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ESA’s Biomass satellite released its first radar images on June 23, 2025, showing forested landscapes in Bolivia and Indonesia. They are not ordinary photographs, and they do not rank Earth’s “most intact” ecosystems or provide final carbon measurements. Their importance is that Biomass is the first satellite to carry a spaceborne P-band synthetic-aperture radar designed to map forest structure and estimate woody biomass.
What the first images show—and what “first” means
The first images released by the European Space Agency (ESA) included a view of part of Bolivia, where deforestation has been substantial, and a view of Indonesia’s Halmahera rainforest and volcanic islands. The radar imagery revealed patterns in forest structure and landscape topography that can be difficult to observe with conventional optical imagery. ESA described the release as an early demonstration of the instrument, not a finished map of forest carbon.
These are false-colour radar visualisations, not visible-light photographs. Their colours represent processed properties of the radar return; they do not show what a person would see from above. ESA’s release did not establish that the scenes were a definitive selection or ranking of the planet’s most intact ecosystems. “First ever” is also narrower than it may sound: Biomass is the first satellite to carry a P-band synthetic-aperture radar in space for this kind of systematic forest observation. Satellites have imaged forests before, and other radar missions have studied vegetation using different radar bands. ESA’s June 23, 2025 announcement explains the initial imagery and its limits.
What Biomass is designed to measure
Biomass is an ESA Earth Explorer research mission intended to improve estimates of above-ground woody biomass—the material in trunks, branches and stems—and understanding of the forest carbon cycle. Trees store carbon in woody material, so changes in forest growth, degradation, loss and regrowth affect carbon stocks and flows. Better information can help refine climate models, forest monitoring and conservation planning, particularly in dense tropical forests and remote areas where existing estimates carry uncertainty.
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The satellite does not directly weigh a forest or read out a carbon total from one image. Scientists infer biomass from radar measurements, using retrieval algorithms, calibration and validation data. Biomass is intended to provide systematic information about forest height and structure across broad areas; those measurements can support estimates of woody biomass, which in turn informs estimates of carbon storage. ESA’s Biomass climate project describes the mission’s role and the use of forest-height and cover-density information, including information informed by spaceborne lidar.
How P-band radar can sense forest structure
Radar actively transmits microwave pulses toward Earth and measures the signal that returns. Unlike optical sensors, it does not depend on sunlight and can collect observations through clouds. Biomass uses P-band radar, whose comparatively long wavelength can penetrate portions of a forest canopy and interact with woody elements and the ground. The returning signal contains information about forest structure and terrain that an optical image alone cannot provide.
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“Sees through the canopy” is a useful shorthand, not a literal transparent view of every tree or of everything beneath the surface. How much useful signal reaches and returns from different parts of a forest depends on vegetation structure, moisture, terrain, viewing geometry, calibration and processing. The instrument measures radar backscatter and interferometric information; scientists must process and interpret those observations to produce research products. Biomass complements optical imagery rather than replacing it. ESA’s instrument overview explains the radar payload.
Mission specifications and timeline
Biomass launched aboard a Vega-C rocket from Kourou, French Guiana, on April 29, 2025. ESA lists a spacecraft mass of approximately 1,250 kg, an orbit altitude of about 666 km and a reflector antenna 12 m in diameter. The mission is planned as a five-year-class effort. The large antenna supports the radar instrument; it does not mean the satellite produces commercial-camera-like visual detail.
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| Milestone | What happened |
|---|---|
| April 29, 2025 | Biomass launched from Kourou, French Guiana, aboard Vega-C. |
| June 23, 2025 | ESA released the first images while the satellite was still in commissioning. The early data demonstrated instrument performance but were not yet suitable for quantifying carbon or supporting scientific conclusions. |
| January 26, 2026 | ESA announced that commissioning was complete and Biomass data were openly available to users worldwide. |
| April 29, 2026 | ESA published further imagery marking the satellite’s first year in orbit. |
The distinction between the first image release and operational data matters: the June 2025 scenes were a technical milestone, not validated biomass products. ESA’s commissioning-complete announcement describes the January 2026 data milestone, and its one-year update covers the April imagery.
What Biomass can and cannot do
Biomass is a specialised scientific instrument, not a universal replacement for other Earth-observation tools. The right choice depends on whether the question is about forest structure, visible land-cover change, sampled canopy height, or detailed site imagery.
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| Source or tool | Best suited to | How it differs from Biomass |
|---|---|---|
| Biomass | Systematic radar observations for forest structure and above-ground woody biomass estimates, including in cloudy regions. | Does not provide a normal colour photograph, a direct carbon reading from one scene, or street-level detail. |
| Sentinel-1 radar | Open radar observations useful for change detection, surface structure and monitoring. | Uses different radar capabilities and does not provide Biomass’s specialised P-band forest-structure measurement. |
| Sentinel-2 and Landsat | Visible and near-infrared imagery, vegetation indices, land-cover mapping and deforestation context. | Optical observations are limited by clouds and darkness and do not replace P-band measurements. |
| GEDI lidar | Forest-height and structure observations along sampled tracks. | Its sampling and measurement geometry differ from Biomass’s planned broader systematic radar mapping. |
| PlanetScope | Frequent, visually interpretable commercial optical monitoring; Planet describes imagery at approximately 3.7 m pixel size with near-daily capture and eight spectral bands. | Useful for optical monitoring, but not a substitute for P-band radar or biomass measurement. Planet’s official pricing page lists paid products and coverage options. |
| Vantor Hub / WorldView | Very high-resolution commercial visual imagery, archive access, tasking and 3D products for detailed site inspection and mapping. | Provides visual intelligence, not Biomass-equivalent canopy-penetrating P-band measurement. See Vantor Hub and its developer documentation. |
| Google Earth Engine | Cloud infrastructure for analysing large satellite and geospatial datasets. | It is an analysis platform, not a satellite or an imagery substitute. Current eligibility and charges are listed in Google Earth Engine pricing. |
How to view or work with Biomass data
ESA’s published images are the easiest way to see what the satellite has observed. Downloading and analysing scientific products is a different task: users may need registration, product documentation, geospatial software such as QGIS, and an understanding of radar geometry, interferometry, terrain effects and quality flags. Large-scale analysis may also require processing or cloud-computing resources. Open access means data are available; it does not guarantee a ready-made map or effortless interpretation.
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- Browse mission information and updates: Start at ESA’s Biomass mission page for mission details and published material.
- Check access and product routes: Use ESA’s Earth-observation data-access guidance and the MAAP Biomass mission page.
- Find data offers and documentation: Consult the MAAP Biomass data offer and ESA Climate Change Initiative Biomass project for relevant products and context.
- Choose processing tools only if needed: For analysis beyond viewing published visuals, use suitable geospatial software or a cloud platform such as Google Earth Engine, checking its access rules and current pricing first.
How to interpret the headline claims
- “First ever”: Correctly refers to the first spaceborne P-band SAR mission of this kind, not the first satellite to photograph forests.
- “Reveals intact ecosystems”: The released scenes show forest and landscape features, but ESA did not present them as a formal ranking of ecological intactness. Intactness can refer to different properties, including low deforestation, old-growth structure, biodiversity or ecological function.
- “Measures carbon”: Biomass estimates woody material; carbon estimates require scientific processing and interpretation. The initial commissioning images were not ready for that purpose.
- “Sees beneath forests”: The longer radar wavelength can sense portions of canopy and terrain, not provide a complete transparent view through all vegetation or soil.
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