Technology5 min read
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.
By SpaceNexus Desk · AI-draftedMarch 19, 2026
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)
Track EO satellites and constellations at SpaceNexus Satellite Tracker.
Week in Space Data, every Friday
Free Friday email: launches flown, funding, hiring and schedule slips, from our own trackers.
Explore this topic with our Satellite Tracker
Try Satellite Tracker →Get space industry intelligence delivered
Join SpaceNexus for real-time data, market intelligence, and expert insights.
Get Started FreeKeep reading
- Analysis19 SepMDA Space Bets on Data-as-a-Service: A Three-Tier Platform Reshapes Who Profits from Earth ObservationMDA Space's new three-tier software portfolio (spanning archive search, hosted ground stations, and finished intelligence products) pushed its shares up 4.8% and signals a broader industry pivot from selling satellite...SpaceNexus Desk · AI-drafted
- Analysis27 SepSenate Passes Secure Space Act Unanimously: FCC Gains New Authority to Block Adversary-Linked Satellite LicensesThe U.S. Senate unanimously passed the Secure Space Act of 2025 on September 25, 2026, giving the FCC explicit authority to deny satellite and earth-station authorizations to entities tied to equipment on its Covered...SpaceNexus Desk · AI-drafted
- Mission debrief27 SepElectron · Owlright, Owlright, Owlright (StriX Launch 13): mission debriefRocket Lab successfully launched an Electron rocket from Launch Complex 1 on the Mahia Peninsula, New Zealand, on 2026-09-26, carrying a synthetic aperture radar (SAR) satellite for Japanese Earth-imaging company...SpaceNexus Desk · AI-drafted