Earth and climate
Wildfires: how Copernicus and ESA guide the response on the ground
Prolonged heatwaves and dry soil made the summer of 2026 unusually flammable. How satellite observations turn into evacuation routes and health warnings.
In brief
Copernicus and ESA supply complementary observations, thermal, multispectral and atmospheric, that feed operational maps, evacuations and infrastructure protection. Turning them into results still needs integration with ground measurements, resilience procedures and more frequent updates.
Key points
- Combine thermal and multispectral data to identify active fronts and areas at risk.
- Activate the Copernicus Emergency Management Service for operational maps and evacuation routes.
- Monitor gases and aerosols with Sentinel-5P and lidar for health warnings and temporary closures.
- Define resilience plans and validation procedures for ground stations and critical infrastructure.
The summer of 2026 widened the perception of risk: prolonged heatwaves and dry soil made wildfires more likely. This article explains how the Copernicus constellation and ESA missions observe the surface, detect gases and protect critical infrastructure while authorities organise large-scale evacuations. The thread running through it is how temperature measurements, emergency maps and atmospheric instruments become operational decisions.
When the surface itself becomes dangerous
Satellites measure land surface temperature, which is the actual heat of the ground rather than the air above it. That heating dries vegetation and makes ignition more likely. On 23 June 2026 Sentinel-3 recorded the hottest June day in France, and Copernicus reports that June 2026 was the second warmest June globally. Those figures move the climate baseline upward. The Sea and Land Surface Temperature Radiometer, SLSTR, measures land and sea temperature directly, and its readings show where vegetation stays dry for longer.
Sentinel-2 complements this with multispectral imagery across 13 bands, which allows living vegetation, burned areas and active fronts to be told apart. Infrared bands render living vegetation red in false-colour composites, which makes it easy to separate dark water bodies from burn scars. The combination helps assess not only where fire is burning now, but where the ground is most susceptible to new ignitions in the hours that follow.
From maps to roads: evacuations and logistics
Emergency maps are what make the difference over hours and days. The Copernicus Emergency Management Service supplies maps and data for disaster management, and it has been activated more than 30 times since 1 May 2026, which is a fair measure of the continuous demand for satellite products during crises. On 23 July 2026 the service was activated for central Spain, where imagery helped identify evacuation routes and resupply points.
Concrete examples come from the Gironde, in France, and the Ávila region, in Spain. In the Gironde nearly 220,000 people were evacuated; around Ávila, more than 90,000. Sentinel-2 images from 26 July 2026 showed fire fronts west of Bordeaux, and highlighted a blackened area around Arcachon bay at least four times the surface of Paris. That information was critical in deciding where to concentrate ground assets and humanitarian corridors.
Satellite maps saved lives by determining routes and priorities in the operations room, not in hindsight.
Smoke, gases and the infrastructure on the ground
Satellites see not only the fire but what the fire emits. Sentinel-5P measures gases and aerosols released by wildfires, among them carbon monoxide and particulates, which is what allows smoke dispersion to be forecast and public health to be protected. The EarthCARE mission combines a multispectral imager with a lidar, and the lidar measures vertical smoke profiles: that clarifies how much material stays near the ground compared with how much rises into the upper atmosphere. Those measurements shape health advisories and temporary closures of public spaces.
The threat extends to space infrastructure on the ground. The Cebreros ground station lies 77 km west of Madrid and is equipped with a 35-metre antenna, providing links for missions such as Mars Express and Gaia. On 27 July 2026 the station was confirmed safe after fires in the vicinity. Guaranteeing operational continuity means integrating emergency plans that include periodic satellite updates, ground validation procedures, and clear roles for sharing data with responders.
Speed, resolution and the limits of the observations
Decisions in the field need clear timing and resolution. Sentinel-2 provides high spatial resolution imagery across 13 bands, useful for mapping fronts and burn scars in detail. Sentinel-3 covers wide strips of territory thanks to the Ocean and Land Colour Instrument, which observes a swath 1,270 km across, a generous margin for monitoring extended fires. Latency varies, though. In many emergencies imagery every few hours has to be combined with more frequent thermal data to follow how quickly a fire is evolving.
Conversion limits remain. Estimating the quantity of gas emitted requires comparison with ground measurements, and models that include wind and soil moisture. Larger figures describe the scale of the impact: current assessments estimate that up to 35% of greenhouse gas emissions come from the combustion of organic matter in forests and grasslands, meaning more than a third of the total derives from these sources. That link makes satellite surveillance relevant to mitigation policy, not only to emergency response.
Satellite surveillance is what makes effective mitigation policy measurable rather than aspirational.
The operational picture that emerges is a practical one. Different instruments measure complementary things. Concrete numbers set priorities. Ground stations need resilience plans of their own. What remains open is how to standardise local information flows, define update frequencies, and improve field validation. Only then does imagery become the instrument that saves lives and natural heritage rather than documenting their loss.
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