麻豆传媒映画

Before a wildfire starts, the landscape may already hold clues about how severely it could burn.

A study published in April in found pre-fire fuel conditions were dominant drivers of burn severity in three January 2025 Los Angeles County wildfires: the Eaton, Palisades and Hughes fires. The findings suggest conditions on the landscape before ignition, including how abundant, dry or water-stressed vegetation was, played a major role in how severely some areas burned once the fires began.

麻豆传媒映画 geography doctoral student Megan Ward-Baranyay led the research in collaboration with NASA鈥檚 Jet Propulsion Laboratory, a federally funded research institute in La Ca帽ada Flintridge. The study used data from two NASA instruments, the , known as ECOSTRESS, and the , known as EMIT, along with weather and topography information to analyze burn severity across the three fires.

ECOSTRESS and EMIT are mounted on the International Space Station, in orbit 250 miles above Earth. ECOSTRESS measures land surface temperature and helps estimate plant water stress, which can indicate how vegetation is responding to heat and drought. EMIT uses imaging spectroscopy, analyzing reflected light across visible to shortwave infrared wavelengths to identify the composition and characteristics of the Earth鈥檚 surface.

Together, the instruments helped researchers assess fuel conditions across the landscape before the fires began.

Pre-fire fuel conditions are the state of burnable vegetation and other natural materials before ignition. That can include how much vegetation is present, how dry grasses and shrubs are, how much water plants are holding and how stressed vegetation may be during hot, dry conditions.

The study focused on burn severity, a measure of how much fire changes the landscape after it burns. Higher burn severity can damage vegetation, alter soils, increase erosion, affect water quality and slow recovery for ecosystems and nearby communities.

Researchers found fuel-condition measurements derived from ECOSTRESS and EMIT were among the strongest predictors of burn severity in the model, ranking above several weather and terrain variables examined in the study.

The results suggest that understanding the condition of vegetation before a fire may be an important part of assessing where impacts could be most severe once a fire occurs.

鈥淭he results emphasize the critical need to monitor fuel conditions in wildland-urban interfaces that can affect communities, people and the environment,鈥� said Ward-Baranyay. 鈥淏eing able to monitor these conditions can offer actionable insights that support not only wildfire response, but proactive land management decisions as well.鈥�

Wildland-urban interface areas are places where homes and development meet or mix with undeveloped wildland vegetation. Because people, infrastructure and burnable vegetation exist in close proximity, these areas can face elevated wildfire risk.

That makes the findings especially relevant in California, where more people live near fire-prone landscapes and wildfire seasons continue to grow more destructive. Satellite observations can help researchers monitor large areas repeatedly over time, including places that may be difficult to assess through field surveys alone.

Wildfire devastation

The research comes in the wake of fires that brought profound loss to Los Angeles County communities. The researchers recognize that behind every burned acre are people, families, neighborhoods and ecosystems whose lives were changed. While the study examines wildfire impacts through data, it is grounded in the reality that these events carry deep human and environmental consequences, and in the shared hope that better understanding hazards can help protect communities, wildlife, natural habitats and the landscapes they depend on in the future.

The research team included Christine M. Lee of NASA鈥檚 ; Madeleine Pascolini-Campbell of JPL and the California Institute of Technology; Daniel Sousa, associate professor in 麻豆传媒映画鈥檚 ; and Alicia Kinoshita, professor in 麻豆传媒映画鈥檚 .

The work reflects a collaboration between 麻豆传媒映画 researchers and NASA-affiliated scientists using Earth observation tools to better understand one of California鈥檚 most urgent hazards.

For future research, the study opens new questions about how fuel conditions influence burn severity across different vegetation types, landscapes and weather patterns. It also points to the value of continued satellite monitoring that could help strengthen hazard assessments, guide land management decisions and support community preparedness.

鈥淭he most exciting part of the research is that we now have some answers, but even more questions to explore, " said Ward-Baranyay. 鈥淯nderstanding how fuel conditions influence burn severity and long-term recovery will be an important next step.鈥�

As California communities continue to live with wildfire risk, the study suggests preparedness may depend not only on what happens when smoke is already in the air, but also on what the landscape is showing before a fire begins.

According to the researchers, the study would not be possible without the collaboration and support of NASA鈥檚 Jet Propulsion Laboratory, managed by the California Institute of Technology under contract with NASA.

Additional support was provided by the NASA Wildland Fires Program, NASA FireSense, the EMIT Science and Applications Team, and the Gordon and Betty Moore Foundation.