Natural Disaster Tracking

The Natural layer combines two authoritative sources for comprehensive disaster monitoring, providing real-time alerts with severity assessments and satellite-derived event detection.

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GDACS (Global Disaster Alert and Coordination System)

UN-backed disaster alert system providing official severity assessments: Alert Levels:

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NASA EONET (Earth Observatory Natural Event Tracker)

Near-real-time natural event detection from satellite observation:

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Multi-Source Deduplication

When both GDACS and EONET report the same event:

1. Events within 100km and 48 hours are considered duplicates
2. GDACS severity takes precedence (human-verified)
3. EONET geometry provides more precise coordinates
4. Combined entry shows both source attributions

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Filtering Logic

To prevent map clutter, natural events are filtered:

• Wildfires: Only events < 48 hours old (older fires are either contained or well-known)
• Earthquakes: M4.5+ globally, lower threshold for populated areas
• Storms: Only named storms or those with warnings