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Return of the GEDI

28 April 2023
Since 2018, the GEDI mission has been firing lasers from the International Space Station to measure aboveground biomass on Earth.
• The information gleaned from it has been crucial for scientists to understand how deforestation contributes to worsening climate change.
• The mission was supposed to be decommissioned earlier this year, with the lasers fated to be jettisoned from the ISS and burned up in the atmosphere.
• However, NASA made a last-minute decision to extend the mission after a push from the scientists involved in it: the GEDI equipment will be put into storage for 18 months, then reinstated to resume operations for as long as the ISS continues to run.

It was down to the wire for the GEDI mission, but it now seems like the force may have prevailed.

In a last-minute decision, NASA has decided to extend the GEDI mission (short for Global Ecosystem Dynamics Investigation, and pronounced “Jedi” like in the Star Wars films), which was fated to be jettisoned from the International Space Station, where it has been attached for the past four years, to make way for another, unrelated, mission. But a campaign driven by the scientists involved in the project helped the mission — the first to map Earth’s forests in 3D — get a second life.

NASA now says the mission will take a hiatus for 18 months. The array of lasers that make up the GEDI equipment will be moved into storage on board the ISS, where space for research equipment is at a premium, to make way for a U.S. Department of Defence payload.

“The proposed solution calls for temporarily moving GEDI to an alternate location, where it will remain offline for about 18 months while a DOD technology payload completes its mission,” NASA said in a statement issued March 17. “In 2024, GEDI will return to its original location and resume operations on the station.” The mission is now expected to “continue through the life of the space station,” which is set to be retired in 2031.

Data from the GEDI mission, operating since 2018, has been critical for scientists to understand how deforestation is exacerbating climate change.

“This mission is particularly valuable, especially at the point where we are in now, in terms of climate negotiations and the recognition of mitigation efforts,” Scott Goetz, deputy principal investigator at the GEDI mission and a professor at Northern Arizona University, told Mongabay in a video interview. “It means a lot to me and my group, but it means a lot more for the broader scientific community as well.”

The GEDI mission uses spaceborne laser altimeters to measure the aboveground biomass on Earth. Scientists calculate the dimensions of trees based on the time it takes for the light emitted from the ISS to hit the tree and reflect back. Since the light also reflects off leaves and branches, the GEDI mission has also helped scientists get a fuller understanding of what a tree looks like, including details about girth, weight and canopy size.

Modelling forests in 3D is imperative to estimate the amount of carbon stored in them. About half of a tree’s dry weight comprises carbon, which is released into the atmosphere when it’s cut down or is burned up in a fire. When scientists and researchers can calculate the amount of carbon stored in an area of forest, it gives them a clear picture of how the carbon is distributed and how much is released due to deforestation.

Since GEDI data became publicly available in 2020, researchers and governments have been using it for a variety of applications.

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Source: Mongabay.com

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