pectoraux/ghana-digital-twin

Ghana Digital Twin — AI-native geospatial world model of the Republic of Ghana # Ghana Digital Twin (GDT) A continuously updating, AI-native geospatial world model of the Republic of Ghana. Built on Next.js 16 with a 224-model Prisma schema, 259 API routes, 7 live data connectors, and a 25-rule Bayesian intelligence engine that detects illegal mining, deforestation, flood risk, cocoa disease, and land-use change from satellite imagery. ## Architecture ``` Satellite/SAR/Rainfall/Cadastre → Connectors → Raster Products (200×200/tile) → Observation Engine → Bayesian Hypothesis Engine (25 rules, 9 types) → Mission Planner (EVI-ranked) → Community Verification (photo + witness) → Calibration Loop (auto-confirm → GroundTruth → computeCalibration) ``` ### Core Pipeline 1. **Connectors** fetch data from STAC APIs, OSM, geoBoundaries, and custom sources 2. **Raster Products** compute spectral indices (NDVI, NDWI, BSI, NBR) at ~110m/cell resolution per tile 3. **Observation Engine** detects anomalies vs seasonal baselines 4. **Intelligence Engine** generates Bayesian hypotheses with 25 rules across 9 types 5. **Mission Planner** auto-creates verification missions (EVI-ranked) 6. **Community Loop** — citizens report incidents, attach geotagged photos, witnesses confirm/reject 7. **Calibration Loop** — confirmed events auto-create GroundTruth records and trigger calibration ### Evidence Categories All 5 evidence categories are populated by connectors: - **Vegetation** — NDVI/BSI anomalies (Sentinel-2) - **Hydrology** — NDWI water body changes (Sentinel-2) - **Infrastructure** — mining cadastre + OSM features (licensed concessions, roads, settlements) - **Terrain** — DEM elevation/slope/bench-cut geometry - **Atmospheric** — CHIRPS seasonal rainfall ## Consumer Experience 7 primary views accessible from the nav rail (desktop) or bottom tab bar (mobile): - **Home** — greeting, reputation cards with sparklines + tier labels, activity map, intelligence pulse, missions, quick actions - **Intelligence Feed** — filterable feed with colored left borders, i …