What Is Earth Observation? How Satellites Image Our Planet
Earth observation satellites capture imagery used for agriculture, disaster response, climate monitoring, and intelligence. Learn how the technology works.
Earth observation (EO) is one of the largest commercial applications of space technology. Hundreds of satellites image the planet daily, generating data used across agriculture, insurance, defense, environmental monitoring, and urban planning. The global EO market is projected to exceed $8 billion by 2027.
How Satellite Imaging Works
- Optical (visible/near-infrared): Digital cameras in space capturing reflected sunlight. Resolution ranges from 30cm (military/commercial high-res) to 300m (weather satellites). Requires clear skies and daylight
- Synthetic Aperture Radar (SAR): Active radar that generates its own signal. Works through clouds, at night, and in all weather. Companies like Capella Space and ICEYE offer SAR imagery
- Multispectral: Captures light across multiple wavelength bands (visible + infrared). Used for vegetation health (NDVI), water quality, and mineral detection
- Hyperspectral: Captures hundreds of narrow wavelength bands. Identifies materials by their spectral signature. Used for mining exploration and environmental monitoring
Key EO Operators
- Planet Labs: 200+ Dove satellites imaging the entire planet daily at 3m resolution. Also operates SkySat constellation at 50cm
- Maxar: Operates WorldView Legion constellation at 30cm resolution. Primary supplier to US intelligence community
- Airbus: Pleiades Neo constellation at 30cm resolution. Strong European government customer base
- BlackSky: Real-time monitoring constellation with revisit times under 1 hour for priority targets
Applications
- Agriculture: Precision farming — monitor crop health, predict yields, detect irrigation issues across millions of acres
- Insurance: Damage assessment after natural disasters, property verification, and risk modeling
- Defense: Intelligence gathering, change detection, maritime domain awareness
- Climate: Deforestation monitoring, ice cap measurement, emissions tracking (methane plumes visible from space)
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