Fighting Bushfires Goes High Tech With Laser Drones, Sensors And Satellites

SYDNEY—In October, a sensor mounted on an 8.5-metre pole in the Australian countryside detected small particles in the air near a timber plantation and sent out an alert.

When plantation staff arrived, they found a small man-made fire that was already under control, but the incident offered a glimpse of how authorities hope to use new technology to battle bushfires that have grown increasingly intense in recent years.

As a new fire season begins in Australia—a recent bushfire ravaged about half of Fraser Island in the country’s east—researchers are looking to rely more on technology to find blazes quickly and better predict their path.

A monthslong government inquiry into the devastating 2019-2020 fire season in Australia, which killed more than two dozen people and burned an area bigger than Washington state, concluded that authorities need to be better prepared and recommended that officials work with the private sector to develop new technology.

“We’re still detecting fires with people in towers and binoculars. We’ve got to move beyond that,” said Leigh Kelson, program director at FireTech Connect in Australia, a government-funded effort to help startups develop new firefighting technologies. Firefighters also rely on the equivalent of 911 calls to find new blazes.

The ideas researchers are exploring include fitting drones with lasers that can map dry areas at higher fire risk and whether satellites can detect extreme fire behaviour.

Last fire season, authorities were surprised by how quickly the blazes spread and how long they burned, which they later attributed to a prolonged drought that had left the land parched with plenty of dry vegetation to fuel the flames. Last year was Australia’s hottest year on record, according to the government’s Bureau of Meteorology, and fires are projected to become more intense and frequent because of climate change.

Parts of Australia have received more rainfall in recent months, and the current fire season isn’t expected to be as severe. Still, firefighters have struggled to control some of the blazes. The fire on Fraser Island, the largest sand island in the world and a Unesco World Heritage site, prompted officials to tell some residents to evacuate from homes in the path of the flames. On Sunday, firefighters said rainfall had finally helped to contain that blaze, which started in mid-October.

Other regions, including the western U.S. and even in frosty Siberia, have experienced particularly intense fire seasons recently, stretching global firefighting resources and making early detection of fires more crucial. Fires left unchecked can create their own weather systems, raining embers down on nearby communities and pushing dangerous smoke into big cities and even to neighbouring countries.

The sensor that picked up the October fire near the timber plantation is one of more than 40 in a network that covers an area nearly double the size of New York City in Australia’s Victoria state. The solar-powered, cylinder-shaped sensors are packed with instruments including optical and thermal cameras, flame detectors, particle counters for air quality, and ground-vibration readers. The data are publicly available online in real-time.

Attentis Pty. Ltd., a Melbourne, Australia-based company, finished installing the network in early 2019 as a pilot project to demonstrate the technology. They didn’t get much use detecting fires last season because the blazes were too far away.

Cameron McKenna, managing director at the company, said he is in talks to install similar sensor networks to improve fire detection capabilities in other parts of the country. “We use multiple methods of detection as opposed to a single method,” he said.

In Canberra, Australia’s capital, researchers are working with a local firefighting agency to install video cameras on four fire towers. One tower will also have a thermal camera installed.

A computer program will scan images from the thermal camera to detect fires, and a person will monitor the other video feeds. Researchers plan to develop a computer program to automatically scan the video feeds too, said Marta Yebra, director of the Australian National University Bushfire Initiative. The idea is to determine whether the cameras detect new fires quicker than the old-fashioned way of having a person in the fire tower, she said.

Rohan Scott, who leads the rural fire service in the Canberra area, said people in towers on average spot fires within seven minutes of ignition. But the towers are only staffed on high-risk days.

“If we can get detection 24/7 but at the same speed as a human-manned fire tower, then I think that would be a good outcome,” he said. “Anything quicker than that would be a definite bonus.”

Other ideas involve using drones fitted with lasers to create detailed maps so authorities know which areas have more dry vegetation and present a higher fire risk. One recent effort involved researchers poring over satellite imagery in an attempt to build a model for detecting extreme fire behaviour from orbit. They found that changes in smoke colours could help predict fire behaviour, according to the Minderoo Foundation, a nonprofit that sponsored the research.

One company, Fireball.International Pty. Ltd., says its machine-learning method can detect smoke from ground-based cameras and fires from heat signatures on thermal-satellite images. Its system is already being used by a big power company in California, and Fireball plans to begin pilot programs in Australia this fire season, executives said.

A prototype of the system detected smoke from fires within 15 minutes of ignition, while averaging less than one false positive a day per camera, according to an analysis published in a peer-reviewed journal in January. It said there is room for improvement.

“People are beginning to realise, ‘Gosh, we really can detect a fire in the first five minutes,’” said Tim Ball, an academic and co-founder of the company who is also a former firefighter.

They call themselves TikTok refugees—and the app they are fleeing to is a lot more Chinese than the video-sharing app whose U.S. fate now hangs in the balance.

After Supreme Court justices Friday seemed inclined to let stand a law that would shut down TikTok in the U.S., the Chinese social-media platform Xiaohongshu , translated in English as Little Red Book, has received a flood of American TikTok users. They are looking for a sanctuary or a way to protest the potentially imminent TikTok ban—never mind that they don’t speak Chinese.

Charlotte Silverstein, a 32-year-old publicist in Los Angeles, downloaded Xiaohongshu on Sunday night after seeing videos on TikTok about migrating to the app, which Americans dubbed “RedNote.” She described the move as a “last act of defiance” in her frustration about the potential TikTok ban.

“Everyone has been super welcoming and sweet,” said Silverstein, who has made three posts so far. “I love the sense of community that I’m seeing already.”

By Monday, TikTok refugees had pushed Xiaohongshu to the top of the free-app chart on Apple ’s App Store.

“I’m really nervous to be on this app, but I also find it to be really exciting and thrilling that we’re all doing this,” one new Xiaohongshu user said in a video clip on Sunday. “I’m sad that TikTok might actually go, but if this is where we’re gonna be hanging out, welcome to my page!” Within a day, the video had more than 3,000 comments and 6,000 likes. And the user had amassed 24,000 followers.

Neither Xiaohongshu nor TikTok responded to requests for comment.

The flow of refugees, while serving as a symbolic dissent against TikTok’s possible shutdown, doesn’t mean Xiaohongshu can easily serve as a replacement for Americans. TikTok says it has 170 million users in the U.S., and it has drawn many creators who take advantage of the app’s features to advertise and sell their products.

Most of the content on Xiaohongshu is in Chinese and the app doesn’t have a simple way to auto-translate the posts into English.

At a time of a strained U.S.-China relationship, some new Chinese-American friendships are budding on an app that until now has had few international users.

“I like that two countries are coming together,” said Sarah Grathwohl, a 32-year-old marketing manager in Seattle, who made a Xiaohongshu account on Sunday night. “We’re bonding over this experience.”

Granthwohl doesn’t speak Chinese, so she has been using Google Translate for help. She said she isn’t concerned about data privacy and would rather try a new Chinese app than shift her screentime to Instagram Reels.

Another opportunity for bonding was a photo of English practice questions from a Chinese textbook, with the caption, “American please.” American Xiaohongshu users helped answer the questions in the comments, receiving a “thank u Honey,” from the person who posted the questions.

By Monday evening, there have been more than 72,000 posts with the hashtag #tiktokrefugee on Xiaohongshu, racking up some 34 million views.

In an English-language post titled “Welcome TikTok refugees,” posted by a Shanghai-based Xiaohongshu user, an American user responded in Chinese with a cat photo and the words, “Thank you for your warm welcome. Everyone is so cute. My cat says thanks, too.” The user added, “I hope this is the correct translation.”

Some Chinese users are also using the livestreaming function to invite TikTok migrants to chat. One chat room hosted by a Chinese English tutor had more than 179,900 visits with several Americans exchanging cultural views with Chinese users.

ByteDance-owned TikTok isn’t available in China but has a Chinese sister app, Douyin. American users can’t download Douyin, though; unlike Xiaohongshu, it is only accessible from Chinese app stores.

On Xiaohongshu, Chinese users have been sharing tutorials and tips in English for American users on how to use the app. Meanwhile, on TikTok, video clips have also multiplied over the past two days teaching users the correct pronunciation of Xiaohongshu—shau-hong-SHOO—and its culture.

Xiaohongshu may be new to most Americans, but in China, it is one of the most-used social-media apps. Backed by investors like Chinese tech giants Tencent Holdings and Alibaba Group , Xiaohongshu is perhaps best described as a Chinese mix of Instagram and Reddit and its users increasingly treat it as a search engine for practical information.

Despite its Little Red Book name, Xiaohongshu has little in common with the compilation of Mao Zedong ’s political writings and speeches. In fact, the app aspires to be a guidebook about anything but politics.

Conceived as a shopping guide for affluent urbanites in 2013, Xiaohongshu has morphed into a one-stop shop for lifestyle and shopping recommendations. Every day, its more than 300 million users, who skew toward educated young women, create, share and search for posts about anything from makeup tutorials to career-development lessons, game strategies or camping skills.

Over the years, Xiaohongshu users have developed a punchy writing style, with posts accompanied by images and videos for an Instagram feel.

Chinese social-media platforms are required to watch political content closely. Xiaohongshu’s focus on lifestyle content, eschewing anything that might seem political, makes it less of a regulatory target than a site like Weibo , which in 2021 was fined at least $2.2 million by China’s cyberspace watchdog for disseminating “illegal information.”

“I don’t expect to read news or discussion of serious issues on Xiaohongshu,” said Lin Ying, a 26-year-old game designer in Beijing.

The American frenzy over a Chinese app is the reverse of a migration in recent years by Chinese social-media users seeking refuge from censorship on Western platforms , such as X, formerly known as Twitter, or, more recently, BlueSky.

Just like TikTok users who turn to the app for fun, Xiaohongshu users also seek entertainment through livestreams and short video clips as well as photos and text-posts on the platform.

Xiaohongshu had roughly 1.3 million U.S. mobile users in December, according to market-intelligence firm Sensor Tower, which estimates that U.S. downloads of the app in the week ending Sunday almost tripled compared with the week before.

Sensor Tower data indicates that Xiaohongshu became the top-ranked social-networking and overall free app on Apple’s App Store and the 8th top-ranked social app on the Google Play Store on Monday, “a feat it has never achieved before,” said Abe Yousef, senior insights analyst at Sensor Tower.

Run by Shanghai-based Xingin Information Technology, Xiaohongshu makes money primarily from advertising, according to a Xiaohongshu spokeswoman. The company was valued at $17 billion after its latest round of private-equity investment in the summer, according to research firm PitchBook Data.

Not everyone is singing kumbaya. Some Chinese Xiaohongshu users are worried about the language barrier. And some American TikTok users are concerned about data safety on the Chinese app.

But many are hoping to build bridges between the two countries.

“Y’all might think Americans are hateful because of how our politicians are, but I promise you not all of us are like that,” one American woman said on a Sunday video she posted on Xiaohongshu with Chinese subtitles.

She went on to show how to make cheese quesadillas using a waffle maker.

The video collected more than 11,000 likes and 3,000 comments within 24 hours. “It’s so kind of you to use Chinese subtitles,” read one popular comment posted by a user from Sichuan province.

Another Guangdong-based user commented with a bilingual “friendly reminder”: “On Chinese social-media platforms please do not mention sensitive topics such as politics, religion and drugs!!!”

Fighting Bushfires Goes High Tech With Laser Drones, Sensors And Satellites

Australia’s fire season looms and researchers are looking to move beyond ‘detecting fires with people in towers and binoculars’.

Chinese users of Xiaohongshu, or Little Red Book, welcome Americans fleeing a feared TikTok ban