · 30m resolution
Detection
d3v4.2 U-Net · τ=0.5 · 1,199 polygons
d3v4.2 U-Net · 6.3M parameters · τ=0.5 sigmoid threshold
Forecast
LightGBM + uncertainty bands
LightGBM F5 Spatio-Temporal Model + GloFAS runoff integration
Exposure
HRSL population overlay
Meta / Columbia CIESIN High Resolution Settlement Layer (30m)
Routes & shelters
EVE passability → evacuation
EVE Dijkstra Network · Road breaches & concrete shelter graph
Alert (CAP 1.2)
Bilingual draft → human approval
OASIS CAP 1.2 Digital Emergency Payload · Bilingual EN/BN
Complete 10-Layer Geospatial Directory
All physical sensors, optical basemaps, radar algorithms, and humanitarian exposure models in the console.
NASA VIIRS TrueColor (375m)
NASA GIBS VIIRS SNPP Corrected Reflectance (EPSG:3857)
“The sky as the eye would see it from 824 kilometers above. Daily sun-synchronous passes frame the macro geography of the Ganges-Brahmaputra-Meghna delta.”
Natural visual-spectrum composite capturing natural surface coloration, cloud dynamics, and river sedimentation plumes in the Bay of Bengal.
Native EPSG:3857 WebMercator Level 9 tile matrix (256×256px), dynamic date query.
Detected Flooding (Sentinel-1 SAR)
Sentinel-1 C-Band SAR (IW Mode, VV + VH, 30m)
“When torrential rain obscures the delta for weeks, radar sees in the dark, mapping flooded paddies and submerged homesteads at 30-meter precision.”
Active microwave pulses penetrate monsoonal cloud decks. Smooth standing water acts as a specular reflector, bouncing radar energy away from the antenna (dark signature).
d3v4.2 U-Net (EfficientNet-B0, 6ch, τ=0.5). 1,199 polygons across 21,954 km² with interactive Split-Curtain swipe against NASA VIIRS optical baseline.
Copernicus GFM Live Flood
Copernicus Emergency Management Service GFM WMS-T
“An independent European orbital witness providing multi-model cross-validation against national detection inferences.”
Harmonized ensemble of three independent SAR flood algorithms (TU Wien, DLR, LIST) executing on all global Sentinel-1 downlinks.
OGC WMS-T streaming layer with ISO 8601 temporal querying.
NASA MCDWD 2-Day Flood Composite
NASA LANCE Near Real-Time MCDWD (MODIS Composite)
“A rapid macro-catchment sensor. Grey denotes dry ground; bright red indicates flood water; cyan denotes sensor shadow.”
Multi-spectral water indices across optical and thermal infrared bands identifying surface water anomalies during cloud breaks.
NASA GIBS TileMatrixSet with daily compositing.
River Erosion & Bankline Migration
Centroid Transect Vector Migration (2016–2021)
“Bangladesh is living land that breathes and carves. The Jamuna and Padma shift entire kilometers in a single flood season.”
Morphological contour tracking across dynamic braided river systems (Jamuna, Padma, Lower Meghna) measuring structural bank collapse.
Shoreline vector polygons, erosion hazard zones, and longitudinal rate transects.
Water Level Telemetry Gauges
Flood Forecasting and Warning Centre (FFWC) Network
“The ground-truth pulse of the rivers anchoring satellite inferences with observed stage hydrographs.”
Physical water level gauges measuring river stage height relative to Public Works Datum (PWD) and historical Danger Levels.
Interactive SVG hydrographs with 24h rising/falling rate, danger thresholds, and real-time pointer crosshair tracking across 115 national stations.
Population Exposure (HRSL 30m)
Meta / Columbia CIESIN High Resolution Settlement Layer
“Flood polygons are geographical data; people are the human reality. Computes affected population down to individual unions.”
Spatial intersection of SAR inundation polygons with high-resolution population density rasters aggregated to Union Parishad administrative units.
20.5M total national exposure estimate (Feni basin: 184,615 directly exposed).
Forecast Risk Horizon (T+1 to T+7)
LightGBM F5 Two-Branch Spatio-Temporal Model
“Water that has fallen in the transboundary hills today arrives in the haor basin in 48 hours. Forecasts the wave before it crests.”
Hydrological wave propagation estimating downstream inundation expansion from upstream Meghalaya/Assam hill runoff.
Probability rasters stamped with explicit honest uncertainty bounds.
Evacuation Routing & Shelters (EVE)
EVE (Evacuation Vector Engine) Depth-Cost Dijkstra Graph
“Knowing where the water is is only half the battle; knowing where to run is life-saving.”
Depth-cost graph traversal routing stranded communities along elevated dry ridges to designated concrete flood and cyclone shelters.
Honest fallback: If roads are severed, triggers shelter-in-place boat rescue guidance.
CAP 1.2 Bilingual Alerting
OASIS Common Alerting Protocol v1.2 (Bilingual EN/BN)
“Converts complex radar and demographic intelligence into unambiguous, actionable public warnings.”
Structured digital emergency payload requiring 4 verification gates (schema validity, exposure threshold, multi-sensor corroboration, human sign-off).
Bilingual Bengali and English advisories with time-bounded go-before instructions.
Backend Status, Storage & Upgrades
Zero static secrets, permanent Google Cloud ADC OAuth token refresh at $0.00/mo, and automated gating transparency.
Permanent ADC OAuth Storage ($0.00/mo)
GCP Project: project-300d4e0e-5c73-49bf-b8a
Google Cloud organization policy enforces disableServiceAccountKeyCreation. The pipeline authenticates through a verified ADC token refresh loop:
Why Live Sentinel-1 Loop Was Paused
Operational Safety & Calibration Gate
One-sided lower quantile regression on binary masks produced a tautological coverage (0/10 publishable deciles). Under the Honesty Doctrine, automated advisories with uncalibrated percentages are blocked.
Automated dry-season mosaics raised Negative Control False Positive Rate from 0.335 to 0.611. Live triggers were safely paused until the index upgrade.
Three Ready-to-Deploy Zero-Compute Upgrades
CONSEMA Morphological Margin Bands
Replaces the broken parametric conformal band with deterministic 2D Euclidean morphological distance transforms (scipy.ndimage.distance_transform_edt). Computes core inundation via erosion and uncertainty margins bounded by HAND gradients in <400ms on CPU.
Channel 5 Swap to SDWI (Dual-Pol Index)
Eliminates the external Google Earth Engine 80GB dry-reference requirement using SDWI = ln(10 · VV · VH) - 8. Cancels seasonal soil dielectric moisture shifts and isolates specular open water without false positive spikes.
Sub-Second CPU ONNX Export
Converts the 6.3M parameter PyTorch checkpoint (d3v4.2_best.pt) into an optimized ONNX runtime graph. Cuts memory footprint from 4.2GB (PyTorch+CUDA) to <350MB on standard lightweight CPU workers.
Honest by design
In life-safety systems, transparency is non-negotiable.
Replay data is flagged amber everywhere it appears — never a silent green.
One district fully real beats twenty half-real. Depth over breadth, on purpose.
Every advisory links back to its SAR pass, model version and provenance.
Replay data labeled SEEDED DATA; never disguised as live telemetry.
Timestamps carry "estimate · pending recalibration".
Every advisory links directly to raw satellite pass timestamps & model version.
Feni benchmark validated before expanding to national breadth.