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System Architecture Diagram

The following component diagram illustrates the full EOHA processing pipeline, from raw data source ingestion through the analytics engine to the output layer. It is drawn as a UML component diagram using the structured boundary-and-component notation.

Pipeline architecture​

EOHA System Architecture — pipeline from data sources through analytics to dashboard output

Layer breakdown​

Data Sources & Ingestion

  • Ground Sensors (Water Quality, DWS) — real-time physical sensor readings
  • Health Registries (NICD, DoH) — national disease case reporting
  • EO Satellites (Sentinel, Landsat) — multispectral imagery every 5–8 days

Processing Pipeline

  • Ingestion & QA — atmospheric correction, cloud masking, schema validation
  • Feature Extraction — computes NDWI, NDVI, SST (sea/surface temperature) from raw bands
  • Storage — Cloud DB (PostgreSQL) + Data Lake (Google Drive / GEE Assets)

Analytics Engine

  • Spatial-Temporal Fusion — joins raster outputs to administrative zone boundaries by GPS coordinate and date
  • Risk Modelling — dual-stream pathogen (malaria) and NCD model producing probability scores

Output Layer

  • Alert System — SMS/email notifications dispatched when outbreak_probability_score > 0.80
  • Surveillance Dashboard — interactive Leaflet map with choropleth risk overlays

Frontend system component diagram​

The following diagram shows the internal component relationships within the frontend EOHA application — how the dashboard, module views, and data services interact.

EOHA Frontend Component Diagram

Full design specification​

The complete architecture is documented in the Design Specification Document v2.

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