From orbit, today’s space-based laser instruments measure Earth’s forests and terrain one narrow line at a time. Between those lines are enormous gaps that include millions of acres of land scientists never directly measure. NASA’s CASALS instrument will blend machine learning with an ultra-compact lidar instrument to adaptively ‘sweep’ large swaths of Earth’s surface. This new capability for space-based remote sensors allows CASALS to create truly three-dimensional (3D) topographical renderings. 

A team of researchers at NASA’s Goddard Space Flight Center (GSFC) has developed a new instrument designed to eliminate blind spots between lines of lidar data on the Earth’s surface. Built with support from NASA’s Earth Science Technology Office (ESTO), the Concurrent Artificially-intelligent Spectrometry Lidar System (CASALS) could help researchers map the features of Earth’s surface with unprecedented detail. Rather than mechanically steering a laser with moving mirrors, CASALS steers light using wavelength itself, generating a continuous, 3D swath of the ground below. 

John Yorks, a physical research scientist at GSFC and Principal Investigator for CASALS, explained that the instrument features a novel transmitter and optical grating system that manipulates laser pulses without heavy, failure-prone motorized mirrors. 

Instead, CASALS uses a fast-pulsing, tunable “seed” laser centered at 1040 nanometers, rapidly cycling through 256 unique wavelengths as it pulses through an optical component with a microscopic pattern of ridges called a transmission grating. 

At this point, the physics of diffraction takes over. Because light bends at slightly different angles depending on its exact wavelength, the grating naturally “steers” each of the 256 pulses into a distinct position across the flight path. 

This non-mechanical approach paints a continuous 3D swath of the ground. Not only does this eliminate the large unmapped gaps left between the isolated tracks of legacy spaceborne lidars, but stripping away moving parts drastically reduces the instrument’s size, weight, and power (SWaP) requirements. This makes it more reliable for the harsh environment of space. 

Another key innovation within CASALS is its detector array. This component features a uniquely high Quantum Efficiency (QE), a variable that describes how effectively a detector converts incoming light (photons) into an electrical signal. CASALS operates at 80% QE. This means CASALS wastes almost none of the light that makes it back to the sensor. 

With QE that high, CASALS can detect much weaker return signals, allowing it to collect useful measurements from darker surfaces or through denser vegetation. 

This technology isn’t limited to a laboratory environment. In November 2024, an airborne CASALS prototype flew aboard NASA’s B200 King Air aircraft. The instrument produced science-quality datasets on its first campaign, exceeding the team’s expectations. 

“I’m very impressed with Guang Yang, Jeffrey Chen, and all our engineers, and how well CASALS performed. This worked really well from the first time we flew it, which is pretty impressive,” said Yorks. 

Flying at an altitude of roughly five kilometers, CASALS can distinguish individual tree branches and subtle changes in ground elevation, thanks to its 22-centimeter horizontal resolution. 

“We’re able to see really fine details of vegetation structure and changes in the topography of the surface,” Yorks said. 

The team aims to fly CASALS again as part of the Airborne Surface, Cryosphere, Ecosystem, and Nearshore Topography (ASCENT) campaign, scheduled for summer 2027. 

But there’s more work to do to prepare the technology for space. The team plans to make several improvements to CASALS before creating a space-ready prototype. Specifically, they’re widening the instrument’s swath and adding onboard data processing software. 

Transitioning from a successful airborne prototype to a fully realized space mission is a challenge, but the CASALS team is up to the task. 

“The team’s really done a great job of sticking together and keeping on task and on schedule. We are being funded to optimize and improve the performance, and we’re also then looking at ways to take the technologies used in the airborne instrument and mature them and prepare them for a spaceborne version in the future,” said Yorks. 

If successful, CASALS could become the first spaceborne lidar capable of mapping Earth’s forests and terrain as continuous three-dimensional swaths rather than isolated profiles, giving scientists a dramatically more complete picture of our changing planet. 

For additional details, see the entry for this project on NASA TechPort. 

Project Lead(s): John Yorks, NASA’s Goddard Space Flight Center 

Sponsoring Organization(s): NASA’s Decadal Survey Incubation (DSI) program; NASA’s Instrument Incubation Program (IIP); NASA’s Goddard Space Flight Center; University of California, Santa Barbara; Virginia Polytechnic Institute and State University 

Explore More

2 min read

Extratropical Cyclone Whips Past Iceland

The powerful low-pressure system formed over the North Atlantic out of the remnants of Hurricane…

Article 10 hours ago

3 min read

Autumn Paints Poland’s Bieszczady Mountains

Fall color covers the forested slopes of Bieszczady National Park, while patches of polonina, a…

Article 2 days ago

6 min read

Fires Arrive in the Amazon Rainforest

During El Niño, a cascade of fires across the tropics begins in equatorial Asia and…

Article 6 days ago

The world’s first demonstration of a subsea geothermal power plant has taken place near an active underwater volcano almost a mile below the ocean surface. It generated less than 10 seconds of net-positive electricity but showed the technical feasibility of tapping another form of renewable energy underwater.

The three-week test deployment of the 3-ton prototype power plant took place at the Axial Seamount in the northeast Pacific Ocean in September. Endurance Energy, the Seattle-based startup behind the effort, aims to eventually commercialize subsea geothermal power for Pacific island nations and other customers looking for alternatives to importing expensive fossil fuels.

“The deep ocean gives us unlimited cold seawater for cooling, and its weight keeps the system and the well pressurized, so our plants can be compact,” said Andrew Redd, founder and CEO of Endurance Energy, in an email to Ars.

Read full article

Comments

Environmental change is being measured in forests cleared, crops stressed and species pushed from their habitats. But the response is also being shaped by decisions about money, land and technology, and by people trying to protect both livelihoods and the places they depend on.

Brazil’s latest figures offer one of the clearest signs of progress: forest clearing in the Amazon fell to 3,335 square kilometers in the year ending July 31, 2026, 42% below the previous year and the lowest level since records began in 1988. The Cerrado also saw a decline. The drop comes ahead of a presidential run-off in which the rainforest’s future is a key issue. Whether the reduction lasts remains uncertain.

Elsewhere, the costs of adapting to environmental pressures are immediate. Drought has left England’s pumpkins smaller than usual, with growers warning the crop could be the worst on record. In Southern California, wildfires have damaged or destroyed six homes, while a firefighter suffered heat exhaustion. And in the UK, proposals to cut hundreds of millions of pounds from the heat pump grant scheme could affect support for households switching from gas, oil or LPG boilers.

These stories sit alongside questions about what governments choose to prioritize. US voters in battleground states want candidates to discuss climate change, but candidates have largely stayed quiet. In Britain, Chancellor John Healey has made a growth case for Heathrow’s proposed third runway, while the prime minister has not backed the project. The government is studying consultation responses. The choices are practical as well as political: how to cut emissions, where to direct public funds and whose concerns shape decisions.

On the ground, communities are building their own responses. In Sergipe, women shellfish gatherers are resisting mangrove degradation and fighting for access to the areas where they work. In coastal Indonesia, Wisye Sahambangung leads a women’s group restoring mangroves and creating economic opportunities. Their work connects habitat protection with income and access to natural resources.

Other reports show how easily conservation efforts can create new pressures. Researchers found fewer wild pollinators in areas with higher concentrations of honeybees, which were observed bumping into or chasing other pollinators from flowers. The finding complicates the idea that more beekeeping automatically helps pollinators. In western states, efforts to reduce wolf numbers raise questions about the animals’ social lives and their role in nature. Meanwhile, countries are falling short of pledged funding and ocean-protection goals ahead of the UN biodiversity conference, COP17.

Technology and spectacle bring their own questions. Starlink’s reported restrictions in Ukraine have prompted US senators to seek an investigation into who imposed them, while the service remains important to Ukraine’s wartime operations. At a different scale, Belfast Harbour is to test zero-emission transport and energy systems with £15m in funding.

The Exmoor Dark Skies Festival, with about 80 events planned, offers another way people encounter the natural world: through walks, astronomy sessions and moonlit swims. The weeks ahead will show whether policy commitments match the scale of environmental pressures, and whether local efforts can endure with the resources and access they need.

The post California Wildfires Damage Homes, Exmoor Dark Skies Festival Marks a Decade — Today’s Environmental Briefing for Sat, Oct 17 2026 first appeared on EnviroLink Network.