FireSat Launch: Early Wildfire Detection System Unveiled

Juliet Rothenberg still vividly recalls the tense moments of evacuating her neighborhood during a California wildfire four years ago. "We were glued to satellite images, constantly checking if the fire had crossed the road," she explains. "If it had, our entire community would have been in jeopardy." Thankfully, the fire didn't cross, but during the evacuation, Juliet found herself waiting hours for updates because, at the time, more detailed data simply wasn’t available.

Wildfires have become a more frequent threat worldwide, with devastating fires reported from Australia to the Amazon and across the United States. The satellite imagery available during Juliet’s evacuation was low-resolution, updated only every 12 hours, and incapable of spotting small fires. "We were left in the dark about our neighborhood's safety," she recalls. "The Bay Area was engulfed in red smoke, but the information we had was no better than what the authorities had."

Already aware of the need for better detection, Juliet, who serves as the Product Director of Climate AI efforts at Google Research, has been involved with FireSat. This groundbreaking satellite project is designed to detect and track wildfires at an early stage. This week, FireSat launched its first satellite, marking a significant milestone. Once the full constellation is operational, it will be able to detect a fire as small as 5x5 meters — roughly the size of a classroom — within just 20 minutes, revolutionizing wildfire management.

Finding Fires Earlier and More Accurately

Google Research and satellite manufacturer Muon Space are key partners in the Earth Fire Alliance, the nonprofit behind FireSat. The funding for the first satellite in the constellation was partly provided by Google.org’s AI Collaboratives: Wildfires initiative, which aims to harness AI to mitigate the impact of wildfires. Google.org contributed $13 million to kickstart the FireSat project.

With funding from Google.org and the Moore Foundation, the FireSat project gained the momentum it needed. Chris Van Arsdale, a co-founder working on climate and energy at Google, was driven by the urgency of the situation. "We knew we had to address CO2 emissions from wildfires," he says. Juliet points out the vicious cycle: warmer, drier climates lead to more frequent wildfires, which release more CO2, exacerbating climate change. Better wildfire management not only helps in reducing emissions but also protects lives and communities.

FireSat builds on previous efforts that started in 2020, including the use of AI and satellite imagery to map wildfire boundaries. This information is made available through Google Search and Maps, helping users understand the scope and location of fires in their area, and providing safety alerts to nearby communities.

Despite advancements in AI-based detection, the team recognized the limitations of current satellite imagery. "Existing satellites take images about every five minutes, but they're too coarse to be truly effective," Chris notes. "You'd be lucky to see anything smaller than a few acres, especially in remote mountainous areas where fires often start from lightning strikes and where aerial surveillance might not be consistent."

The team explored various detection methods, including high-altitude drones, but ultimately chose satellites due to their decreasing cost and collaboration with Muon Space, a company specializing in satellite design and operation.

Building (and Testing) a New AI Model

FireSat uses AI to quickly compare current images with historical data, taking into account factors like local infrastructure and weather to identify fires. "Distinguishing actual fires from environmental noise was challenging," Chris admits. "We needed to find the right threshold to differentiate a real fire from sensor issues or misaligned pixels." This required extensive testing and refinement, including a unique experiment where a team member lit a barbecue and firepit in his backyard, allowing the team to test the sensors from a plane overhead. "The sensors picked it up," says Erica Brand, one of the project managers for FireSat.

Readying for Launch — and the Future

Just before the interviews, the first FireSat satellite arrived at the SpaceX launch site. Yesterday, the Google Research team watched as the rocket carrying the satellite soared into the sky. "Since launch dates can shift, we decided to drive rather than fly," Erica says with a laugh. "We called it the 'minivan caravan plan.'" While excited about the launch, the team is even more eager to see how FireSat will help firefighters and emergency responders react more swiftly and effectively.

Beyond immediate response, FireSat will contribute to the broader understanding of wildfires. The data collected will help build a global historical record of fire spread, aiding scientists in modeling and understanding wildfire behavior. "FireSat isn't just about emergency response," Juliet emphasizes. "It's also a powerful tool for reducing greenhouse gas emissions, beautifully addressing both the symptoms and causes of climate change."