Mission control for satellite emergency response.
Fuse live disaster feeds with satellite access windows, revisit timelines, and downlink planning.

---

What is LETO?

LETO is a browser-first mission control dashboard for satellite emergency response. It answers the critical question:

"Given my satellites and ground stations, which incident can I observe first — and how quickly can I get the data down?"

Built for satellite imagery analysts, emergency coordinators, and field operators who need rapid triage under time pressure.

Key Capabilities

Feature	Description
🔥 Live Feeds	NASA FIRMS (fires), GDACS (floods/cyclones), NASA EONET (natural events), USGS (earthquakes)
🛰️ Orbit Propagation	SGP4/TLE propagation for real satellites; circular orbit generator for synthetic constellations
🗺️ Access Windows	AOI imaging passes, station contact windows, revisit gap analysis
⏱️ Time-to-Information	TTFO (time to first observation) + TTDL (time to downlink) per incident
📊 Serviceability Scoring	Weighted 0-100 score combining observation latency + downlink latency + gap coverage
🎯 Interactive Map	Satellite basemap with ground tracks, footprints, AOI boundaries, incident markers
📈 Gantt Timeline	Visual pass schedule with access windows, downlink windows, station contacts
⚙️ Scenario Editor	Configure AOIs, satellites, stations, horizons, timesteps in real-time

---

Architecture

┌─────────────────────────────────────────────────────────────────┐
│                         DATA SOURCES                             │
│  NASA FIRMS ──►│                                               │
│  GDACS ───────►│  ┌─────────────┐    ┌─────────────────────┐  │
│  NASA EONET ──►├──►│  Ingestion  │───►│  Satellite Engine   │  │
│  USGS ────────►│  │   + Cache   │    │  (SGP4/Access calc) │  │
│                │  └─────────────┘    └─────────────────────┘  │
│                │                          │                     │
│                │                    ┌─────┴─────┐              │
│                │                    ▼           ▼              │
│                │              ┌─────────┐  ┌──────────┐       │
│                │              │ Tracks  │  │ Windows  │       │
│                │              │ Access  │  │ Revisit  │       │
│                │              └────┬────┘  └────┬─────┘       │
│                │                   └─────┬──────┘             │
│                │                         ▼                    │
│                │              ┌──────────────────┐            │
│                │              │  Incident Scores │            │
│                │              │   + Serviceability│            │
│                │              └──────────────────┘            │
└─────────────────────────────────────────────────────────────────┘
                              │
                              ▼
┌─────────────────────────────────────────────────────────────────┐
│                         UI LAYERS                                │
│  ┌──────────────┐  ┌──────────────┐  ┌──────────────────────┐  │
│  │Incident Queue│  │ Tactical Map │  │  Selected Incident   │  │
│  │  + Filters   │  │ + Layers     │  │  + Tabs + Metrics    │  │
│  └──────────────┘  └──────────────┘  └──────────────────────┘  │
│  ┌──────────────────────────────────────────────────────────┐  │
│  │           Gantt Timeline (Pass Schedule)                  │  │
│  └──────────────────────────────────────────────────────────┘  │
└─────────────────────────────────────────────────────────────────┘

---

Quick Start

# Clone the repo
git clone https://github.com/benajaero/leto.git
cd leto

# Install dependencies
pnpm install

# Run development server
pnpm dev

# Run tests
pnpm test

# Build for production
pnpm build

FIRMS API Key (Optional)

For live fire data from NASA FIRMS, get a free API key at firms.modaps.eosdis.nasa.gov/api/map_key/ and paste it into LETO's settings panel. Without a key, LETO falls back to bundled sample data.

---

Data Sources

Source	Type	Latency	Auth
NASA FIRMS	Active fires (VIIRS/MODIS)	~3 hours	Free API key
GDACS	Floods, cyclones, earthquakes	~1 hour	None
NASA EONET	Natural events (fires, storms, volcanoes)	~1 hour	None
USGS Earthquakes	M2.5+ earthquakes	Real-time	None

⚠️ Decision-support only. Not a sole source for operational response. All data feeds have latency, coverage gaps, and correction cycles. The UI surfaces timestamps and source status for transparency.

---

Tech Stack

• Framework: Next.js 14 (App Router, static export)
• State: Zustand (split stores: engine + UI)
• Styling: Tailwind CSS v3 (custom aerospace dark theme)
• Orbits: satellite.js (SGP4 propagation)
• Maps: Leaflet + react-leaflet (CartoDB Dark Matter tiles)
• Testing: Vitest
• Deploy: Vercel

---

Roadmap

• Core engine (SGP4, access windows, revisit)
• Live data feeds (FIRMS, GDACS, EONET, USGS)
• Interactive map with satellite basemap
• Gantt timeline for pass scheduling
• Scenario editor
• Mobile-responsive layout
• 3D globe view (Cesium/Three.js)
• Weather overlay integration
• Multi-user collaboration
• Tasking request generation

---

Contributing

See CONTRIBUTING.md for workflow, testing, and spec updates. By participating, you agree to the CODE_OF_CONDUCT.md.

License

Copyright 2026 Chukwudiebube Ebenezer Ajaero

Licensed under the Apache License, Version 2.0. See LICENSE for details.

Attribution

• NASA FIRMS (Active Fire data)
• GDACS (Global Disaster Alert and Coordination System)
• NASA EONET (Earth Observatory Natural Event Tracker)
• USGS Earthquake Hazards Program
• CelesTrak (TLE data)